def buildWCS(self, config, base):
"""Build a local WCS from the given location in a DES focal plane, given a directory
with the image files. By default, it will pick a random chipnum and image position,
but these can be optionally specified.
"""
req = {
"dir":
str, # The directory with the files. We'll use 'des_data' here.
"root":
str, # The root name of the files. We'll use 'DECam_00154912' here.
}
opt = {
"chipnum":
int, # Which chip to use: 1-62. Default is to pick a random chip.
"image_pos":
galsim.PositionD, # The position in the chip. Default is random.
"ext": str, # The file extension. Default is ".fits.fz"
"bad_ccds":
list, # A list of ccds to skip. Default is default_bad_ccds.
}
params, safe = galsim.config.GetAllParams(config,
base,
req=req,
opt=opt)
# These will already have been checked to be present, since they are in the req dict.
dir = params['dir']
root = params['root']
rng = base['rng']
ud = galsim.UniformDeviate(
rng) # Will give float values between 0 and 1.
if 'chipnum' in params:
chipnum = params['chipnum']
else:
bad_ccds = params.get('bad_ccds', default_bad_ccds)
chipnum = get_random_chipnum(ud, bad_ccds)
ext = params.get('ext', '.fits.fz')
# Build the full path of the file to use.
file_name = os.path.join(dir, "%s_%02d%s" % (root, chipnum, ext))
# Read the full WCS as a regular FitsWCS.
full_wcs = galsim.FitsWCS(file_name)
# Determine where in the image we will get the local WCS
if 'image_pos' in params:
image_pos = params['image_pos']
else:
x = ud(
) * 2048. + 0.5 # The pixel centers go from 1-2048, so edges are 0.5-2048.5
y = ud() * 4096. + 0.5
image_pos = galsim.PositionD(x, y)
# Finally, return the local wcs at this location.
local_wcs = full_wcs.local(image_pos)
return local_wcs
def __init__(self, dir, root, ext='.fits.fz'):
# Read all the wcs objects indexed by their chipnum
self.all_wcs = {}
for chipnum in range(1, 63):
file_name = os.path.join(dir, "%s_%02d%s" % (root, chipnum, ext))
wcs = galsim.FitsWCS(file_name)
self.all_wcs[chipnum] = wcs
def __init__(self, dir, root, ext='.fits.fz', bad_ccds=default_bad_ccds):
self.bad_ccds = bad_ccds
# Read all the wcs objects indexed by their chipnum
self.all_wcs = {}
for chipnum in range(1,63):
# skip bad ccds
if chipnum not in bad_ccds:
file_name = os.path.join(dir, "%s_%02d%s"%(root,chipnum,ext))
wcs = galsim.FitsWCS(file_name)
self.all_wcs[chipnum] = wcs
def __init__(self, dir, root, ext='.fits.fz'):
# Read all the wcs objects indexed by their chipnum
self.all_wcs = {}
for chipnum in range(1,63):
file_name = os.path.join(dir, "%s_%02d%s"%(root,chipnum,ext))
try:
wcs = galsim.FitsWCS(file_name)
except:
continue
self.all_wcs[chipnum] = wcs
if len(self.all_wcs) == 0:
raise RuntimeError("All input wcs files were missing or failed to load.")
def setup(self):
self.object_mask = np.loadtxt("/home/samuroff/mask_template.txt")
# WCS
wcs_path = "/share/des/disc2/y1/OPS/coadd/20141118000051_DES0014-4414/coadd/DES0014-4414_r.fits.fz"
orig_col = 1000
orig_row = 1000
image_pos = galsim.PositionD(orig_col, orig_row)
self.wcs = galsim.FitsWCS(wcs_path)
# im3shape config
self.opt = p3s.Options(
"/home/samuroff/shear_pipeline/end-to-end/end-to-end_code/config_files/im3shape/params_disc.ini"
)
def analyse1(self,
central_ellipticity,
dneigh=20,
central_flux=1912.0,
psf_size=3.7,
neighbour_flux=1912.0,
neighbour_size=3.2):
# Level 1 - loop over SNR
#-----------------------------------------------------------------------
self.m = {}
self.m[1] = []
self.m[2] = []
self.snr = []
self.dneigh = 20
self.central_flux = 1912.0
self.psf_size = 3.7
self.neighbour_flux = 1912.0
self.neighbour_size = 3.2
print "Toy model has a central galaxy with shape ", central_ellipticity
self.e1 = central_ellipticity[0]
self.e2 = central_ellipticity[1]
# Setup a dummy wcs
# We load it here to avoid too much unncessary io
# In fact it should provide a skeleton only, since we overwrite the Jacobian with an identity matrix
wcs_path = "/share/des/disc2/y1/OPS/coadd/20141118000051_DES0014-4414/coadd/DES0014-4414_r.fits.fz"
orig_col = 1000
orig_row = 1000
image_pos = galsim.PositionD(orig_col, orig_row)
self.wcs = galsim.FitsWCS(wcs_path)
self.opt = p3s.Options(
"/home/samuroff/shear_pipeline/end-to-end/end-to-end_code/config_files/im3shape/params_disc.ini"
)
self.binning = np.logspace(1, 3.5, 12)
# Cycle over the central flux, as a proxy for SNR
for i, proxy in enumerate(self.binning):
print "Level 1 iteration: %d %f" % (i, proxy)
self.do_position_loop(proxy)
print "Done all loops"
def get_wcs(self, iobj, iexp): wcs_path = self.get_source_path(iobj, iexp) wcs_path = check_wcs(wcs_path) orig_col = self['orig_col'][iobj][iexp] orig_row = self['orig_row'][iobj][iexp] image_pos = galsim.PositionD(orig_col,orig_row) wcs = galsim.FitsWCS(wcs_path) ix = int(math.floor(image_pos.x )) iy = int(math.floor(image_pos.y )) # Offset of the galaxy centroid from the stamp centre offset = (image_pos - galsim.PositionD(ix,iy)) offset= galsim.PositionD(offset.x+0.5, offset.y+0.5) return wcs.local(image_pos), offset
def __init__(self, file_name, image_file_name=None, wcs=None, dir=None):
if dir:
if not isinstance(file_name, basestring):
raise ValueError("Cannot provide dir and an HDU instance")
import os
file_name = os.path.join(dir, file_name)
if image_file_name is not None:
image_file_name = os.path.join(dir, image_file_name)
self.file_name = file_name
if image_file_name:
if wcs is not None:
raise AttributeError(
"Cannot provide both image_file_name and wcs")
self.wcs = galsim.FitsWCS(image_file_name)
elif wcs:
self.wcs = wcs
else:
self.wcs = None
self.read()
def get_galsim_wcs(*, image_path, image_ext):
"""Read the WCS solution of an image into a galsim WCS object.
Parameters
----------
image_path : str
The path to the image.
image_ext : int or str
The extension with the WCS information.
Returns
-------
wcs : galsim WCS
The WCS object.
"""
hd = fitsio.read_header(
image_path, ext=image_ext)
hd = {k.upper(): hd[k] for k in hd if k is not None}
wcs = galsim.FitsWCS(header=hd)
assert not isinstance(wcs, galsim.PixelScale) # this has been a problem
return wcs
def get_fixed_gaussian_psf(options, psf_size, psf_e1, psf_e2, wcs=None):
"This is slow - for test runs only."
import galsim
psf_box = (options.stamp_size + options.padding) * options.upsampling
#Get the localized WCS information
if wcs is None:
wcs_path = "/share/des/disc2/y1/OPS/coadd/20141118000051_DES0014-4414/coadd/DES0014-4414_r.fits.fz"
wcs = galsim.FitsWCS(wcs_path)
orig_col = 1000
orig_row = 1000
image_pos = galsim.PositionD(orig_col, orig_row)
local_wcs = wcs.local(image_pos)
local_wcs._dudx = 1.0 / options.upsampling
local_wcs._dudy = 0.0 / options.upsampling
local_wcs._dvdx = 0.0 / options.upsampling
local_wcs._dvdy = 1.0 / options.upsampling
A = np.array([[local_wcs._dudx, local_wcs._dudy],
[local_wcs._dvdx, local_wcs._dvdy]])
local_wcs._det = np.linalg.det(A)
#Generate the PSF in sky coordinates
pix = wcs.toWorld(galsim.Pixel(0.27), image_pos=image_pos)
psf_sky = galsim.Convolve([galsim.Gaussian(fwhm=psf_size), pix])
psf_sky = galsim.Gaussian(fwhm=psf_size)
pshear = galsim.Shear(g1=psf_e1, g2=psf_e2)
psf_sky = psf_sky.shear(pshear)
psf_stamp = psf_sky.drawImage(wcs=local_wcs,
nx=psf_box,
ny=psf_box,
method='no_pixel')
psf_stamp_array = psf_stamp.array.copy()
assert psf_stamp_array.shape == (psf_box, psf_box)
return psf_sky, psf_stamp.array.copy()
def skip_roman_wcs():
"""Test the Roman WCS routines against ones provided by the Roman project office.
"""
# This test is out of date and is not run, but since it was a useful test, the code is kept here
# as a reminder to reinstate it if/when we get an updated version of the WCS software from the
# Roman project office for cycle 7+. Everything below this comment is the original code from
# GalSim v1.4.
######################################################################################3
# The standard against which we will compare is the output of some software provided by Jeff
# Kruk. The files used here were generated by Rachel on her Macbook using the script in
# roman_files/make_standards.sh, and none of the parameters below can be changed without
# modifying and rerunning that script. We use 4 sky positions and rotation angles (2 defined
# using the focal plane array, 2 using the observatory coordinates), and in each case, use a
# different SCA for our tests. We will simply read in the stored WCS and generate new ones, and
# check that they have the right value of SCA center and pixel scale at the center, and that if
# we offset by 500 pixels in some direction that gives the same sky position in each case.
ra_test = [127., 307.4, -61.52, 0.0]
dec_test = [-70., 50., 22.7, 0.0]
pa_test = [160., 79., 23.4, -3.1]
sca_test = [2, 13, 7, 18]
import datetime
ve = datetime.datetime(2025, 3, 20, 9, 2, 0)
date_test = [ve, ve, ve, datetime.date(2025, 6, 20)]
pa_is_fpa_test = [True, False, True, False]
dist_arcsec = []
dist_2_arcsec = []
pix_area_ratio = []
for i_test in range(len(ra_test)):
# Make the WCS for this test.
world_pos = galsim.CelestialCoord(ra_test[i_test] * galsim.degrees,
dec_test[i_test] * galsim.degrees)
if i_test == 0:
# Just for this case, we want to get the WCS for all SCAs. This will enable some
# additional tests that we don't do for the other test case.
gs_wcs_dict = galsim.roman.getWCS(PA=pa_test[i_test] *
galsim.degrees,
world_pos=world_pos,
PA_is_FPA=pa_is_fpa_test[i_test],
date=date_test[i_test])
np.testing.assert_equal(
len(gs_wcs_dict),
galsim.roman.n_sca,
err_msg='WCS dict has wrong length: %d vs. %d' %
(len(gs_wcs_dict), galsim.roman.n_sca))
else:
# Use the SCAs keyword to just get the WCS for the SCA that we want.
gs_wcs_dict = galsim.roman.getWCS(PA=pa_test[i_test] *
galsim.degrees,
world_pos=world_pos,
PA_is_FPA=pa_is_fpa_test[i_test],
SCAs=sca_test[i_test],
date=date_test[i_test])
np.testing.assert_equal(
len(gs_wcs_dict),
1,
err_msg='WCS dict has wrong length: %d vs. %d' %
(len(gs_wcs_dict), 1))
# Read in reference.
test_file = 'test%d_sca_%02d.fits' % (i_test + 1, sca_test[i_test])
ref_wcs = galsim.FitsWCS(os.path.join('roman_files', test_file))
gs_wcs = gs_wcs_dict[sca_test[i_test]]
# Check center position:
im_cent_pos = galsim.PositionD(galsim.roman.n_pix / 2.,
galsim.roman.n_pix / 2)
ref_cent_pos = ref_wcs.toWorld(im_cent_pos)
gs_cent_pos = gs_wcs.toWorld(im_cent_pos)
dist_arcsec.append(
ref_cent_pos.distanceTo(gs_cent_pos) / galsim.arcsec)
# Check pixel area
rat = ref_wcs.pixelArea(image_pos=im_cent_pos) / gs_wcs.pixelArea(
image_pos=im_cent_pos)
pix_area_ratio.append(rat - 1.)
# Check another position, just in case rotations are messed up.
im_other_pos = galsim.PositionD(im_cent_pos.x + 500.,
im_cent_pos.y - 200.)
ref_other_pos = ref_wcs.toWorld(im_other_pos)
gs_other_pos = gs_wcs.toWorld(im_other_pos)
dist_2_arcsec.append(
ref_other_pos.distanceTo(gs_other_pos) / galsim.arcsec)
if i_test == 0:
# For just one of our tests cases, we'll do some additional tests. These will target
# the findSCA() functionality. First, we'll choose an SCA and check that its center is
# found to be in that SCA.
found_sca = galsim.roman.findSCA(gs_wcs_dict, gs_cent_pos)
np.testing.assert_equal(
found_sca,
sca_test[i_test],
err_msg='Did not find SCA center position to be on that SCA!')
# Then, we go to a place that should be off the side by a tiny bit, and check that it is
# NOT on an SCA if we exclude borders, but IS on the SCA if we include borders.
im_off_edge_pos = galsim.PositionD(-2., galsim.roman.n_pix / 2.)
world_off_edge_pos = gs_wcs.toWorld(im_off_edge_pos)
found_sca = galsim.roman.findSCA(gs_wcs_dict, world_off_edge_pos)
assert found_sca is None
found_sca = galsim.roman.findSCA(gs_wcs_dict,
world_off_edge_pos,
include_border=True)
np.testing.assert_equal(
found_sca,
sca_test[i_test],
err_msg='Did not find slightly off-edge position on the SCA'
' when including borders!')
np.testing.assert_array_less(
np.array(dist_arcsec),
np.ones(len(ra_test)) * galsim.roman.pixel_scale / 100,
err_msg=
'For at least one WCS, center offset from reference was > 0.01(pixel scale).'
)
np.testing.assert_array_less(
np.array(dist_2_arcsec),
np.ones(len(ra_test)) * galsim.roman.pixel_scale / 100,
err_msg=
'For at least one WCS, other offset from reference was > 0.01(pixel scale).'
)
np.testing.assert_array_less(
np.array(pix_area_ratio),
np.ones(len(ra_test)) * 0.0001,
err_msg=
'For at least one WCS, pixel areas differ from reference by >0.01%.')
def simImage(sourceDir,imFile,catFile,psfFile,outFile):
"""
Create a simulated image using PSFEx modelled PSFs and noise properties of the source image
Input: sourceDir: input directory data
imFile: imput image file name
catFile: catalogue file (output from SeXtractor)
psfFile: psf model (output from PSFEx)
outFile: name of output file for image
Output: writes to fits file.
The catFile must contain the fields X_IMAGE, Y_IMAGE, FLUX_APER (or the code to
be changed to equivalent for positions of sources and integrated flux).
"""
#load necessary stuff from files.
#NOte that the MCS image files have two HDUs, one with
#the WCS information, one with the image information.
galHdr1 = galsim.FitsHeader(imFile, dir=sourceDir, hdu=0)
galHdr2 = galsim.FitsHeader(imFile, dir=sourceDir, hdu=1)
cat = galsim.Catalog(catFile, hdu=2, dir=sourceDir, file_type="FITS")
psfex=des.DES_PSFEx(psfFile,imFile,dir=sourceDir)
image=galsim.fits.read(imFile,sourceDir,hdu=1)
#get setup the image. match the (currently trivial) WCS with the image, and
#create a blank image
wcs = galsim.FitsWCS(header=galHdr1)
xSize=galHdr2['NAXIS1']
ySize=galHdr2['NAXIS2']
simImage = galsim.Image(xSize, ySize, wcs=wcs)
#some definitions for extracting catalogue columsn
xCol="X_IMAGE"
yCol="Y_IMAGE"
fluxCol="FLUX_APER"
#get noise statistics. Read in the catalogue positions to estimate the centre
#of the image in whatever rotation it has. This is so we get the noise statistics
#from teh mask region, excludin the rest of the image.
xVals=cat.data[xCol]
yVals=cat.data[yCol]
xMean=int(xVals.mean())
yMean=int(yVals.mean())
radius=1800
subIm=image.array[int(xMean-radius):int(xMean+radius),int(yMean-radius):int(yMean+radius)]
im,a,b=sigmaclip(subIm.ravel(),5,5)
skyLevel=im.mean()
skySigma=im.std()
gain = skyLevel / skySigma**2 #this definition from teh galsim tutorials
nobj = cat.nobjects
print('Catalog has ',nobj,' objects. Sky level is ',int(skyLevel),' Sky sigma is ',int(skySigma))
#now cycle over the catalogue.
for k in range(nobj):
#get position and flux
x = cat.getFloat(k,xCol)
y = cat.getFloat(k,yCol)
flux = cat.getFloat(k,fluxCol)*5
#some position calculation for the galsim routines
# + 0.5 to account for even-size postage stamps
x=x+0.5
y=y+0.5
ix = int(math.floor(x+0.5))
iy = int(math.floor(y+0.5))
dx = x-ix
dy = y-iy
imagePos = galsim.PositionD(x,y)
offset = galsim.PositionD(dx,dy)
#calculate PSF for given position and flux
psf=psfex.getPSF(imagePos).withFlux(flux)
#make image
stamp = psf.drawImage(wcs=wcs.local(imagePos), offset=offset, method='no_pixel')
stamp.setCenter(ix,iy)
#and place on image, taking into consideration edges
bounds = stamp.bounds & simImage.bounds
simImage[bounds] += stamp[bounds]
#now that we've done all the spots, add noise
#background sky level
simImage += skyLevel
#CCD noise
random_seed = 1339201
rng=galsim.BaseDeviate(random_seed)
noise = galsim.CCDNoise(rng, gain=gain)
#poisonnian noise
simImage.addNoise(noise)
noise = galsim.PoissonNoise(rng, sky_level=skyLevel)
simImage.addNoise(noise)
#and dump to a file. Will overwrite existing file.
simImage.write(outFile,clobber=True)
def test_flat():
"""Test building a flat field image using the Silicon class.
"""
# Note: This test is based on a script devel/lsst/treering_flat.py
if __name__ == '__main__':
nx = 200
ny = 200
nflats = 20
niter = 50
toler = 0.01
else:
nx = 50
ny = 50
nflats = 3
niter = 20 # Seem to really need 20 or more iterations to get covariances close.
toler = 0.05
counts_total = 80.e3
counts_per_iter = counts_total / niter
# Silicon sensor with tree rings
seed = 31415
rng = galsim.UniformDeviate(seed)
treering_func = galsim.SiliconSensor.simple_treerings(0.26, 47)
treering_center = galsim.PositionD(0,0)
sensor = galsim.SiliconSensor(rng=rng,
treering_func=treering_func, treering_center=treering_center)
# Use a non-trivial WCS to make sure that works properly.
wcs = galsim.FitsWCS('fits_files/tnx.fits')
# We add on a border of 2 pixels, since the outer row/col get a little messed up by photons
# falling off the edge, but not coming on from the other direction.
# We do 2 rows/cols rather than just 1 to be safe, since I think diffusion can probably go
# 2 pixels, even though the deficit is only really evident on the outer pixel.
nborder = 2
base_image = galsim.ImageF(nx+2*nborder, ny+2*nborder, wcs=wcs)
base_image.wcs.makeSkyImage(base_image, sky_level=1.)
# Rescale so that the mean sky level per pixel is skyCounts
mean_pixel_area = base_image.array.mean()
sky_level_per_iter = counts_per_iter / mean_pixel_area # in ADU/arcsec^2 now.
base_image *= sky_level_per_iter
# The base_image now has the right level to account for the WCS distortion, but not any sensor
# effects.
# This is the noise-free level that we want to add each iteration modulated by the sensor.
noise = galsim.PoissonNoise(rng)
flats = []
for n in range(nflats):
print('n = ',n)
# image is the image that we will build up in steps.
image = galsim.ImageF(nx+2*nborder, ny+2*nborder, wcs=wcs)
for i in range(niter):
# temp is the additional flux we will add to the image in this iteration.
# Start with the right area due to the sensor effects.
temp = sensor.calculate_pixel_areas(image)
temp /= temp.array.mean()
# Multiply by the base image to get the right mean level and wcs effects
temp *= base_image
# Finally, add noise. What we have here so far is the expectation value in each pixel.
# We need to realize this according to Poisson statistics with these means.
temp.addNoise(noise)
# Add this to the image we are building up.
image += temp
# Cut off the outer border where things don't work quite right.
image = image.subImage(galsim.BoundsI(1+nborder,nx+nborder,1+nborder,ny+nborder))
flats.append(image.array)
# These are somewhat noisy, so compute for all pairs and average them.
mean = var = cov01 = cov10 = cov11a = cov11b = cov02 = cov20 = 0
n = len(flats)
npairs = 0
for i in range(n):
flati = flats[i]
print('mean ',i,' = ',flati.mean())
mean += flati.mean()
for j in range(i+1,n):
flatj = flats[j]
diff = flati - flatj
var += diff.var()/2
cov01 += np.mean(diff[1:,:] * diff[:-1,:])
cov10 += np.mean(diff[:,1:] * diff[:,:-1])
cov11a += np.mean(diff[1:,1:] * diff[:-1,:-1])
cov11b += np.mean(diff[1:,:-1] * diff[:-1,1:])
cov02 += np.mean(diff[2:,:] * diff[:-2,:])
cov20 += np.mean(diff[:,2:] * diff[:,:-2])
npairs += 1
mean /= n
var /= npairs
cov01 /= npairs
cov10 /= npairs
cov11a /= npairs
cov11b /= npairs
cov02 /= npairs
cov20 /= npairs
print('var(diff)/2 = ',var, 0.93*counts_total)
print('cov01 = ',cov01, 0.03*counts_total) # Note: I don't actually know if these are
print('cov10 = ',cov10, 0.015*counts_total) # the right covariances...
print('cov11a = ',cov11a, cov11a/counts_total)
print('cov11b = ',cov11b, cov11b/counts_total)
print('cov02 = ',cov02, cov02/counts_total)
print('cov20 = ',cov20, cov20/counts_total)
# Mean should be close to target counts
np.testing.assert_allclose(mean, counts_total, rtol=toler)
# Variance is a bit less than the mean due to B/F.
np.testing.assert_allclose(var, 0.93 * counts_total, rtol=toler)
# 01 and 10 covariances are significant.
np.testing.assert_allclose(cov01, 0.03 * counts_total, rtol=30*toler)
np.testing.assert_allclose(cov10, 0.015 * counts_total, rtol=60*toler)
# The rest are small
np.testing.assert_allclose(cov11a / counts_total, 0., atol=2*toler)
np.testing.assert_allclose(cov11b / counts_total, 0., atol=2*toler)
np.testing.assert_allclose(cov20 / counts_total, 0., atol=2*toler)
np.testing.assert_allclose(cov02 / counts_total, 0., atol=2*toler)
def main():
pr = cProfile.Profile()
pr.enable()
rng = galsim.UniformDeviate(8675309)
wcs = galsim.FitsWCS('../tests/des_data/DECam_00154912_12_header.fits')
image = galsim.Image(xsize, ysize, wcs=wcs)
bandpass = galsim.Bandpass('LSST_r.dat', wave_type='nm').thin(0.1)
base_wavelength = bandpass.effective_wavelength
angles = galsim.FRatioAngles(fratio, obscuration, rng)
sensor = galsim.SiliconSensor(rng=rng, nrecalc=nrecalc)
# Figure out the local_sidereal time from the observation location and time.
lsst_lat = '-30:14:23.76'
lsst_long = '-70:44:34.67'
obs_time = '2012-11-24 03:37:25.023964' # From the header of the wcs file
obs = astropy.time.Time(obs_time, scale='utc', location=(lsst_long + 'd', lsst_lat + 'd'))
local_sidereal_time = obs.sidereal_time('apparent').value
# Convert the ones we need below to galsim Angles.
local_sidereal_time *= galsim.hours
lsst_lat = galsim.Angle.from_dms(lsst_lat)
times = []
mem = []
phot = []
t0 = time.clock()
for iobj in range(nobjects):
sys.stderr.write('.')
psf = make_psf(rng)
gal = make_gal(rng)
obj = galsim.Convolve(psf, gal)
sed = get_sed(rng)
waves = galsim.WavelengthSampler(sed=sed, bandpass=bandpass, rng=rng)
image_pos = get_pos(rng)
sky_coord = wcs.toWorld(image_pos)
bounds, offset = calculate_bounds(obj, image_pos, image)
ha = local_sidereal_time - sky_coord.ra
dcr = galsim.PhotonDCR(base_wavelength=base_wavelength,
obj_coord=sky_coord, HA=ha, latitude=lsst_lat)
surface_ops = (waves, angles, dcr)
obj.drawImage(method='phot', image=image[bounds], offset=offset,
rng=rng, sensor=sensor,
surface_ops=surface_ops)
times.append(time.clock() - t0)
mem.append(resource.getrusage(resource.RUSAGE_SELF).ru_maxrss)
phot.append(obj.flux)
image.write('phot.fits')
phot = np.cumsum(phot)
make_plots(times, mem, phot)
pr.disable()
ps = pstats.Stats(pr).sort_stats('time')
ps.print_stats(20)
def test_meds():
"""
Create two objects, each with three exposures. Save them to a MEDS file.
Load the MEDS file. Compare the created objects with the one read by MEDS.
"""
# initialise empty MultiExposureObject list
objlist = []
# we will be using 2 objects for testing, each with 3 cutouts
n_obj_test = 2
n_cut_test = 3
# set the image size
box_size = 32
# first obj
img11 = galsim.Image(box_size, box_size, init_value=111)
img12 = galsim.Image(box_size, box_size, init_value=112)
img13 = galsim.Image(box_size, box_size, init_value=113)
seg11 = galsim.Image(box_size, box_size, init_value=121)
seg12 = galsim.Image(box_size, box_size, init_value=122)
seg13 = galsim.Image(box_size, box_size, init_value=123)
wth11 = galsim.Image(box_size, box_size, init_value=131)
wth12 = galsim.Image(box_size, box_size, init_value=132)
wth13 = galsim.Image(box_size, box_size, init_value=133)
psf11 = galsim.Image(box_size, box_size, init_value=141)
psf12 = galsim.Image(box_size, box_size, init_value=142)
psf13 = galsim.Image(box_size, box_size, init_value=143)
dudx = 11.1
dudy = 11.2
dvdx = 11.3
dvdy = 11.4
x0 = 11.5
y0 = 11.6
wcs11 = galsim.AffineTransform(dudx, dudy, dvdx, dvdy,
galsim.PositionD(x0, y0))
dudx = 12.1
dudy = 12.2
dvdx = 12.3
dvdy = 12.4
wcs12 = galsim.JacobianWCS(dudx, dudy, dvdx, dvdy)
wcs13 = galsim.PixelScale(13)
# create lists
images = [img11, img12, img13]
weight = [wth11, wth12, wth13]
seg = [seg11, seg12, seg13]
psf = [psf11, psf12, psf13]
wcs = [wcs11, wcs12, wcs13]
# create object
obj1 = galsim.des.MultiExposureObject(images=images,
weight=weight,
seg=seg,
psf=psf,
wcs=wcs,
id=1)
# second obj
img21 = galsim.Image(box_size, box_size, init_value=211)
img22 = galsim.Image(box_size, box_size, init_value=212)
img23 = galsim.Image(box_size, box_size, init_value=213)
seg21 = galsim.Image(box_size, box_size, init_value=221)
seg22 = galsim.Image(box_size, box_size, init_value=222)
seg23 = galsim.Image(box_size, box_size, init_value=223)
wth21 = galsim.Image(box_size, box_size, init_value=231)
wth22 = galsim.Image(box_size, box_size, init_value=332)
wth23 = galsim.Image(box_size, box_size, init_value=333)
psf21 = galsim.Image(box_size, box_size, init_value=241)
psf22 = galsim.Image(box_size, box_size, init_value=342)
psf23 = galsim.Image(box_size, box_size, init_value=343)
dudx = 21.1
dudy = 21.2
dvdx = 21.3
dvdy = 21.4
x0 = 21.5
y0 = 21.6
wcs21 = galsim.AffineTransform(dudx, dudy, dvdx, dvdy,
galsim.PositionD(x0, y0))
dudx = 22.1
dudy = 22.2
dvdx = 22.3
dvdy = 22.4
wcs22 = galsim.JacobianWCS(dudx, dudy, dvdx, dvdy)
wcs23 = galsim.PixelScale(23)
# create lists
images = [img21, img22, img23]
weight = [wth21, wth22, wth23]
seg = [seg21, seg22, seg23]
psf = [psf21, psf22, psf23]
wcs = [wcs21, wcs22, wcs23]
# create object
# This time put the wcs in the image and get it there.
img21.wcs = wcs21
img22.wcs = wcs22
img23.wcs = wcs23
obj2 = galsim.des.MultiExposureObject(images=images,
weight=weight,
seg=seg,
psf=psf,
id=2)
obj3 = galsim.des.MultiExposureObject(images=images, id=3)
# create an object list
objlist = [obj1, obj2]
# save objects to MEDS file
filename_meds = 'output/test_meds.fits'
galsim.des.WriteMEDS(objlist, filename_meds, clobber=True)
bad1 = galsim.Image(32, 48, init_value=0)
bad2 = galsim.Image(35, 35, init_value=0)
bad3 = galsim.Image(48, 48, init_value=0)
with assert_raises(TypeError):
galsim.des.MultiExposureObject(images=img11)
with assert_raises(galsim.GalSimValueError):
galsim.des.MultiExposureObject(images=[])
with assert_raises(galsim.GalSimValueError):
galsim.des.MultiExposureObject(images=[bad1])
with assert_raises(galsim.GalSimValueError):
galsim.des.MultiExposureObject(images=[bad2])
with assert_raises(galsim.GalSimValueError):
galsim.des.MultiExposureObject(images=[img11, bad3])
with assert_raises(TypeError):
galsim.des.MultiExposureObject(images=images, weight=wth11)
with assert_raises(galsim.GalSimValueError):
galsim.des.MultiExposureObject(images=images, weight=[])
with assert_raises(galsim.GalSimValueError):
galsim.des.MultiExposureObject(images=[img11], weight=[bad3])
with assert_raises(galsim.GalSimValueError):
galsim.des.MultiExposureObject(images=[img11], psf=[bad1])
with assert_raises(galsim.GalSimValueError):
galsim.des.MultiExposureObject(images=[img11], psf=[bad2])
with assert_raises(galsim.GalSimValueError):
galsim.des.MultiExposureObject(images=[img11, img12],
psf=[bad2, psf12])
with assert_raises(TypeError):
galsim.des.MultiExposureObject(images=images, wcs=wcs11)
celestial_wcs = galsim.FitsWCS("DECam_00154912_12_header.fits",
dir='des_data')
with assert_raises(galsim.GalSimValueError):
galsim.des.MultiExposureObject(images=[img11], wcs=[celestial_wcs])
# Check the one with no psf, weight, etc.
filename_meds2 = 'output/test_meds_image_only.fits'
galsim.des.WriteMEDS([obj3], filename_meds2, clobber=True)
# Note that while there are no tests prior to this, the above still checks for
# syntax errors in the meds creation software, so it's still worth running as part
# of the normal unit tests.
# But for the rest of the tests, we'll use the meds module to make sure our code
# stays in sync with any changes there.
try:
import meds
# Meds will import this, so check for this too.
import fitsio
except ImportError:
print(
'Failed to import either meds or fitsio. Unable to do tests of meds file.'
)
return
# Run meds module's validate function
try:
meds.util.validate_meds(filename_meds)
meds.util.validate_meds(filename_meds2)
except AttributeError:
print(
'Seems to be the wrong meds package. Unable to do tests of meds file.'
)
return
m = meds.MEDS(filename_meds)
# Check the image_info extension:
ref_info = meds.util.get_image_info_dtype(1)
info = m.get_image_info()
print('info = ', info)
for name, dt in ref_info:
dt = numpy.dtype(dt)
print(name, dt, info.dtype[name], dt.char, info.dtype[name].char)
assert name in info.dtype.names, "column %s not present in image_info extension" % name
# I think S and U for this purpose are equivalent.
# But I'm finding S in the reference, and U in info.
c = info.dtype[name].char
c = 'S' if c == 'U' else c
assert dt.char == c, "column %s is the wrong type" % name
# Check the basic structure of the object_data extension
cat = m.get_cat()
ref_data = meds.util.get_meds_output_dtype(1)
for tup in ref_data:
# Some of these tuples have 3 items, not 2. The last two are the full dtype tuple.
name = tup[0]
if len(tup) == 2:
dt = tup[1]
else:
dt = tup[1:]
dt = numpy.dtype(dt)
print(name, dt, cat.dtype[name], dt.char, cat.dtype[name].char)
assert name in cat.dtype.names, "column %s not present in object_data extension" % name
assert dt.char == cat.dtype[
name].char, "column %s is the wrong type" % name
# Check that we have the right number of objects.
n_obj = len(cat)
print('number of objects is %d' % n_obj)
numpy.testing.assert_equal(n_obj,
n_obj_test,
err_msg="MEDS file has wrong number of objects")
# loop over objects and exposures - test get_cutout
for iobj in range(n_obj):
# check ID is correct
numpy.testing.assert_equal(
cat['id'][iobj],
iobj + 1,
err_msg="MEDS file has wrong id for object %d" % iobj)
# get number of cutouts and check if it's right
n_cut = cat['ncutout'][iobj]
numpy.testing.assert_equal(
n_cut,
n_cut_test,
err_msg="MEDS file has wrong ncutout for object %d" % iobj)
# loop over cutouts
for icut in range(n_cut):
# get the images etc to compare with originals
img = m.get_cutout(iobj, icut, type='image')
wth = m.get_cutout(iobj, icut, type='weight')
seg = m.get_cutout(iobj, icut, type='seg')
psf = m.get_psf(iobj, icut)
wcs_meds = m.get_jacobian(iobj, icut)
# Note: col == x, row == y.
wcs_array_meds = numpy.array([
wcs_meds['dudcol'], wcs_meds['dudrow'], wcs_meds['dvdcol'],
wcs_meds['dvdrow'], wcs_meds['col0'], wcs_meds['row0']
])
# compare
numpy.testing.assert_array_equal(
img,
objlist[iobj].images[icut].array,
err_msg="MEDS cutout has wrong img for object %d" % iobj)
numpy.testing.assert_array_equal(
wth,
objlist[iobj].weight[icut].array,
err_msg="MEDS cutout has wrong wth for object %d" % iobj)
numpy.testing.assert_array_equal(
seg,
objlist[iobj].seg[icut].array,
err_msg="MEDS cutout has wrong seg for object %d" % iobj)
numpy.testing.assert_array_equal(
psf,
objlist[iobj].psf[icut].array,
err_msg="MEDS cutout has wrong psf for object %d" % iobj)
wcs_orig = objlist[iobj].wcs[icut]
wcs_array_orig = numpy.array([
wcs_orig.dudx, wcs_orig.dudy, wcs_orig.dvdx, wcs_orig.dvdy,
wcs_orig.origin.x, wcs_orig.origin.y
])
numpy.testing.assert_array_equal(
wcs_array_meds,
wcs_array_orig,
err_msg="MEDS cutout has wrong wcs for object %d" % iobj)
# get the mosaic to compare with originals
img = m.get_mosaic(iobj, type='image')
wth = m.get_mosaic(iobj, type='weight')
seg = m.get_mosaic(iobj, type='seg')
# There is currently no get_mosaic option for the psfs.
#psf = m.get_mosaic( iobj, type='psf')
psf = numpy.concatenate(
[m.get_psf(iobj, icut) for icut in range(n_cut)], axis=0)
# get the concatenated images - create the true mosaic
true_mosaic_img = numpy.concatenate(
[x.array for x in objlist[iobj].images], axis=0)
true_mosaic_wth = numpy.concatenate(
[x.array for x in objlist[iobj].weight], axis=0)
true_mosaic_seg = numpy.concatenate(
[x.array for x in objlist[iobj].seg], axis=0)
true_mosaic_psf = numpy.concatenate(
[x.array for x in objlist[iobj].psf], axis=0)
# compare
numpy.testing.assert_array_equal(
true_mosaic_img,
img,
err_msg="MEDS mosaic has wrong img for object %d" % iobj)
numpy.testing.assert_array_equal(
true_mosaic_wth,
wth,
err_msg="MEDS mosaic has wrong wth for object %d" % iobj)
numpy.testing.assert_array_equal(
true_mosaic_seg,
seg,
err_msg="MEDS mosaic has wrong seg for object %d" % iobj)
numpy.testing.assert_array_equal(
true_mosaic_psf,
psf,
err_msg="MEDS mosaic has wrong psf for object %d" % iobj)
# But here we build up to a much higher flux level where B/F is important.
t0 = time.time()
rng = galsim.UniformDeviate(seed)
treering_func = galsim.SiliconSensor.simple_treerings(
treering_amplitude, treering_period)
niter = int(counts_total / counts_per_iter + 0.5)
counts_per_iter = counts_total / niter # Recalculate in case not even multiple.
print('Total counts = {} = {} * {}'.format(counts_total, niter,
counts_per_iter))
# Not an LSST wcs, but just make sure this works properly with a non-trivial wcs.
wcs = galsim.FitsWCS('../../tests/fits_files/tnx.fits')
base_image = galsim.ImageF(nx + 2 * nborder, ny + 2 * nborder, wcs=wcs)
print('image bounds = ', base_image.bounds)
# nrecalc is actually irrelevant here, since a recalculation will be forced on each iteration.
# Which is really the point. We need to set coundsPerIter appropriately so that the B/F effect
# doesn't change *too* much between iterations.
sensor = galsim.SiliconSensor(rng=rng,
treering_func=treering_func,
treering_center=treering_center)
# We also need to account for the distortion of the wcs across the image.
# This expects sky_level in ADU/arcsec^2, not ADU/pixel.
base_image.wcs.makeSkyImage(base_image, sky_level=1.)
base_image.write('wcs_area.fits')
def generate(self,
dneigh=20,
central_flux=1912.0,
psf_size=3.7,
neighbour_flux=1912.0,
neighbour_size=3.2,
vary="psf_e"):
# PSF leakage toy model
#-----------------------------------------------------------------------
g_theta = {}
theta = np.linspace(0, 2, 50) * np.pi
self.g = {}
self.g["e1"] = []
self.g["e2"] = []
ang = []
# Setup a dummy wcs
# We load it here to avoid too much unncessary io
# In fact it should provide a skeleton only, since we overwrite the Jacobian with an identity matrix
wcs_path = "/share/des/disc2/y1/OPS/coadd/20141118000051_DES0014-4414/coadd/DES0014-4414_r.fits.fz"
orig_col = 1000
orig_row = 1000
image_pos = galsim.PositionD(orig_col, orig_row)
wcs = galsim.FitsWCS(wcs_path)
opt = p3s.Options(
"/home/samuroff/shear_pipeline/end-to-end/end-to-end_code/config_files/im3shape/params_disc.ini"
)
binning = {
"psf_e1": np.linspace(-0.2, 0.2, 12),
"cent_e1": [-0.65, 0.65]
}
self.binning = binning[vary]
# Cycle over psf ellipticities
for e in self.binning:
if vary == "psf_e1":
pe = e
ce = 0
elif vary == "cent_e1":
pe = 0
ce = e
g_theta["e1"] = []
g_theta["e2"] = []
ang = []
# For each psf ellipticity average over a ring of neighbour positions
# For the moment we hardcode the other relevant parameters to their mean values from the simulation
for i, t in enumerate(theta):
x = dneigh * np.cos(t)
y = dneigh * np.sin(t)
gal, psf = setup_simple(boxsize=48,
shear=(ce, 0.0),
flux=central_flux,
psf_ellipticity=(pe, 0.0),
psf_size=psf_size,
neighbour_ellipticity=(0.0, 0.0),
neighbour=[x, y],
neighbour_flux=neighbour_flux,
neighbour_size=neighbour_size,
wcs=wcs,
opt=opt)
res = run(gal, psf, opt=opt)
g_theta["e1"].append(res.e1)
gal, psf = setup_simple(boxsize=48,
shear=(ce, 0.0),
flux=central_flux,
psf_ellipticity=(pe, 0.0),
psf_size=psf_size,
neighbour_ellipticity=(0.0, 0.0),
neighbour=[np.inf, np.inf],
neighbour_flux=neighbour_flux,
neighbour_size=neighbour_size,
wcs=wcs,
opt=opt)
res = run(gal, psf, opt=opt)
g_theta["e2"].append(res.e1)
ang.append(t)
self.g["e1"].append(np.mean(g_theta["e1"]))
self.g["e2"].append(np.mean(g_theta["e2"]))
for k in self.g.keys():
self.g[k] = np.array(self.g[k])
def test_dcr():
"""Test the dcr surface op
"""
# This tests that implementing DCR with the surface op is equivalent to using
# ChromaticAtmosphere.
# We use fairly extreme choices for the parameters to make the comparison easier, so
# we can still get good discrimination of any errors with only 10^6 photons.
zenith_angle = 45 * galsim.degrees # Larger angle has larger DCR.
parallactic_angle = 129 * galsim.degrees # Something random, not near 0 or 180
pixel_scale = 0.03 # Small pixel scale means shifts are many pixels, rather than a fraction.
alpha = -1.2 # The normal alpha is -0.2, so this is exaggerates the effect.
bandpass = galsim.Bandpass('LSST_r.dat', 'nm')
base_wavelength = bandpass.effective_wavelength
base_wavelength += 500 # This exaggerates the effects fairly substantially.
sed = galsim.SED('CWW_E_ext.sed', wave_type='ang', flux_type='flambda')
flux = 1.e6
base_PSF = galsim.Kolmogorov(fwhm=0.3)
# Use ChromaticAtmosphere
im1 = galsim.ImageD(50, 50, scale=pixel_scale)
star = galsim.DeltaFunction() * sed
star = star.withFlux(flux, bandpass=bandpass)
chrom_PSF = galsim.ChromaticAtmosphere(base_PSF,
base_wavelength=base_wavelength,
zenith_angle=zenith_angle,
parallactic_angle=parallactic_angle,
alpha=alpha)
chrom = galsim.Convolve(star, chrom_PSF)
chrom.drawImage(bandpass, image=im1)
# Use PhotonDCR
im2 = galsim.ImageD(50, 50, scale=pixel_scale)
dcr = galsim.PhotonDCR(base_wavelength=base_wavelength,
zenith_angle=zenith_angle,
parallactic_angle=parallactic_angle,
alpha=alpha)
achrom = base_PSF.withFlux(flux)
rng = galsim.BaseDeviate(31415)
wave_sampler = galsim.WavelengthSampler(sed, bandpass, rng)
surface_ops = [wave_sampler, dcr]
achrom.drawImage(image=im2,
method='phot',
rng=rng,
surface_ops=surface_ops)
im1 /= flux # Divide by flux, so comparison is on a relative basis.
im2 /= flux
printval(im2, im1, show=False)
np.testing.assert_almost_equal(
im2.array,
im1.array,
decimal=4,
err_msg="PhotonDCR didn't match ChromaticAtmosphere")
# Repeat with thinned bandpass and SED to check that thin still works well.
im3 = galsim.ImageD(50, 50, scale=pixel_scale)
thin = 0.1 # Even higher also works. But this is probably enough.
thin_bandpass = bandpass.thin(thin)
thin_sed = sed.thin(thin)
print('len bp = %d => %d' %
(len(bandpass.wave_list), len(thin_bandpass.wave_list)))
print('len sed = %d => %d' % (len(sed.wave_list), len(thin_sed.wave_list)))
wave_sampler = galsim.WavelengthSampler(thin_sed, thin_bandpass, rng)
achrom.drawImage(image=im3,
method='phot',
rng=rng,
surface_ops=surface_ops)
im3 /= flux
printval(im3, im1, show=False)
np.testing.assert_almost_equal(
im3.array,
im1.array,
decimal=4,
err_msg="thinning factor %f led to 1.e-4 level inaccuracy" % thin)
# Check scale_unit
im4 = galsim.ImageD(50, 50, scale=pixel_scale / 60)
dcr = galsim.PhotonDCR(base_wavelength=base_wavelength,
zenith_angle=zenith_angle,
parallactic_angle=parallactic_angle,
scale_unit='arcmin',
alpha=alpha)
surface_ops = [wave_sampler, dcr]
achrom.dilate(1. / 60).drawImage(image=im4,
method='phot',
rng=rng,
surface_ops=surface_ops)
im4 /= flux
printval(im4, im1, show=False)
np.testing.assert_almost_equal(
im4.array,
im1.array,
decimal=4,
err_msg="PhotonDCR with scale_unit=arcmin, didn't match")
# Check some other valid options
# alpha = 0 means don't do any size scaling.
# obj_coord, HA and latitude are another option for setting the angles
# pressure, temp, and water pressure are settable.
# Also use a non-trivial WCS.
wcs = galsim.FitsWCS('des_data/DECam_00154912_12_header.fits')
image = galsim.Image(50, 50, wcs=wcs)
bandpass = galsim.Bandpass('LSST_r.dat', wave_type='nm').thin(0.1)
base_wavelength = bandpass.effective_wavelength
lsst_lat = galsim.Angle.from_dms('-30:14:23.76')
lsst_long = galsim.Angle.from_dms('-70:44:34.67')
local_sidereal_time = 3.14 * galsim.hours # Not pi. This is the time for this observation.
im5 = galsim.ImageD(50, 50, wcs=wcs)
obj_coord = wcs.toWorld(im5.true_center)
base_PSF = galsim.Kolmogorov(fwhm=0.9)
achrom = base_PSF.withFlux(flux)
dcr = galsim.PhotonDCR(
base_wavelength=bandpass.effective_wavelength,
obj_coord=obj_coord,
HA=local_sidereal_time - obj_coord.ra,
latitude=lsst_lat,
pressure=72, # default is 69.328
temperature=290, # default is 293.15
H2O_pressure=0.9) # default is 1.067
#alpha=0) # default is 0, so don't need to set it.
surface_ops = [wave_sampler, dcr]
achrom.drawImage(image=im5,
method='phot',
rng=rng,
surface_ops=surface_ops)
im6 = galsim.ImageD(50, 50, wcs=wcs)
star = galsim.DeltaFunction() * sed
star = star.withFlux(flux, bandpass=bandpass)
chrom_PSF = galsim.ChromaticAtmosphere(
base_PSF,
base_wavelength=bandpass.effective_wavelength,
obj_coord=obj_coord,
HA=local_sidereal_time - obj_coord.ra,
latitude=lsst_lat,
pressure=72,
temperature=290,
H2O_pressure=0.9,
alpha=0)
chrom = galsim.Convolve(star, chrom_PSF)
chrom.drawImage(bandpass, image=im6)
im5 /= flux # Divide by flux, so comparison is on a relative basis.
im6 /= flux
printval(im5, im6, show=False)
np.testing.assert_almost_equal(
im5.array,
im6.array,
decimal=3,
err_msg="PhotonDCR with alpha=0 didn't match")
# Also check invalid parameters
zenith_coord = galsim.CelestialCoord(13.54 * galsim.hours, lsst_lat)
assert_raises(
TypeError,
galsim.PhotonDCR,
zenith_angle=zenith_angle,
parallactic_angle=parallactic_angle) # base_wavelength is required
assert_raises(TypeError,
galsim.PhotonDCR,
base_wavelength=500,
parallactic_angle=parallactic_angle
) # zenith_angle (somehow) is required
assert_raises(
TypeError,
galsim.PhotonDCR,
500,
zenith_angle=34.4,
parallactic_angle=parallactic_angle) # zenith_angle must be Angle
assert_raises(TypeError,
galsim.PhotonDCR,
500,
zenith_angle=zenith_angle,
parallactic_angle=34.5) # parallactic_angle must be Angle
assert_raises(TypeError,
galsim.PhotonDCR,
500,
obj_coord=obj_coord,
latitude=lsst_lat) # Missing HA
assert_raises(TypeError,
galsim.PhotonDCR,
500,
obj_coord=obj_coord,
HA=local_sidereal_time - obj_coord.ra) # Missing latitude
assert_raises(TypeError, galsim.PhotonDCR, 500,
obj_coord=obj_coord) # Need either zenith_coord, or (HA,lat)
assert_raises(TypeError,
galsim.PhotonDCR,
500,
obj_coord=obj_coord,
zenith_coord=zenith_coord,
HA=local_sidereal_time -
obj_coord.ra) # Can't have both HA and zenith_coord
assert_raises(TypeError,
galsim.PhotonDCR,
500,
obj_coord=obj_coord,
zenith_coord=zenith_coord,
latitude=lsst_lat) # Can't have both lat and zenith_coord
assert_raises(TypeError,
galsim.PhotonDCR,
500,
zenith_angle=zenith_angle,
parallactic_angle=parallactic_angle,
H20_pressure=1.) # invalid (misspelled)
assert_raises(ValueError,
galsim.PhotonDCR,
500,
zenith_angle=zenith_angle,
parallactic_angle=parallactic_angle,
scale_unit='inches') # invalid scale_unit
# Invalid to use dcr without some way of setting wavelengths.
assert_raises(galsim.GalSimError,
achrom.drawImage,
im2,
method='phot',
surface_ops=[dcr])
config = desc.imsim.read_config()
obs_md, phot_params, _ = desc.imsim.parsePhoSimInstanceFile(args.instcat,
numRows=30)
sensor_list = args.sensors.split('^') if args.sensors is not None \
else args.sensors
rng = galsim.UniformDeviate(args.seed)
niter = int(args.counts_total / args.counts_per_iter + 0.5)
counts_per_iter = args.counts_total / niter
logger = desc.imsim.get_logger(args.log_level, name='make_flats')
visit = obs_md.OpsimMetaData['obshistID']
camera_wrapper = LSSTCameraWrapper()
wcs = galsim.FitsWCS(args.wcs_file) if args.wcs_file is not None else None
for det in camera_wrapper.camera:
det_name = det.getName()
if (det.getType() != cameraGeom.SCIENCE
or (args.sensors is not None and det_name not in sensor_list)):
continue
logger.info("processing %s", det_name)
gs_det = make_galsim_detector(camera_wrapper, det_name, phot_params,
obs_md)
desc.imsim.add_treering_info([gs_det])
my_flat = desc.imsim.make_flat(gs_det,
counts_per_iter,
niter,
rng,
logger=logger,
def test_withOrigin():
from test_wcs import Cubic
# First EuclideantWCS types:
wcs_list = [
galsim.OffsetWCS(0.3, galsim.PositionD(1, 1), galsim.PositionD(10,
23)),
galsim.OffsetShearWCS(0.23, galsim.Shear(g1=0.1, g2=0.3),
galsim.PositionD(12, 43)),
galsim.AffineTransform(0.01, 0.26, -0.26, 0.02,
galsim.PositionD(12, 43)),
galsim.UVFunction(ufunc=lambda x, y: 0.2 * x,
vfunc=lambda x, y: 0.2 * y),
galsim.UVFunction(ufunc=lambda x, y: 0.2 * x,
vfunc=lambda x, y: 0.2 * y,
xfunc=lambda u, v: u / scale,
yfunc=lambda u, v: v / scale),
galsim.UVFunction(ufunc='0.2*x + 0.03*y', vfunc='0.01*x + 0.2*y'),
]
color = 0.3
for wcs in wcs_list:
# Original version of the shiftOrigin tests in do_nonlocal_wcs using deprecated name.
new_origin = galsim.PositionI(123, 321)
wcs3 = check_dep(wcs.withOrigin, new_origin)
assert wcs != wcs3, name + ' is not != wcs.withOrigin(pos)'
wcs4 = wcs.local(wcs.origin, color=color)
assert wcs != wcs4, name + ' is not != wcs.local()'
assert wcs4 != wcs, name + ' is not != wcs.local() (reverse)'
world_origin = wcs.toWorld(wcs.origin, color=color)
if wcs.isUniform():
if wcs.world_origin == galsim.PositionD(0, 0):
wcs2 = wcs.local(wcs.origin,
color=color).withOrigin(wcs.origin)
assert wcs == wcs2, name + ' is not equal after wcs.local().withOrigin(origin)'
wcs2 = wcs.local(wcs.origin,
color=color).withOrigin(wcs.origin,
wcs.world_origin)
assert wcs == wcs2, name + ' not equal after wcs.local().withOrigin(origin,world_origin)'
world_pos1 = wcs.toWorld(galsim.PositionD(0, 0), color=color)
wcs3 = check_dep(wcs.withOrigin, new_origin)
world_pos2 = wcs3.toWorld(new_origin, color=color)
np.testing.assert_almost_equal(
world_pos2.x, world_pos1.x, 7,
'withOrigin(new_origin) returned wrong world position')
np.testing.assert_almost_equal(
world_pos2.y, world_pos1.y, 7,
'withOrigin(new_origin) returned wrong world position')
new_world_origin = galsim.PositionD(5352.7, 9234.3)
wcs5 = check_dep(wcs.withOrigin,
new_origin,
new_world_origin,
color=color)
world_pos3 = wcs5.toWorld(new_origin, color=color)
np.testing.assert_almost_equal(
world_pos3.x, new_world_origin.x, 7,
'withOrigin(new_origin, new_world_origin) returned wrong position')
np.testing.assert_almost_equal(
world_pos3.y, new_world_origin.y, 7,
'withOrigin(new_origin, new_world_origin) returned wrong position')
# Now some CelestialWCS types
cubic_u = Cubic(2.9e-5, 2000., 'u')
cubic_v = Cubic(-3.7e-5, 2000., 'v')
center = galsim.CelestialCoord(23 * galsim.degrees, -13 * galsim.degrees)
radec = lambda x, y: center.deproject_rad(
cubic_u(x, y) * 0.2, cubic_v(x, y) * 0.2, projection='lambert')
wcs_list = [
galsim.RaDecFunction(radec),
galsim.AstropyWCS('1904-66_TAN.fits', dir='fits_files'),
galsim.GSFitsWCS('tpv.fits', dir='fits_files'),
galsim.FitsWCS('sipsample.fits', dir='fits_files'),
]
for wcs in wcs_list:
# Original version of the shiftOrigin tests in do_celestial_wcs using deprecated name.
new_origin = galsim.PositionI(123, 321)
wcs3 = wcs.shiftOrigin(new_origin)
assert wcs != wcs3, name + ' is not != wcs.shiftOrigin(pos)'
wcs4 = wcs.local(wcs.origin)
assert wcs != wcs4, name + ' is not != wcs.local()'
assert wcs4 != wcs, name + ' is not != wcs.local() (reverse)'
world_pos1 = wcs.toWorld(galsim.PositionD(0, 0))
wcs3 = wcs.shiftOrigin(new_origin)
world_pos2 = wcs3.toWorld(new_origin)
np.testing.assert_almost_equal(
world_pos2.distanceTo(world_pos1) / galsim.arcsec, 0, 7,
'shiftOrigin(new_origin) returned wrong world position')
def test_wfirst_wcs():
"""Test the WFIRST WCS routines against those from software provided by WFIRST project office.
"""
# The standard against which we will compare is the output of some software provided by Jeff
# Kruk. The files used here were generated by Rachel on her Macbook using the script in
# wfirst_files/make_standards.sh, and none of the parameters below can be changed without
# modifying and rerunning that script. We use 4 sky positions and rotation angles (2 defined
# using the focal plane array, 2 using the observatory coordinates), and in each case, use a
# different SCA for our tests. We will simply read in the stored WCS and generate new ones, and
# check that they have the right value of SCA center and pixel scale at the center, and that if
# we offset by 500 pixels in some direction that gives the same sky position in each case.
ra_test = [127., 307.4, -61.52, 0.0]
dec_test = [-70., 50., 22.7, 0.0]
pa_test = [160., 79., 23.4, -3.1]
sca_test = [2, 13, 7, 18]
import datetime
ve = datetime.datetime(2025, 3, 20, 9, 2, 0)
date_test = [ve, ve, ve, datetime.date(2025, 6, 20)]
pa_is_fpa_test = [True, False, True, False]
dist_arcsec = []
dist_2_arcsec = []
pix_area_ratio = []
for i_test in range(len(ra_test)):
# Make the WCS for this test.
world_pos = galsim.CelestialCoord(ra_test[i_test] * galsim.degrees,
dec_test[i_test] * galsim.degrees)
if i_test == 0:
# Just for this case, we want to get the WCS for all SCAs. This will enable some
# additional tests that we don't do for the other test case.
gs_wcs_dict = galsim.wfirst.getWCS(
PA=pa_test[i_test] * galsim.degrees,
world_pos=world_pos,
PA_is_FPA=pa_is_fpa_test[i_test],
date=date_test[i_test])
np.testing.assert_equal(
len(gs_wcs_dict),
galsim.wfirst.n_sca,
err_msg='WCS dict has wrong length: %d vs. %d' %
(len(gs_wcs_dict), galsim.wfirst.n_sca))
else:
# Use the SCAs keyword to just get the WCS for the SCA that we want.
gs_wcs_dict = galsim.wfirst.getWCS(
PA=pa_test[i_test] * galsim.degrees,
world_pos=world_pos,
PA_is_FPA=pa_is_fpa_test[i_test],
SCAs=sca_test[i_test],
date=date_test[i_test])
np.testing.assert_equal(
len(gs_wcs_dict),
1,
err_msg='WCS dict has wrong length: %d vs. %d' %
(len(gs_wcs_dict), 1))
# Read in reference.
test_file = 'test%d_sca_%02d.fits' % (i_test + 1, sca_test[i_test])
ref_wcs = galsim.FitsWCS(os.path.join('wfirst_files', test_file))
gs_wcs = gs_wcs_dict[sca_test[i_test]]
# Check center position:
im_cent_pos = galsim.PositionD(galsim.wfirst.n_pix / 2.,
galsim.wfirst.n_pix / 2)
ref_cent_pos = ref_wcs.toWorld(im_cent_pos)
gs_cent_pos = gs_wcs.toWorld(im_cent_pos)
dist_arcsec.append(
ref_cent_pos.distanceTo(gs_cent_pos) / galsim.arcsec)
# Check pixel area
rat = ref_wcs.pixelArea(image_pos=im_cent_pos) / gs_wcs.pixelArea(
image_pos=im_cent_pos)
pix_area_ratio.append(rat - 1.)
# Check another position, just in case rotations are messed up.
im_other_pos = galsim.PositionD(im_cent_pos.x + 500.,
im_cent_pos.y - 200.)
ref_other_pos = ref_wcs.toWorld(im_other_pos)
gs_other_pos = gs_wcs.toWorld(im_other_pos)
dist_2_arcsec.append(
ref_other_pos.distanceTo(gs_other_pos) / galsim.arcsec)
if i_test == 0:
# For just one of our tests cases, we'll do some additional tests. These will target
# the findSCA() functionality. First, we'll choose an SCA and check that its center is
# found to be in that SCA.
found_sca = galsim.wfirst.findSCA(gs_wcs_dict, gs_cent_pos)
np.testing.assert_equal(
found_sca,
sca_test[i_test],
err_msg='Did not find SCA center position to be on that SCA!')
# Then, we go to a place that should be off the side by a tiny bit, and check that it is
# NOT on an SCA if we exclude borders, but IS on the SCA if we include borders.
im_off_edge_pos = galsim.PositionD(-2., galsim.wfirst.n_pix / 2.)
world_off_edge_pos = gs_wcs.toWorld(im_off_edge_pos)
found_sca = galsim.wfirst.findSCA(gs_wcs_dict, world_off_edge_pos)
assert found_sca is None
found_sca = galsim.wfirst.findSCA(gs_wcs_dict,
world_off_edge_pos,
include_border=True)
np.testing.assert_equal(
found_sca,
sca_test[i_test],
err_msg='Did not find slightly off-edge position on the SCA'
' when including borders!')
np.testing.assert_array_less(
np.array(dist_arcsec),
np.ones(len(ra_test)) * galsim.wfirst.pixel_scale / 100,
err_msg=
'For at least one WCS, center offset from reference was > 0.01(pixel scale).'
)
np.testing.assert_array_less(
np.array(dist_2_arcsec),
np.ones(len(ra_test)) * galsim.wfirst.pixel_scale / 100,
err_msg=
'For at least one WCS, other offset from reference was > 0.01(pixel scale).'
)
np.testing.assert_array_less(
np.array(pix_area_ratio),
np.ones(len(ra_test)) * 0.0001,
err_msg=
'For at least one WCS, pixel areas differ from reference by >0.01%.')
# Check whether we're allowed to look at certain positions on certain dates.
# Let's choose RA=90 degrees, dec=10 degrees.
# We know that it's best to look about 90 degrees from the Sun. So on the vernal and autumnal
# equinox, this should be a great place to look, but not midway in between. We'll use
# approximate dates for these.
pos = galsim.CelestialCoord(90. * galsim.degrees, 10. * galsim.degrees)
import datetime
assert galsim.wfirst.allowedPos(pos, datetime.date(2025, 3, 20))
assert galsim.wfirst.allowedPos(pos, datetime.date(2025, 9, 20))
assert not galsim.wfirst.allowedPos(pos, datetime.date(2025, 6, 20))
# Finally make sure it does something reasonable for the observatory position angle.
# When the sun is at (0,0), and we look at (90,0), then +Z points towards the Sun and +Y points
# North, giving a PA of 0 degrees.
pos = galsim.CelestialCoord(90. * galsim.degrees, 0. * galsim.degrees)
test_date = datetime.datetime(2025, 3, 20, 9, 2)
pa = galsim.wfirst.bestPA(pos, test_date)
np.testing.assert_almost_equal(pa.rad(), 0., decimal=3)
# Now make it look at the same RA as the sun but quite different declination. It wants +Z
# pointing North toward Sun, so we'll get a -90 degree angle for the PA.
pos = galsim.CelestialCoord(0. * galsim.degrees, -70. * galsim.degrees)
pa = galsim.wfirst.bestPA(pos, test_date)
np.testing.assert_almost_equal(pa.rad(), -np.pi / 2, decimal=3)
def test_psf():
"""Test the two kinds of PSF files we have in DES.
"""
data_dir = 'des_data'
psfex_file = "DECam_00154912_12_psfcat.psf"
fitpsf_file = "DECam_00154912_12_fitpsf.fits"
wcs_file = "DECam_00154912_12_header.fits"
wcs = galsim.FitsWCS(wcs_file, dir=data_dir)
# We don't require that the files in example_data_dir have been downloaded. If they
# haven't, then we just directly set the comparison values that we want here.
example_data_dir = '../examples/des/des_data'
cat_file = "DECam_00154912_12_cat.fits"
image_file = "DECam_00154912_12.fits.fz"
try:
cat = galsim.Catalog(cat_file, hdu=2, dir=example_data_dir)
size = numpy.array(
[cat.getFloat(i, 'FLUX_RADIUS') for i in range(cat.nobjects)])
mag = numpy.array(
[cat.getFloat(i, 'MAG_AUTO') for i in range(cat.nobjects)])
flags = numpy.array(
[cat.getInt(i, 'FLAGS') for i in range(cat.nobjects)])
index = numpy.array(range(cat.nobjects))
xvals = numpy.array(
[cat.getFloat(i, 'X_IMAGE') for i in range(cat.nobjects)])
yvals = numpy.array(
[cat.getFloat(i, 'Y_IMAGE') for i in range(cat.nobjects)])
# Pick bright small objects as probable stars
mask = (flags
== 0) & (mag < 14) & (mag > 13) & (size > 2) & (size < 2.5)
idx = numpy.argsort(size[mask])
# This choice of a star is fairly isolated from neighbors, isn't too near an edge or a tape
# bump, and doesn't have any noticeable image artifacts in its vicinity.
x = xvals[mask][idx][27]
y = yvals[mask][idx][27]
print('Using x,y = ', x, y)
image_pos = galsim.PositionD(x, y)
print('size, mag = ', size[mask][idx][27], mag[mask][idx][27])
data = galsim.fits.read(image_file, dir=example_data_dir)
b = galsim.BoundsI(int(x) - 15, int(x) + 16, int(y) - 15, int(y) + 16)
data_stamp = data[b]
header = galsim.fits.FitsHeader(image_file, dir=example_data_dir)
sky_level = header['SKYBRITE']
data_stamp -= sky_level
raw_meas = data_stamp.FindAdaptiveMom()
print('raw_meas = ', raw_meas)
ref_size = raw_meas.moments_sigma
ref_shape = raw_meas.observed_shape
print('ref size: ', ref_size)
print('ref shape: ', ref_shape)
except IOError:
x, y = 1195.64074707, 1276.63427734
image_pos = galsim.PositionD(x, y)
b = galsim.BoundsI(int(x) - 15, int(x) + 16, int(y) - 15, int(y) + 16)
ref_size = 1.80668628216
ref_shape = galsim.Shear(g1=0.022104322221, g2=-0.130925191715)
# First the PSFEx model using the wcs_file to get the model is sky coordinates.
psfex = galsim.des.DES_PSFEx(psfex_file, wcs_file, dir=data_dir)
psf = psfex.getPSF(image_pos)
# The getLocalWCS function should return a local WCS
assert psfex.getLocalWCS(image_pos).isLocal()
# Draw the postage stamp image
# Note: the PSF already includes the pixel response, so draw with method 'no_pixel'.
stamp = psf.drawImage(wcs=wcs.local(image_pos),
bounds=b,
method='no_pixel')
print('wcs = ', wcs.local(image_pos))
meas = stamp.FindAdaptiveMom()
print('meas = ', meas)
print('pixel scale = ', stamp.wcs.minLinearScale(image_pos=image_pos))
print('cf sizes: ', ref_size, meas.moments_sigma)
print('cf shapes: ', ref_shape, meas.observed_shape)
# The agreement for a single star is not great of course, not even 2 decimals.
# Divide by 2 to get agreement at 2 dp.
numpy.testing.assert_almost_equal(meas.moments_sigma / 2,
ref_size / 2,
decimal=2,
err_msg="PSFEx size doesn't match")
numpy.testing.assert_almost_equal(meas.observed_shape.g1 / 2,
ref_shape.g1 / 2,
decimal=2,
err_msg="PSFEx shape.g1 doesn't match")
numpy.testing.assert_almost_equal(meas.observed_shape.g2 / 2,
ref_shape.g2 / 2,
decimal=2,
err_msg="PSFEx shape.g2 doesn't match")
# Repeat without the wcs_file argument, so the model is in chip coordinates.
# Also check the functionality where the file is already open.
with pyfits.open(os.path.join(data_dir, psfex_file)) as hdu_list:
psfex = galsim.des.DES_PSFEx(hdu_list[1])
psf = psfex.getPSF(image_pos)
# In this case, the getLocalWCS function won't return anything useful.
assert psfex.getLocalWCS(image_pos) is None
# Draw the postage stamp image. This time in image coords, so pixel_scale = 1.0.
stamp = psf.drawImage(bounds=b, scale=1.0, method='no_pixel')
meas = stamp.FindAdaptiveMom()
numpy.testing.assert_almost_equal(
meas.moments_sigma / 2,
ref_size / 2,
decimal=2,
err_msg="no-wcs PSFEx size doesn't match")
numpy.testing.assert_almost_equal(
meas.observed_shape.g1 / 2,
ref_shape.g1 / 2,
decimal=2,
err_msg="no-wcs PSFEx shape.g1 doesn't match")
numpy.testing.assert_almost_equal(
meas.observed_shape.g2 / 2,
ref_shape.g2 / 2,
decimal=2,
err_msg="no-wcs PSFEx shape.g2 doesn't match")
# Now the shapelet PSF model. This model is already in sky coordinates, so no wcs_file needed.
fitpsf = galsim.des.DES_Shapelet(os.path.join(data_dir, fitpsf_file))
psf = fitpsf.getPSF(image_pos)
# Draw the postage stamp image
# Again, the PSF already includes the pixel response.
stamp = psf.drawImage(wcs=wcs.local(image_pos),
bounds=b,
method='no_pixel')
meas = stamp.FindAdaptiveMom()
numpy.testing.assert_almost_equal(
meas.moments_sigma / 2,
ref_size / 2,
decimal=2,
err_msg="Shapelet PSF size doesn't match")
numpy.testing.assert_almost_equal(
meas.observed_shape.g1 / 2,
ref_shape.g1 / 2,
decimal=2,
err_msg="Shapelet PSF shape.g1 doesn't match")
numpy.testing.assert_almost_equal(
meas.observed_shape.g2 / 2,
ref_shape.g2 / 2,
decimal=2,
err_msg="Shapelet PSF shape.g2 doesn't match")
def test_psf_config():
"""Test building the two PSF types using the config layer.
"""
data_dir = 'des_data'
psfex_file = "DECam_00154912_12_psfcat.psf"
fitpsf_file = "DECam_00154912_12_fitpsf.fits"
wcs_file = "DECam_00154912_12_header.fits"
image_pos = galsim.PositionD(123.45, 543.21)
config = {
'input': {
'des_shapelet': {
'dir': data_dir,
'file_name': fitpsf_file
},
'des_psfex': [
{
'dir': data_dir,
'file_name': psfex_file
},
{
'dir': data_dir,
'file_name': psfex_file,
'image_file_name': wcs_file
},
]
},
'psf1': {
'type': 'DES_Shapelet'
},
'psf2': {
'type': 'DES_PSFEx',
'num': 0
},
'psf3': {
'type': 'DES_PSFEx',
'num': 1
},
'psf4': {
'type': 'DES_Shapelet',
'image_pos': galsim.PositionD(567, 789),
'flux': 179,
'gsparams': {
'folding_threshold': 1.e-4
}
},
'psf5': {
'type': 'DES_PSFEx',
'image_pos': galsim.PositionD(789, 567),
'flux': 388,
'gsparams': {
'folding_threshold': 1.e-4
}
},
# This would normally be set by the config processing. Set it manually here.
'image_pos': image_pos,
}
galsim.config.ProcessInput(config)
psf1a = galsim.config.BuildGSObject(config, 'psf1')[0]
fitpsf = galsim.des.DES_Shapelet(fitpsf_file, dir=data_dir)
psf1b = fitpsf.getPSF(image_pos)
gsobject_compare(psf1a, psf1b)
psf2a = galsim.config.BuildGSObject(config, 'psf2')[0]
psfex0 = galsim.des.DES_PSFEx(psfex_file, dir=data_dir)
psf2b = psfex0.getPSF(image_pos)
gsobject_compare(psf2a, psf2b)
psf3a = galsim.config.BuildGSObject(config, 'psf3')[0]
psfex1 = galsim.des.DES_PSFEx(psfex_file, wcs_file, dir=data_dir)
psf3b = psfex1.getPSF(image_pos)
gsobject_compare(psf3a, psf3b)
gsparams = galsim.GSParams(folding_threshold=1.e-4)
psf4a = galsim.config.BuildGSObject(config, 'psf4')[0]
psf4b = fitpsf.getPSF(galsim.PositionD(567, 789),
gsparams=gsparams).withFlux(179)
gsobject_compare(psf4a, psf4b)
# Insert a wcs for thes last one.
config['wcs'] = galsim.FitsWCS(os.path.join(data_dir, wcs_file))
del config['input_objs']
galsim.config.ProcessInput(config)
psfex2 = galsim.des.DES_PSFEx(psfex_file, dir=data_dir, wcs=config['wcs'])
psf5a = galsim.config.BuildGSObject(config, 'psf5')[0]
psf5b = psfex2.getPSF(galsim.PositionD(789, 567),
gsparams=gsparams).withFlux(388)
gsobject_compare(psf5a, psf5b)
def main(argv):
root = 'DECam_00154912'
data_dir = 'des_data'
if not os.path.exists(data_dir):
print('You will need to download some DES data to use this script.')
print('Run the following commands from the directory GalSim/examples/des:')
print()
print(' wget http://www.sas.upenn.edu/~mjarvis/des_data.tar.gz')
print(' tar xfz des_data.tar.gz')
print()
print('Then try running this script again. It should work now.')
sys.exit()
# Set which chips to run on
first_chip = 1
last_chip = 62
#first_chip = 12
#last_chip = 12
# quick and dirty command line parsing.
for var in argv:
if var.startswith('first='): first_chip = int(var[6:])
if var.startswith('last='): last_chip = int(var[5:])
print('Processing chips %d .. %d'%(first_chip, last_chip))
out_dir = 'output'
# The random seed, so the results are deterministic
random_seed = 1339201
x_col = 'X_IMAGE'
y_col = 'Y_IMAGE'
flux_col = 'FLUX_AUTO'
flag_col = 'FLAGS'
xsize_key = 'NAXIS1'
ysize_key = 'NAXIS2'
sky_level_key = 'SKYBRITE'
sky_sigma_key = 'SKYSIGMA'
# Make output directory if not already present.
if not os.path.isdir(out_dir):
os.mkdir(out_dir)
for chipnum in range(first_chip,last_chip+1):
print('Start chip ',chipnum)
# Setup the file names
image_file = '%s_%02d.fits.fz'%(root,chipnum)
cat_file = '%s_%02d_cat.fits'%(root,chipnum)
psfex_file = '%s_%02d_psfcat.psf'%(root,chipnum)
fitpsf_file = '%s_%02d_fitpsf.fits'%(root,chipnum)
psfex_image_file = '%s_%02d_psfex_image.fits'%(root,chipnum)
fitpsf_image_file = '%s_%02d_fitpsf_image.fits'%(root,chipnum)
# Get some parameters about the image from the data image header information
image_header = galsim.FitsHeader(image_file, dir=data_dir)
xsize = image_header[xsize_key]
ysize = image_header[ysize_key]
sky_sigma = image_header[sky_sigma_key] # This is sqrt(variance) / pixel
sky_level = image_header[sky_level_key] # This is in ADU / pixel
gain = sky_level / sky_sigma**2 # an approximation, since gain is missing.
# Read the WCS
wcs = galsim.FitsWCS(header=image_header)
# Setup the images:
psfex_image = galsim.Image(xsize, ysize, wcs=wcs)
fitpsf_image = galsim.Image(xsize, ysize, wcs=wcs)
# Read the other input files
cat = galsim.Catalog(cat_file, hdu=2, dir=data_dir)
psfex = galsim.des.DES_PSFEx(psfex_file, image_file, dir=data_dir)
fitpsf = galsim.des.DES_Shapelet(fitpsf_file, dir=data_dir)
nobj = cat.nobjects
print('Catalog has ',nobj,' objects')
for k in range(nobj):
sys.stdout.write('.')
sys.stdout.flush()
# Skip objects with a non-zero flag
flag = cat.getInt(k,flag_col)
if flag: continue
# Get the position from the galaxy catalog
x = cat.getFloat(k,x_col)
y = cat.getFloat(k,y_col)
image_pos = galsim.PositionD(x,y)
#print ' pos = ',image_pos
x += 0.5 # + 0.5 to account for even-size postage stamps
y += 0.5
ix = int(math.floor(x+0.5)) # round to nearest pixel
iy = int(math.floor(y+0.5))
dx = x-ix
dy = y-iy
offset = galsim.PositionD(dx,dy)
# Also get the flux of the galaxy from the catalog
flux = cat.getFloat(k,flux_col)
#print ' flux = ',flux
#print ' wcs = ',wcs.local(image_pos)
# First do the PSFEx image:
if True:
# Define the PSF profile
psf = psfex.getPSF(image_pos).withFlux(flux)
#print ' psfex psf = ',psf
# Draw the postage stamp image
# Note: Use no_pixel method, since the PSFEx estimate of the PSF already includes
# the pixel response.
stamp = psf.drawImage(wcs=wcs.local(image_pos), offset=offset, method='no_pixel')
# Recenter the stamp at the desired position:
stamp.setCenter(ix,iy)
# Find overlapping bounds
bounds = stamp.bounds & psfex_image.bounds
psfex_image[bounds] += stamp[bounds]
# Next do the ShapeletPSF image:
# If the position is not within the interpolation bounds, fitpsf will
# raise an exception telling us to skip this object. Easier to check here.
if fitpsf.bounds.includes(image_pos):
# Define the PSF profile
psf = fitpsf.getPSF(image_pos).withFlux(flux)
#print ' fitpsf psf = ',psf
# Draw the postage stamp image
# Again, the PSF already includes the pixel response.
stamp = psf.drawImage(wcs=wcs.local(image_pos), offset=offset, method='no_pixel')
# Recenter the stamp at the desired position:
stamp.setCenter(ix,iy)
# Find overlapping bounds
bounds = stamp.bounds & fitpsf_image.bounds
fitpsf_image[bounds] += stamp[bounds]
else:
pass
#print '...not in fitpsf.bounds'
print()
# Add background level
psfex_image += sky_level
fitpsf_image += sky_level
# Add noise
rng = galsim.BaseDeviate(random_seed)
noise = galsim.CCDNoise(rng, gain=gain)
psfex_image.addNoise(noise)
# Reset the random seed to match the action of the yaml version
# Note: the difference between seed and reset matters here.
# reset would sever the connection between this rng instance and the one stored in noise.
# seed changes the seed while keeping the connection between them.
rng.seed(random_seed)
fitpsf_image.addNoise(noise)
# Now write the images to disk.
psfex_image.write(psfex_image_file, dir=out_dir)
fitpsf_image.write(fitpsf_image_file, dir=out_dir)
print('Wrote images to %s and %s'%(
os.path.join(out_dir,psfex_image_file),
os.path.join(out_dir,fitpsf_image_file)))
# Increment the random seed by the number of objects in the file
random_seed += nobj
# We make new seg files now, so use out_dir for those paths as well. But don't copy the originals.
seg_path = [ os.path.join(out_dir,os.path.basename(file)) for file in seg_path ]
src_cols[0] = list(out_path[1:])
src_cols[1] = list(sky_path[1:])
src_cols[2] = list(seg_path[1:])
src_rows = zip(*src_cols)
out_src_file = os.path.join(out_dir,os.path.basename(coadd_srclist))
with open(out_src_file,'w') as out_src:
for row in src_rows:
out_src.write('%s %s %s %s\n'%(row))
# Read the image files and make blank ones.
# In principal, we could read the files and get the bounds from that, but
# that's slow. So we just use the known bounds and use that for everything.
se_bounds = galsim.BoundsI(1,2048,1,4096)
image_wcs = [ galsim.FitsWCS(file_name) for file_name in image_path ]
images = [ galsim.Image(wcs=wcs, bounds=se_bounds) for wcs in image_wcs ]
# Except the first one (the coadd image) is different
coadd_bounds = galsim.BoundsI(1,10000,1,10000)
images[0] = galsim.Image(wcs=image_wcs[0], bounds=coadd_bounds)
print 'Initialized the blank images'
# Setup a PSF that varies according to a second order function across the image
# Each chip will have its own PSF functions for size, e1, e2.
# size = 0.9 arcsec + 0.2 arcsec * F_size(x,y)
# e1 = 0.05 * F_e1(x,y)
# e2 = 0.05 * F_e2(x,y)
# where each F has the form: a + b T1(x) + c T1(y) + d T2(x) + e T1(x) T1(y) + f T2(y)
# Similar for e1, e2. So need 18 parameters. Each parameter is chosen to
# fall between -1 and 1, and the polynomial factors are Chebyshev polynomials
# using the appropriate bounds (different for x,y) also vary between -1 and 1.
def read_image_header(img_file):
"""Read some information from the image header.
Returns (date, time, filter, ccdnum, detpos, telra, teldec, ha,
airmass, sky, sigsky, fwhm, tiling, hex, wcs)
"""
print 'Start read_image_header'
print img_file
import galsim
import astropy.io.fits as pyfits
if img_file.endswith('fz'):
hdu = 1
else:
hdu = 0
# fitsio is a bit faster here. 11 sec/exp rather than 12, so not a huge difference, but still.
with pyfits.open(img_file) as pyf:
#print pyf
#print pyf[hdu]
h = pyf[hdu].header
#h = pyf[hdu].read_header()
#print 'opened'
# DATE-OBS looks like '2012-12-03T07:38:54.174780', so split on T.
date = h['DATE-OBS']
date, time = date.strip().split('T', 1)
# FILTER looks like 'z DECam SDSS c0004 9260.0 1520.0', so split on white space
filter = h['FILTER']
filter = filter.split()[0]
# CCDNUM is 1-62. DETPOS is a string such as 'S29 '. Strip off the whitespace.
ccdnum = h['CCDNUM']
ccdnum = int(ccdnum)
detpos = h['DETPOS']
detpos = detpos.strip()
#print 'detpos = ',detpos
# TELRA, TELDEC look like '-62:30:22.320'. Use GalSim to convert to decimal degrees.
telra = h['TELRA']
teldec = h['TELDEC']
telra = galsim.HMS_Angle(telra) / galsim.degrees
teldec = galsim.DMS_Angle(teldec) / galsim.degrees
#print 'telra, teldec = ',telra,teldec
# HA looks like '03:12:02.70''. Use GalSim to convert to decimal degrees.
ha = h['HA']
ha = galsim.HMS_Angle(ha) / galsim.degrees
# A few more items to grab from the header, but allow default values for these:
airmass = float(h.get('AIRMASS', -999))
sky = float(h.get('SKYBRITE', -999))
sigsky = float(h.get('SKYSIGMA', -999))
fwhm = float(h.get('FWHM', -999))
tiling = int(h.get('TILING', 0))
hex = int(h.get('HEX', 0))
# Use Galsim to read WCS
wcs = galsim.FitsWCS(header=h)
#print 'wcs = ',wcs
return (date, time, filter, ccdnum, detpos, telra, teldec, ha, airmass,
sky, sigsky, fwhm, tiling, hex, wcs)
def analyse1(
self,
central_data,
neighbour_data,
nreal=1000
): #, central_ellipticity, dneigh=20, central_flux=1912.0, psf_size=3.7, neighbour_flux=1912.0, neighbour_size=3.2, nrealisations=1000):
# Level 1 - loop over SNR
#-----------------------------------------------------------------------
# Initialise the random number generator
np.random.seed(self.random_seed)
self.object_mask = np.loadtxt("mask_template.txt")
m = {}
m[1] = []
m[2] = []
c = {}
c[1] = []
c[2] = []
snr = []
# Setup a dummy wcs
# We load it here to avoid too much unncessary io
# In fact it should provide a skeleton only, since we overwrite the Jacobian with an identity matrix
wcs_path = "/share/des/disc2/y1/OPS/coadd/20141118000051_DES0014-4414/coadd/DES0014-4414_r.fits.fz"
orig_col = 1000
orig_row = 1000
image_pos = galsim.PositionD(orig_col, orig_row)
self.wcs = galsim.FitsWCS(wcs_path)
self.opt = p3s.Options(
"/home/samuroff/shear_pipeline/end-to-end/end-to-end_code/config_files/im3shape/params_disc.ini"
)
self.binning = np.logspace(1, 2.8, 12)
upper = self.binning[1:]
lower = self.binning[:-1]
# Cycle over the central flux, as a proxy for SNR
for i, limits in enumerate(zip(lower, upper)):
snr_min = limits[0]
snr_max = limits[1]
print "Level 1 iteration: %d SNR = %3.3f - %3.3f" % (
i + 1, snr_min, snr_max)
# Selection function for this bin
sel = (central_data.res["snr"] >
snr_min) & (central_data.res["snr"] < snr_max)
print "Will do %d realisations for this bin:" % nreal
De1 = []
De2 = []
sn = []
g1 = []
g2 = []
for j in xrange(nreal):
print "%d/%d" % (j + 1, nreal)
self.generate_central_realisation(central_data, sel)
self.generate_neighbour_realisation(neighbour_data,
central_data, sel)
# Draw this neighbour realisation repeatedly on a ring of angular positions
snr, e1, e2 = self.do_position_loop()
sn.append(snr)
De1.append(e1)
De2.append(e2)
g1.append(self.g[0])
g2.append(self.g[1])
data = np.zeros(len(g1),
dtype=[("e1", float), ("e2", float),
("true_g1", float), ("true_g2", float)])
data["e1"], data["e2"] = np.array(De1), np.array(De2)
data["true_g1"], data["true_g2"] = np.array(g1), np.array(g2)
bias = di.get_bias(data,
nbins=5,
names=["m11", "m22", "c11", "c22"],
binning="equal_number",
silent=True)
print bias
m[1].append(bias["m11"][0])
m[2].append(bias["m22"][0])
c[1].append(bias["c11"][0])
c[2].append(bias["c22"][0])
import pdb
pdb.set_trace()
print "Done all loops"
def setup_simple(boxsize=32,
model="disc",
upsample=1,
size=2,
flux=None,
shear=(0, 0),
neighbour=[np.inf, np.inf],
neighbour_size=2.0,
neighbour_flux=0.13,
neighbour_ellipticity=(0, 0),
psf_ellipticity=(0, 0),
psf_size=0.1,
wcs=None,
opt=None):
"""Basic function to construct a test galaxy for exploring shape biases."""
if opt is None:
opt = p3s.Options(
"/home/samuroff/shear_pipeline/end-to-end/end-to-end_code/config_files/im3shape/params_disc.ini"
)
opt.stamp_size = boxsize
psfsize = (boxsize +
opt._struct.contents.padding) * opt._struct.contents.upsampling
upsampling = opt._struct.contents.upsampling
large_boxsize = boxsize * 7
gal1 = get_model(size=size,
type=model,
g1=shear[0],
g2=shear[1],
flux=flux)
pos1 = galsim.PositionD(0, 0)
# Add a tiny nominal PSF
psf, psf_image = get_fixed_gaussian_psf(opt, psf_size, psf_ellipticity[0],
psf_ellipticity[1], wcs)
#import pdb ; pdb.set_trace()
#galsim.Gaussian(fwhm=psf_size*0.27)
if wcs is None:
wcs_path = "/share/des/disc2/y1/OPS/coadd/20141118000051_DES0014-4414/coadd/DES0014-4414_r.fits.fz"
wcs = galsim.FitsWCS(wcs_path)
orig_col = 1000
orig_row = 1000
image_pos = galsim.PositionD(orig_col, orig_row)
local_wcs = wcs.local(image_pos)
local_wcs._dudx = 1.0
local_wcs._dudy = 0.0
local_wcs._dvdx = 0.0
local_wcs._dvdy = 1.0
A = np.array([[local_wcs._dudx, local_wcs._dudy],
[local_wcs._dvdx, local_wcs._dvdy]])
local_wcs._det = np.linalg.det(A)
pix = wcs.toWorld(galsim.Pixel(0.27), image_pos=image_pos)
obj1 = galsim.Convolve([gal1, psf, pix])
im1 = obj1.drawImage(wcs=local_wcs,
nx=large_boxsize,
ny=large_boxsize,
method='no_pixel')
im3 = obj1.drawImage(wcs=local_wcs,
nx=large_boxsize,
ny=large_boxsize,
method='no_pixel')
# And a neighbouring object if specified
if np.isfinite(np.array(neighbour)).all():
print "drawing neighbour at (%d, %d)" % (int(
neighbour[0]), int(neighbour[1]))
gal2 = galsim.Sersic(n=1, half_light_radius=neighbour_size)
gal2 = gal2.withFlux(neighbour_flux)
nshear = galsim.Shear(g1=neighbour_ellipticity[0],
g2=neighbour_ellipticity[1])
gal2 = gal2.shear(nshear)
obj2 = galsim.Convolve([gal2, psf, pix])
pos2 = galsim.PositionD(x=neighbour[0], y=neighbour[1])
im2 = obj2.drawImage(wcs=local_wcs,
nx=large_boxsize,
ny=large_boxsize,
method='no_pixel',
offset=pos2)
im3 += im2.array
trim = (large_boxsize - boxsize) / 2.
lim = galsim.BoundsI(xmin=trim,
xmax=large_boxsize - trim - 1,
ymin=trim,
ymax=large_boxsize - trim - 1)
del (wcs)
gc.collect()
return im3[lim].array, psf_image
