def _get_projection(self):
if self.hdu is None:
try:
hdu = SkyView.get_images(position=self.coord,
coordinates='icrs',
survey=self.survey,
radius=self.radius * u.arcsec,
grid=self.grid)[0][0]
wcs = WCS(hdu.header)
self.vlim = PercentileInterval(99.).get_limits(hdu.data)
except (IndexError, HTTPError):
hdu = SkyView.get_images(position=self.coord,
coordinates='icrs',
survey=self.survey,
radius=self.radius * u.arcsec -
1 * u.arcsec,
grid=self.grid)[0][0]
wcs = WCS(hdu.header)
self.vlim = PercentileInterval(99.).get_limits(hdu.data)
else:
wcs = WCS(self.hdu.header)
self.vlim = PercentileInterval(99.).get_limits(self.hdu.data)
return wcs
def get_images(self, pos, radius, surveys, savefits=True, dirname='images/'):
if not os.path.exists(dirname):
os.makedirs(dirname)
images = SkyView.get_images(position=pos, coordinates='icrs', survey=surveys, radius=radius*u.arcmin, pixels=1000)
if savefits:
for i, s in enumerate(surveys):
images[i].writeto(dirname+s+'.fits', clobber=True) # overwrite existing file
else:
images = []
for i, s in enumerate(surveys):
filename = dirname+s+'.fits'
if not os.path.isfile(filename):
img = SkyView.get_images(position=pos, coordinates='icrs', survey=[s], radius=radius*u.arcmin, pixels=1000)
images.append(img[0])
if savefits:
images[i].writeto(filename, clobber=True) # overwrite existing file
else:
images.append(fits.open(filename))
return images
def get_source_images(target,
survey_list,
pixels=512,
folder='./',
verbose=False):
'''
Download postagestamp images of targets from SkyView
:param target: An astropy table row containing the name and coordinates of the target
:param survey_list: A list of strings containing survey names
:param pixels: An integer, the dimensions of the requested (square) image
:param folder: A string, the location where downloaded images should be saved
:param verbose: A boolean, determine whether or not to print errors
'''
paths = SkyView.get_image_list(
position='%s, %s' % (target['ra'], target['dec']), survey=survey_list
) # can't use get_image() because it throws errors when files don't exist
for survey, path in zip(survey_list, paths):
filepath = "%s%s_%s.fits" % (folder, target['full_name'], survey)
filepath = filepath.replace(' ', '_')
try:
urllib.request.urlretrieve(path, filepath)
except urllib.error.HTTPError:
if verbose:
print("%s not in %s" % (target['full_name'], survey))
pass
def get_nvss(ra, dec, size=1000, overwrite=True):
# uses skyview
# if this is failing with 404 not found
# rm ~/.astropy/cache/astroquery/SkyView/*
print('importing skyview ... this could hang...')
from astroquery.skyview import SkyView
coords = coord.SkyCoord(ra, dec, unit=(u.deg, u.deg))
filename = 'NVSS-' + coords.to_string('hmsdms').replace(' ', '') + '.fits'
if os.path.isfile(filename):
if overwrite:
print('removing ' + filename)
os.system('rm ' + filename)
else:
return filename
paths = SkyView.get_images(position=coords.to_string('hmsdms'),
survey='NVSS',
width=size * u.arcsec)
hdu = paths[0]
hdu[0].header['BMAJ'] = 45.0 / 3600.0
hdu[0].header['BMIN'] = 45.0 / 3600.0
hdu[0].header['BPA'] = 0
hdu[0].header['RESTFREQ'] = 1.4e9
hdu.writeto(filename)
return filename
def plot_sky(axes, EPIC):
# Get K2 image
tpf_file = "/home/stephanie/data/c5_tpf/ktwo{0}-c05_lpd-targ.fits.gz".format(
EPIC)
tabl, times, pixels, maskmap, maskheader, kpmag = tpf_io.get_data(tpf_file)
coadd = np.sum(pixels, axis=0)
pos = coords.SkyCoord(maskheader["RA_OBJ"],
maskheader["DEC_OBJ"],
unit=u.deg)
with fits.open(tpf_file) as hdu2:
dataheader = hdu2[1].header
# keysel = np.empty(13, "S6")
# keysel[:] = "binary"
w2 = extract_wcs(dataheader)
# Get 2MASS K image
twomass_images, pix_2mass, hdr_2mass = None, None, None
try:
twomass_images = SkyView.get_images(position=pos,
survey=['DSS2 Red'],
pixels=500)
# print(twomass_images)
if len(twomass_images) > 0:
pix_2mass = twomass_images[0][0].data
hdr_2mass = twomass_images[0][0].header
except astroquery.exceptions.TimeoutError, urllib.HTTPError:
pix_2mass, hdr_2mass = None, None
def get_skyview(survey_name, ra, dec, size):
from astroquery.skyview import SkyView
hdu = SkyView.get_images("{0},{1}".format(ra, dec),
radius=size * u.arcsecond,
survey=survey_name)[0]
image_header = hdu[0].header
return (hdu)
def __init__(self, coord, radius, mission, **kwargs):
surveycoord.SurveyCoord.__init__(self, coord, radius, **kwargs)
#
self.survey = None
self.mission = mission
# Instantiate astroquery object
self.skyview = SkyView()
def create_chart(self, path=None):
"""
Creates the finding chart
:param path: Path the save place of the finding chart
:type path: str
:return:
"""
paths = SkyView.get_images(position=self.coord,
survey=self.config.survey,
width=self.config.width,
height=self.config.height,
pixels=self.config.pixels)[0][0]
wcs = WCS(paths.header)
shape = paths.shape
fig = pl.figure(num=0)
fig.clf()
sp = fig.add_subplot(111, projection=wcs)
self.__image__(paths.data.copy(), sp)
# cross around the target
if self.config.cross:
center = wcs.all_world2pix(self.coord.ra.degree,
self.coord.dec.degree, 0)
self.__cross__(sp, shape, center)
self.__arrows__(sp, shape)
self.__scale__(sp, wcs)
if path is not None:
fig.savefig(path)
def download_data(pos, survey, filters, pxl):
"""Proxy to astroquery SkyviewService.
This functions is mostly for internal use.
Parameters
----------
pos: SkyCoord
Determines the center of the field to be retrieved.
survey: str
The data to download the survey.
filters: list
Specific astronomical filters of the data.
pxl:
Selects the pixel dimensions of the image to be produced.
Returns
-------
A list of `~astropy.io.fits.HDUList` objects.
"""
path = SkyView.get_images(
position=pos,
survey=survey + str(filters),
radius=2 * apu.arcmin,
pixels=(pxl, pxl),
coordinates=DOWNLOAD_COORDINATE_SYSTEM,
show_progress=DOWNLOAD_SHOW_PROGRESS,
)
return path
def call_skyview_simple(survey, source_name, fov=1):
"""Call Skyview to download data from a survey based on input parameters
Args:
survey (str): name of survey, from https://skyview.gsfc.nasa.gov/current/cgi/survey.pl
source (str): name of astronomical source
fov (float): FOV in degrees
Examples:
>>> call_skyview('DSS', 'M31', 2.)
>>> call_skyview('NVSS', NGC6670, 0.5)
"""
coords = coords_from_name(source_name)
outname = f'{source_name}_{survey}_{fov}d.fits'
images = SkyView.get_images(coords,
survey,
coordinates='J2000',
projection='Car',
pixels=500,
height=fov * u.deg,
width=fov * u.deg)
fitsname = f'images/{source_name}_{survey}_{fov}d.fits'
try:
images[0][0].writeto(fitsname, overwrite=True)
except astropy.io.fits.verify.VerifyError:
print('Data not available')
pass
return fitsname
def image(ra, dec, sur):
from astropy import coordinates, units as u, wcs
from astroquery.skyview import SkyView
from astropy.io import fits
from astropy.io.fits import getdata
import aplpy
from matplotlib.pyplot import *
import numpy as np
from matplotlib import gridspec
import matplotlib.pyplot as plt
center = coordinates.SkyCoord(str(ra) + ' ' + str(dec),
frame='icrs',
unit='deg')
rad = 60 * u.arcsecond
images = SkyView.get_images(position=center, survey=[sur], radius=rad)
x = np.zeros(1)
y = np.zeros(1)
r = np.zeros(1)
x[0] = (ra)
y[0] = (dec)
r[0] = (0.00139)
fig = aplpy.FITSFigure(images[0])
fig.show_colorscale(cmap='gist_heat')
fig.show_circles(x, y, r, color='g', alpha=1, lw=4)
fig.recenter(ra, dec, radius=0.00416)
fig.axis_labels.hide()
fig.tick_labels.hide()
fig.savefig(sur + '.png')
def _get_skyview_cutout(self):
"""Fetch cutout data via SkyView API."""
sv = SkyView()
path = cutout_cache + self.survey + '/{:.3f}arcmin_{:.3f}_{:.3f}.fits'
path = path.format(self.radius * 60, self.ra, self.dec)
progress = self.kwargs.get('progress', False)
if not os.path.exists(path):
skyview_key = SURVEYS.loc[self.survey].sv
try:
hdul = sv.get_images(position=self.position,
survey=[skyview_key],
radius=self.radius * u.deg,
show_progress=progress)[0][0]
except IndexError:
raise FITSException('Skyview image list returned empty.')
except ValueError:
raise FITSException(
f'{self.survey} is not a valid SkyView survey.')
except HTTPError:
raise FITSException('No response from Skyview server.')
with open(path, 'wb') as f:
hdul.writeto(f)
with fits.open(path) as hdul:
self.header, self.data = hdul[0].header, hdul[0].data
self.wcs = WCS(self.header, naxis=2)
try:
self.mjd = Time(self.header['DATE']).mjd
except KeyError:
try:
self.epoch = self.kwargs.get('epoch')
msg = "Could not detect epoch, PM correction disabled."
assert self.epoch is not None, msg
self.mjd = self.epoch if self.epoch > 3000 else Time(
self.epoch, format='decimalyear').mjd
except AssertionError as e:
if self.kwargs.get('pm'):
self.logger.warning(e)
self.mjd = None
self.data *= 1000
def genSimulation(configpath, star, orders = [-1,0,1], seeing = 1):
""""Generates the arguments for plot_all to simulate the spectrogram of star through a slitless spectrogram which properties are contained in the configuration file.
Parameters
----------
configpath : string
path to the slitless spectrograph configutation file
star : string
the studied star identifier
orders : list of integers
the list of orders to represent.
seeing : float
the wanted seeing for the spectrogram in arcseconds, 1 arcsec by default
Returns
-------
stars : list
a list of star_class objects, containing the stars to take into account with their position on the captor,
img : 2d ndarray
a background image for the stars,
angle : float
the angle of dispersion used for the spectrogram,
config : configuration
the configuration used for the spectrogram,
LTh : list
a list of angles for Overlap_list,
Overlap_list : list
the list of the total overlap caused by surrounding stars on the studied star spectrum
"""
config = configuration(configpath)
imsize, pix2ars = config.ccd_imsize, config.pixel2arcsec
query = customSimbad.query_object(star)
ra0, dec0, mag0 = query["RA_d"][0], query["DEC_d"][0], query["FLUX_V"][0]
r = 2*imsize*config.pixel2arcsec/3600
maglim = mag0 + 7.5
job = Gaia.launch_job_async("SELECT ra, dec, DISTANCE(POINT('ICRS', ra, dec),POINT('ICRS', {0}, {1})) AS dist, phot_g_mean_mag AS flux FROM gaiadr2.gaia_source WHERE CONTAINS(POINT('ICRS', ra, dec),CIRCLE('ICRS', {0}, {1}, {2})) = 1 AND phot_g_mean_mag < {3} ORDER BY dist".format(ra0, dec0, r, maglim))
result = job.get_results()
ra0, dec0 = result['ra'][0], result['dec'][0]
config.wcs.wcs.crval = [ra0,dec0]
cra, cdec = config.wcs.wcs_pix2world([[imsize/2, imsize/2]], 0)[0]
stars = list_stars(result,config,maglim,seeing, orders)
angle, LTh, Overlap_list = best_angle(stars, config)
for star in stars :
star.rotate_orders(angle, use_radians = True)
LTh = LTh*180/np.pi
img = SkyView.get_images(position = '{}, {}'.format(cra, cdec), survey = 'DSS', width = imsize*pix2ars*u.arcsec, height = imsize*pix2ars*u.arcsec)[0][0].data
return (stars, img, angle, config, LTh, Overlap_list)
def show_guide_camera(npointing,south_camera=True,offset_ra=0,offset_dec=0,plotsingle=True):
'''
offset_ra in arcsec
offset_dec in arcsec
camera = 0 for south
camera = 1 for north
'''
i = npointing-1
if south_camera:
# South camera
delta_ra = -25./3600
delta_dec = -2410./3600
width_ra = 3.3/60.
width_dec = 2.2/60.
outputfile=outfile_prefix+'Pointing%02d-guiding-south.png'%(npointing)
mytitle = "Pointing %02d South Camera (3.3'x2.2'): NSAID %i"%((i+1),pointing_id[i])
else:
# offsets and dimensions of
# North camera
delta_ra = 0
delta_dec = 2610./3600
width_ra = 3.3/60.
width_dec = 2.2/60.
outputfile=outfile_prefix+'Pointing%02d-guiding-north.png'%(npointing)
mytitle = "Pointing %02d North Camera (3.3'x2.2'): NSAID %i"%((i+1),pointing_id[i])
center_ra = pointing_ra[i]+offset_ra/3600. + delta_ra
center_dec = pointing_dec[i] + offset_dec/3600. + delta_dec
delta_image = width_ra
if plotsingle:
plt.figure(figsize=(6,6))
ax = plt.gca()
pos = coords.SkyCoord(center_ra,center_dec,frame='icrs',unit='degree')
xout = SkyView.get_images(pos,survey=['DSS'],height=2*delta_image*u.degree,width=2.*delta_image*u.degree)
b=xout[0][0]
ax.imshow(xout[0][0].data,interpolation='none',aspect='equal',cmap='gray_r',extent=[b.header['CRVAL1']-(b.header['NAXIS1']-b.header['CRPIX1'])*b.header['CDELT1'],
b.header['CRVAL1']+(b.header['NAXIS1']-b.header['CRPIX1'])*b.header['CDELT1'],
b.header['CRVAL2']+(b.header['NAXIS2']-b.header['CRPIX2'])*b.header['CDELT2'],
b.header['CRVAL2']-(b.header['NAXIS2']-b.header['CRPIX2'])*b.header['CDELT2']])
rect= plt.Rectangle((center_ra - 0.5*width_ra,center_dec - 0.5*width_dec), width_ra, width_dec,fill=False, color='k')
plt.gca().add_artist(rect)
if plotsingle:
plt.title(mytitle)
else:
if south_camera:
plt.title("South Camera (3.3'x2.2')")
else:
plt.title("North Camera (3.3'x2.2')")
plt.xlabel('RA (deg)')
plt.ylabel('DEC (deg)')
plt.gca().invert_yaxis()
if plotsingle:
plt.savefig(outputfile)
def main():
ap = argparse.ArgumentParser(description='Get contextual imagery')
ap.add_argument('--size',
type=float,
default=1000.,
help='The size of the images to fetch, in arcseconds.')
ap.add_argument('surveys',
help='Comma-separated list of surveys to query.')
ap.add_argument(
'outdir',
help='The directory in which to save the downloaded FITS files.')
settings = ap.parse_args()
surveys = settings.surveys.split(',')
sv = SkyView()
for name, ra_deg, dec_deg in TARGETS:
for survey in surveys:
print(name, survey, '...')
hdulists = sv.get_images(
position=f'{ra_deg} {dec_deg}',
survey=survey,
projection='Tan',
width=settings.size * u.arcsec,
height=settings.size * u.arcsec,
#pixels = 300 # which produces JPEG images of 40 KB
#pixels = 1000 # which produces JPEG images of 300 KB
pixels=
2000 #which produces JPEG images of 300 KB to 1.2 MB depending on the richness of the region
)
if len(hdulists) == 0:
print(f'warning: no images for {name}', file=sys.stderr)
continue
if len(hdulists) > 1:
print(f'warning: multiple images for {name}', file=sys.stderr)
hdulists[0].writeto(
os.path.join(settings.outdir, f'{name}_{survey}.fits'))
def get_surveys(self, survey_list, field_side_length):
"""
Center: skycoord coordinate+
survey_list: list or iterable consisting of strings in the form of SkyView surveynames.
Full description of all the surveys availible can be found here:
https://skyview.gsfc.nasa.gov/current/cgi/survey.plhttps://skyview.gsfc.nasa.gov/current/cgi/survey.pl
Some surveynames are:
"2MASS-J"
"2MASS-H"
"2MASS-K"
"WISE 3.4"
"WISE 4.6"
"WISE 12"
"WISE 22"
"DSS"
"SDSSg"
"SDSSi"
"SDSSr"
"SDSSu"
"SDSSz"
Returns a list of astropy.fits.HDUList objects. All elements of this
list have an attribute "".data" that can be passed to plt.imshow().
"""
print("Fetching surveys:")
print(survey_list)
print("With radius:")
print(field_side_length)
center = self.ra + self.dec
return (SkyView.get_images(position=center,
survey=survey_list,
radius=(field_side_length)))
def get_skyview(survey_name,ra,dec,size):
from astroquery.skyview import SkyView
pstg_stamp=SkyView.get_images("{0},{1}".format(ra,dec),radius=size*u.arcsecond,survey=survey_name)[0]
image_header=pstg_stamp[0].header
# print(image_header)
if survey_name == 'NVSS':
image_header['BMAJ']=0.0125
image_header['BMIN']=0.0125
image_header['BPA']=0
# pstg_stamp.writeto(path_to_save_dir+viewer_surveys()[i]+'_{0}.fits'.format(size),overwrite=True)
return(pstg_stamp)
def get_dss_image(shape, wcs, survey='DSS'):
'''Use astroquery SkyView to get a DSS image projected to wcs and shape.'''
shape = np.array(shape)
platescale = proj_plane_pixel_scales(wcs)
ra, dec = wcs.wcs_pix2world(*(shape / 2), 0)
sk = SkyCoord(ra, dec, unit=('degree', 'degree'), frame='icrs')
im = SkyView.get_images(sk,
survey='DSS',
coordinates='ICRS',
width=shape[0] * platescale[0] * u.degree,
height=shape[1] * platescale[1] * u.degree)[0]
im = reproject_interp(im[0], output_projection=wcs, shape_out=shape)[0]
return im
def get_sdss_sky_image(img_center, fov=9 * u.deg, n_pix=1000):
'''
A small helper method which uses astroquery to get an image from the sdss.
This requires internet access and fails pretty often due to http timeouts.
'''
hdu = SkyView.get_images(position=img_center,
pixels=n_pix,
survey=['DSS'],
width=fov,
height=fov)[0][0]
img = hdu.data
wcs = WCS(hdu.header)
return img, wcs
def get_nvss(ra, dec, size=1000):
# uses skyview
coords = coord.SkyCoord(ra, dec, unit=(u.deg, u.deg))
paths = SkyView.get_images(position=coords.to_string('hmsdms'),
survey='NVSS',
width=size * u.arcsec)
hdu = paths[0]
hdu[0].header['BMAJ'] = 45.0 / 3600.0
hdu[0].header['BMIN'] = 45.0 / 3600.0
hdu[0].header['BPA'] = 0
hdu[0].header['RESTFREQ'] = 1.4e9
filename = 'NVSS-' + coords.to_string('hmsdms').replace(' ', '') + '.fits'
hdu.writeto(filename)
return filename
def download_image(coords, surveys, name='field', radius=None, width=None, height=None):
print('Getting fitsfiles')
fitsfiles = SkyView.get_images(position=coords,
survey=surveys,
radius=radius,
width=width,
height=height)
os.system('mkdir catalogs')
for fitsfile, survey in zip(fitsfiles, surveys):
print('Writing to file: {0} ...'.format(survey), end='')
filename = f'./catalogs/{name}_{survey}.fits'.replace(' ', '_')
try:
fitsfile[0].writeto(filename, overwrite=True)
print('...Done')
except astropy.io.fits.verify.VerifyError:
print('...Failed')
def getSVImg(SC_ObjPos, SkyViewSurvey):
"""
Input: a SkyCoord Position Vector and a Survey Type that is Compatable with NASA SkyView
Output: A Numpy Pixel Array and Header Array
"""
img_survey, pix_survey, hdr_survey = None, None, None
try:
img_survey = SkyView.get_images(position=SC_ObjPos,
survey=[SkyViewSurvey],
coordinates="J2000",
pixels=30)
if len(img_survey) > 0:
pix_survey = img_survey[0][0].data
hdr_survey = img_survey[0][0].header
except astroquery.exceptions.TimeoutError, urllib.HTTPError:
pix_survey, hdr_survey = None, None
def Planck_SkyView(name, ra, dec, width, band, bands_dict, temp_dir):
print('Querying for Planck ' + bands_dict[band]['wavelength'] +
'um data for ' + name + ' from NASA SkyView')
position_string = str(ra) + ' ' + str(dec)
query_success = None
pix_size = bands_dict[band]['pix_size']
# Add tiny permutation to width to stop SkyView flailing over repeat queries
width *= 1.0 + (0.01 * (np.random.rand() - 0.5))
# Perform query
while query_success == None:
try:
query_filename = os.path.join(
temp_dir,
name + '_Planck_' + bands_dict[band]['wavelength'] + '.fits')
query_url = SkyView.get_image_list(
position_string,
bands_dict[band]['band_name'],
deedger='_skip_',
pixels=int((width * 3600.0) / pix_size),
radius=astropy.units.Quantity(width, unit='deg'))
if len(query_url) != 1:
pdb.set_trace()
query_success = True
except:
query_success = False
# Retrieve and verify data
if query_success:
print('Retrieving identified Planck ' +
bands_dict[band]['wavelength'] + 'um data for ' + name)
Planck_wget(str(query_url[0]), query_filename)
try:
astropy.io.fits.info(query_filename)
except Exception:
query_success = False
pdb.set_trace()
# If no data available, generate null file and report failure
if not query_success:
os.system('touch ' + os.path.join(
temp_dir, '.' + name + '_Planck_' +
bands_dict[band]['wavelength'] + '.null'))
print('No ' + band + ' data for ' + name)
def get_image_index():
cache = get_cache_dir()
ast_data = os.path.dirname(_solve_field)
ast_data = os.path.dirname(ast_data)
ast_data = os.path.join(ast_data, 'data')
os.makedirs(ast_data, exist_ok=True)
index = 'index-4107.fits' # index-4202-28.fits'
d = 'http://broiler.astrometry.net/~dstn/4100/' + index
f = os.path.join(ast_data, index)
if not os.path.isfile(f):
request.urlretrieve(d, f) # nosec
name = os.path.join(cache, 'm20_dss.fits')
if not os.path.isfile(name):
s = SkyView.get_images('M20',
radius=Angle('60arcmin'),
pixels=2048,
survey='DSS')
s[0][0].writeto(name)
return name, f
def get_asset_data(self, path: str) -> bytes:
"""
Return data for a non-collection asset at the given path
:param path: asset path; must identify a non-collection asset
:return: asset data
"""
survey, position, width, height = self._get_asset_params(path)
try:
res = SkyView.get_images(
position, **self._get_query_args(survey, width, height))
except Exception as e:
raise AssetNotFoundError(path=path, reason=str(e))
if not res:
raise AssetNotFoundError(path=path,
reason='No images returned by SkyView')
buf = BytesIO()
res[0].writeto(buf, output_verify='silentfix+ignore')
return buf.getvalue()
def Planck_SkyView(name, ra, dec, width, band, bands_dict, out_dir):
print('Retrieving ' + band + ' data for ' + name + ' from NASA SkyView')
position_string = str(ra) + ' ' + str(dec)
query_success = None
query_reattempt = False
pix_size = bands_dict[band]['pix_size']
# Perform query
while query_success == None:
try:
query_filename = os.path.join(
out_dir,
name + '_Planck_' + bands_dict[band]['wavelength'] + '.fits')
query_url = SkyView.get_image_list(
position_string,
bands_dict[band]['band_name'],
deedger='_skip_',
pixels=str(int((width * 3600.0) / pix_size)),
radius=astropy.units.Quantity(width, unit='deg'))
if len(query_url) != 1:
pdb.set_trace()
query_success = True
except:
query_success = False
# Retrieve and verify data
if query_success:
print('Retrieving identified Planck ' + band + ' data for ' + name)
Planck_wget(str(query_url[0]), query_filename)
try:
astropy.io.fits.info(query_filename)
except Exception as exception:
if exception.message == 'Empty or corrupt FITS file':
pdb.set_trace()
else:
pdb.set_trace()
# Report failure
if not query_success:
print('No Planck ' + band + ' data for ' + name)
pdb.set_trace()
def get_url(coords, surveys, radius=None, width=None, height=None):
print('Reading urls')
urls = []
valid_surveys = []
missing_surveys = []
for survey in surveys:
url = SkyView.get_image_list(position=coords,
survey=survey,
radius=radius,
width=width,
height=height)
if url != []:
if requests.get(url[0]).status_code != 404:
urls.append(url)
valid_surveys.append(survey)
print('OK: ', survey)
else:
missing_surveys.append(survey)
print('Failed: ', survey)
for u,s in zip(urls, valid_surveys):
print(u,s)
return urls, valid_surveys, missing_surveys
def retrieve_image_SkyView(ra, dec, size, scale, logger):
size_pix = min(512, int(size * 3600. / scale))
scale = size * 3600. / size_pix
paths = SkyView.get_images(position='%3.5f %2.5f' % (ra, dec),
survey='DSS2 Blue',
coordinates='J2000',
height=size * aunit.deg,
width=size * aunit.deg,
pixels=str(size_pix),
cache=False)
if paths:
hdu = paths[0][0].header
imarray = paths[0][0].data
imarray = imarray[::-1, :]
CD = numpy.matrix([[hdu['CDELT1'], 0], [0, hdu['CDELT2']]])
else:
# Default to PS1
logger.warning(
"Could not contact SDSS or DSS. Falling back to PS1!")
return retrieve_image_PS1(ra, dec, size, scale, logger)
return imarray, CD, '', 'DSS2'
def DownloadImage(RA, DEC, outputfolder):
Pos = RA_convert(RA) + "," + DEC_convert(DEC)
print(RA, DEC)
print(Pos)
img = SkyView.get_images(position=Pos,
survey=['DSS2 Blue', 'DSS2 IR', 'DSS2 Red'],
pixels='50,50',
coordinates='J2000',
grid=True,
gridlabels=True)
#img = SkyView.get_images(position='22:57:00,62:38:00',survey=['DSS2 Blue','DSS2 IR','DSS2 Red'],pixels='100,100',coordinates='J2000',grid=True,gridlabels=True)
fig, ax = pl.subplots(ncols=3, figsize=(24, 8))
plot = ax[0].imshow(img[0][0].data,
vmax=np.max(img[0][0].data) * .65,
vmin=np.max(img[2][0].data) * .45)
plot1 = ax[1].imshow(img[1][0].data,
vmax=np.max(img[1][0].data) * .75,
vmin=np.max(img[1][0].data) * .4)
plot2 = ax[2].imshow(img[2][0].data,
vmax=np.max(img[2][0].data) * .485,
vmin=np.max(img[2][0].data) * .25)
pl.savefig(outputfolder + "/SkyImage.png")
def asteroids_plot(self,
image_path=None,
ra=None,
dec=None,
odate=None,
time_travel=1,
radi=6,
max_mag=20.0,
circle_color='yellow',
arrow_color='red'):
"""
Source plot module.
@param image_path: data part of the FITS image
@type image_path: numpy array
@param ra: RA coordinate of target area.
@type ra: str in "HH MM SS"
@param dec: DEC coordinate of target area
@type dec: str in "+DD MM SS"
@param radi: Radius in arcmin.
@type radi: float
@param odate: Ephemeris date of observation in date
@type odate: "2017-08-15T19:50:00.95" format in str
@param time_travel: Jump into time after given date (in hour).
@type time_travel: float
@param max_mag: Limit magnitude to be queried object(s)
@type max_mag: float
@param circle_color: Color of the asteroids marks
@type circle_color: str
@param arrow_color: Color of the asteroids direction marks
@type arrow_color: str
@returns: boolean
"""
from .catalog import Query
# filename = get_pkg_data_filename(image_path)
rcParams['figure.figsize'] = [15., 12.]
# rcParams.update({'font.size': 10})
if image_path:
hdu = fits.open(image_path)[0]
elif not image_path and ra and dec and odate:
co = coordinates.SkyCoord('{0} {1}'.format(ra, dec),
unit=(u.hourangle, u.deg),
frame='icrs')
print('Target Coordinates:',
co.to_string(style='hmsdms', sep=':'),
'in {0} arcmin'.format(radi))
try:
server_img = SkyView.get_images(position=co,
survey=['DSS'],
radius=radi * u.arcmin)
hdu = server_img[0][0]
except Exception as e:
print("SkyView could not get the image from DSS server.")
print(e)
raise SystemExit
wcs = WCS(hdu.header)
data = hdu.data.astype(float)
bkg = sep.Background(data)
# bkg_image = bkg.back()
# bkg_rms = bkg.rms()
data_sub = data - bkg
m, s = np.mean(data_sub), np.std(data_sub)
ax = plt.subplot(projection=wcs)
plt.imshow(data_sub, interpolation='nearest',
cmap='gray', vmin=m - s, vmax=m + s, origin='lower')
ax.coords.grid(True, color='white', ls='solid')
ax.coords[0].set_axislabel('Galactic Longitude')
ax.coords[1].set_axislabel('Galactic Latitude')
overlay = ax.get_coords_overlay('icrs')
overlay.grid(color='white', ls='dotted')
overlay[0].set_axislabel('Right Ascension (ICRS)')
overlay[1].set_axislabel('Declination (ICRS)')
sb = Query()
ac = AstCalc()
if image_path:
fo = FitsOps(image_path)
if not odate:
odate = fo.get_header('date-obs')
else:
odate = odate
ra_dec = ac.center_finder(image_path, wcs_ref=True)
elif not image_path and ra and dec and odate:
odate = odate
ra_dec = [co.ra, co.dec]
request0 = sb.find_skybot_objects(odate,
ra_dec[0].degree,
ra_dec[1].degree,
radius=radi)
if request0[0]:
asteroids = request0[1]
elif request0[0] is False:
print(request0[1])
raise SystemExit
request1 = sb.find_skybot_objects(odate,
ra_dec[0].degree,
ra_dec[1].degree,
radius=float(radi),
time_travel=time_travel)
if request1[0]:
asteroids_after = request1[1]
elif request1[0] is False:
print(request1[1])
raise SystemExit
for i in range(len(asteroids)):
if float(asteroids['m_v'][i]) <= max_mag:
c = coordinates.SkyCoord('{0} {1}'.format(
asteroids['ra(h)'][i],
asteroids['dec(deg)'][i]),
unit=(u.hourangle, u.deg),
frame='icrs')
c_after = coordinates.SkyCoord('{0} {1}'.format(
asteroids_after['ra(h)'][i],
asteroids_after['dec(deg)'][i]),
unit=(u.hourangle, u.deg),
frame='icrs')
r = FancyArrowPatch(
(c.ra.degree, c.dec.degree),
(c_after.ra.degree, c_after.dec.degree),
arrowstyle='->',
mutation_scale=10,
transform=ax.get_transform('icrs'))
p = Circle((c.ra.degree, c.dec.degree), 0.005,
edgecolor=circle_color,
facecolor='none',
transform=ax.get_transform('icrs'))
ax.text(c.ra.degree,
c.dec.degree - 0.007,
asteroids['name'][i],
size=12,
color='black',
ha='center',
va='center',
transform=ax.get_transform('icrs'))
r.set_facecolor('none')
r.set_edgecolor(arrow_color)
ax.add_patch(p)
ax.add_patch(r)
# plt.gca().invert_xaxis()
plt.gca().invert_yaxis()
plt.show()
print(asteroids)
return True
from astropy import units as u
from astropy import coordinates
import pylab as pl
import aplpy
# Retrieve OrionKL 2MASS K-band image:
# In[92]:
orionkl_coords = coordinates.SkyCoord.from_name('Orion KL')
# In[93]:
orionkl_images = SkyView.get_images(position='Orion KL', survey=['2MASS-K'], pixels=500)
orionkl_images
# Retrieve ALMA archive information *including* private data and non-science fields:
#
# In[94]:
orionkl = Alma.query_region(coordinate=orionkl_coords, radius=4*u.arcmin, public=False, science=False)
# In[95]:
orionkl
import numpy as np
from astroquery.alma import Alma
from astroquery.skyview import SkyView
import string
from astropy import units as u
from astropy.io import fits
from astropy import wcs
from astropy import log
import pylab as pl
import aplpy
import pyregion
# Retrieve M83 2MASS K-band image:
m83_images = SkyView.get_images(position='M83', survey=['2MASS-K'],
pixels=1500)
# Retrieve ALMA archive information *including* private data and non-science
# fields:
m83 = Alma.query_object('M83', public=False, science=False)
# Parse components of the ALMA data. Specifically, find the frequency support
# - the frequency range covered - and convert that into a central frequency for
# beam radius estimation.
def parse_frequency_support(frequency_support_str):
supports = frequency_support_str.split("U")
freq_ranges = [(float(sup.strip('[] ').split("..")[0]),
float(sup.strip('[] ')
.split("..")[1]
.split(', ')[0]
survey = imgparms['survey']
projection = imgparms['projection']
pixels = imgparms['pixels']
action = imgparms['action']
overwrite = imgparms['overwrite']
if action.lower() == 'download':
failure_count = 0
failed_coords = []
for ii,ind in enumerate(select_ind):
radec_hmsdms = coords[ind].to_string('hmsdms')
outfname = outdir + '{0}_{1[0]:0d}x{1[1]:0d}.fits'.format(radec_hmsdms.replace(' ',''), pixels)
if (not os.path.isfile(outfname)) or overwrite:
try:
paths = SkyView.get_images(radec_hmsdms, survey=survey, pixels=pixels, coordinates=coordinfo['epoch'], projection=projection)
hdulist = paths[0][0]
hdulist.writeto(outfname, overwrite=True, output_verify='warn')
print('Successfully saved {0} [{1:0d}/{2:0d}]'.format(outfname, ii+1, select_ind.size))
except Exception as err:
warnings.warn('Problem with retrieving image at {0}.\nEncountered error: {1}.\nProceeding to the next object...\n'.format(radec_hmsdms, err.message), Warning)
if isinstance(err, AttributeError):
# For some reason, timeouts come under Attribute Error.
# There will be retries on these failures, but not others
# such as pointing outside the survey area, etc.
failure_count += 1
failed_coords += [radec_hmsdms]
if failure_count > 0:
from astropy import coordinates, units as u, wcs
from astroquery.skyview import SkyView
from astroquery.vizier import Vizier
import pylab as pl
center = coordinates.SkyCoord.from_name('Orion KL')
# Grab an image from SkyView of the Orion KL nebula region
imglist = SkyView.get_images(position=center, survey='2MASS-J')
# the returned value is a list of images, but there is only one
img = imglist[0]
# 'img' is now a fits.HDUList object; the 0th entry is the image
mywcs = wcs.WCS(img[0].header)
fig = pl.figure(1)
fig.clf() # just in case one was open before
# use astropy's wcsaxes tool to create an RA/Dec image
ax = fig.add_axes([0.15, 0.1, 0.8, 0.8], projection=mywcs)
ax.set_xlabel("RA")
ax.set_ylabel("Dec")
ax.imshow(img[0].data, cmap='gray_r', interpolation='none', origin='lower',
norm=pl.matplotlib.colors.LogNorm())
# retrieve a specific table from Vizier to overplot
tablelist = Vizier.query_region(center, radius=5*u.arcmin,
catalog='J/ApJ/826/16/table1')
# again, the result is a list of tables, so we'll get the first one
source_common_name = input('Common name of source: ')
source_coordinates = get_icrs_coordinates(source_common_name)
#Module for manual entry of target coordinates.
if input_is_coords == 1:
source_coords = input('Source coordinates as ra_deg,dec_deg: ')
source_ra = float(source_coords.split(',')[0])
source_dec = float(source_coords.split(',')[1])
source_coordinates = SkyCoord(source_ra, source_dec, unit=u.deg)
#Execute astroquery for the DSS image with the requested number of pixels.
if input_is_coords == 1:
dss_image = SkyView.get_images(
position=source_coords, survey='DSS', pixels=str(dss_pixel_size)
) #Use this line for the dss query if the input is manual coor#Use this line for thedinates in decimal degrees.
if input_is_name == 1:
dss_image = SkyView.get_images(
position=source_coordinates, survey='DSS', pixels=str(dss_pixel_size)
) #Use this line for the dss query if the input is the source's common name.
dss_image_data = dss_image[0][0].data
dss_pixmin = np.min(dss_image_data)
dss_pixmax = np.max(dss_image_data)
wcs_dss = WCS(dss_image[0][0].header)
#Create the sector masks by allowing user to click the desired pixels, one sector at a time.
cutlist = get_multi_cutout_lst(source_coordinates, sz=(xsize, ysize))
def plot_image(ra=None, dec=None, pos=None, **kwargs):
"""
Use SkyView to get a cutout image
:param ra: float or string or None, right ascension (deg or hh:mm:ss)
:param dec: float or string or None, declination (deg or dd:mm:ss)
:param pos: string or None,
Determines the center of the field to be retrieved. Both
coordinates (also equatorial ones) and object names are
supported. Object names are converted to coordinates via the
SIMBAD or NED name resolver. See the reference for more info
on the supported syntax for coordinates.
:param kwargs: see below
kwargs are as follows
- coords
Choose among common equatorial, galactic and ecliptic
coordinate systems ("J2000", "B1950", "Galactic",
"E2000", "ICRS") or pass a custom string.
- survey string, surveys used in SkyView.get_images
define survey (can find info in SkyView.list_surveys())
e.g.:
SDSSg, SDSSi, SDSSr, SDSSu, SDSSz, 2MASS-J, 2MASS-H,
2MASS-K, UKIDSS-Y, UKIDSS-J, UKIDSS-H, UKIDSS-K,
WISE 3.4, WISE 4.6, WISE 12, WISE 22
if colour kwarg is True this is a list of three strings
and is from red --> blue i.e. ['WISE 12', 'WISE 4.6', 'WISE 3.4']
- radius
float, half width of image
- pixels
int, size of the image produced in pixels (for x and y)
- colour
bool, whether to plot rgb or not, default=False
- cmap
string, matplotlib colormap indicator
(used if not rgb), default='gist_gray'
- stretches
tuple, defines the rgb stretches to use on rgb plot
[stretch in r, stretch in g, stretch in b]
default is ['log', 'log', 'log'] can have:
'linear', 'log', 'sqrt', 'arcsinh', 'power'
- gridc
string, colour of the grid
- gridl
string, linestyle of the grid
:return:
"""
# load params from kwargs
coords = kwargs.get('coords', 'J2000')
s = kwargs.get('survey', '2MASS-J')
radius = kwargs.get('radius', 1.0 * u.deg)
pixels = kwargs.get('pixels', 1024)
colour = kwargs.get('colour', False)
cmap = kwargs.get('cmap', 'gist_gray')
stretches = kwargs.get('stretches', ('log', 'log', 'log'))
gridc = kwargs.get('gridc', '0.75')
gridl = kwargs.get('gridl', '--')
# get position as ra dec string
if ra is not None and dec is not None:
pos = '{0} {1}'.format(ra, dec)
elif pos is not None:
pos = pos
else:
raise Exception('Error need RA, Dec or Pos to get image')
# download images
giargs = dict(position=pos, survey=s, radius=radius, pixels=pixels,
coordinates=coords)
images = SkyView.get_images(**giargs)
# plot aplpy FITS figure
apx = aplpy.FITSFigure(images[0][0])
# if colour expect 3 surveys and make an rgb plot
if colour:
files = []
# loops round each image
for i, j in enumerate(images):
# defines a tmp filename for each iamge
fname = '{0}.fits'.format(i)
# writes fits to file
j[0].writeto(fname, clobber=True)
# appends filename to file list
files.append(fname)
# add rgb image to file list
files.append('rgb.png')
# create rgb image
rgbargs = dict(zip(['stretch_r', 'stretch_g', 'stretch_b'], stretches))
aplpy.make_rgb_image(files[:3], files[3], **rgbargs)
# show rgb plot on top
apx.show_rgb('rgb.png')
for fn in files:
os.remove(fn)
# if not colour just show the colour scale
else:
apx.show_colorscale(cmap=cmap)
# add grid
apx.add_grid()
apx.grid.set_color(gridc)
apx.grid.set_linestyle(gridl)
# return aplpy figure
return apx
def plot_finder_image(target, survey='DSS', fov_radius=10*u.arcmin,
log=False, ax=None, grid=False, reticle=False,
style_kwargs=None, reticle_style_kwargs=None):
"""
Plot survey image centered on ``target``.
Survey images are retrieved from NASA Goddard's SkyView service via
`~astroquery.skyview.SkyView`, and plotted using WCSAxes.
If a `~matplotlib.axes.Axes` object already exists, plots the finder image
on top. Otherwise, creates a new `~matplotlib.axes.Axes`
object with the finder image.
Parameters
----------
target : `~astroplan.FixedTarget`, `~astropy.coordinates.SkyCoord`
Coordinates of celestial object
survey : string
Name of survey to retrieve image from. For dictionary of
available surveys, use
`from astroquery.skyview import SkyView; print(SkyView.survey_dict)`.
Defaults to `'DSS'`, the Digital Sky Survey.
fov_radius : `~astropy.units.Quantity`
Radius of field of view of retrieved image. Defaults to 10 arcmin.
log : bool, optional
Take the natural logarithm of the FITS image if `True`.
False by default.
ax : `~matplotlib.axes.Axes` or None, optional.
The `~matplotlib.axes.Axes` object to be drawn on.
If None, uses the current `~matplotlib.axes.Axes`.
grid : bool, optional.
Grid is drawn if `True`. `False` by default.
reticle : bool, optional
Draw reticle on the center of the FOV if `True`. Default is `False`.
style_kwargs : dict or `None`, optional.
A dictionary of keywords passed into `~matplotlib.pyplot.imshow`
to set plotting styles.
reticle_style_kwargs : dict or `None`, optional
A dictionary of keywords passed into `~matplotlib.pyplot.axvline` and
`~matplotlib.pyplot.axhline` to set reticle style.
Returns
-------
ax : `~matplotlib.axes.Axes`
Matplotlib axes with survey image centered on ``target``
hdu : `~astropy.io.fits.PrimaryHDU`
FITS HDU of the retrieved image
"""
import matplotlib.pyplot as plt
from astroquery.skyview import SkyView
coord = target if not hasattr(target, 'coord') else target.coord
position = coord.icrs
coordinates = 'icrs'
target_name = None if isinstance(target, SkyCoord) else target.name
hdu = SkyView.get_images(position=position, coordinates=coordinates,
survey=survey, radius=fov_radius, grid=grid)[0][0]
wcs = WCS(hdu.header)
# Set up axes & plot styles if needed.
if ax is None:
ax = plt.gca(projection=wcs)
if style_kwargs is None:
style_kwargs = {}
style_kwargs = dict(style_kwargs)
style_kwargs.setdefault('cmap', 'Greys')
style_kwargs.setdefault('origin', 'lower')
if log:
image_data = np.log(hdu.data)
else:
image_data = hdu.data
ax.imshow(image_data, **style_kwargs)
# Draw reticle
if reticle:
pixel_width = image_data.shape[0]
inner, outer = 0.03, 0.08
if reticle_style_kwargs is None:
reticle_style_kwargs = {}
reticle_style_kwargs.setdefault('linewidth', 2)
reticle_style_kwargs.setdefault('color', 'm')
ax.axvline(x=0.5*pixel_width, ymin=0.5+inner, ymax=0.5+outer,
**reticle_style_kwargs)
ax.axvline(x=0.5*pixel_width, ymin=0.5-inner, ymax=0.5-outer,
**reticle_style_kwargs)
ax.axhline(y=0.5*pixel_width, xmin=0.5+inner, xmax=0.5+outer,
**reticle_style_kwargs)
ax.axhline(y=0.5*pixel_width, xmin=0.5-inner, xmax=0.5-outer,
**reticle_style_kwargs)
# Labels, title, grid
ax.set(xlabel='RA', ylabel='DEC')
if target_name is not None:
ax.set_title(target_name)
ax.grid(grid)
# Redraw the figure for interactive sessions.
ax.figure.canvas.draw()
return ax, hdu
def finding_charts(target, observer, start,
surveys=['SDSSr', 'DSS Red', 'DSS'],
text=None, size=15, step=1, lstep=6, number=25,
lformat='%H:%M', alpha=0.5, lalpha=1, **kwargs):
"""Generate finding charts for a moving target.
The downloaded images are saved as gzipped FITS with a name based
on the ephemeris position. If an image has already been
downloaded for an ephemeris position, then it will read the file
instead of fetching a new one.
The finding charts are saved with the RA, Dec, and time of the
center ephemeris point.
Parameters
----------
target : string
Target designation.
observer : string
Observer location.
date : array-like of string
Start date for the finding charts. Processed with
`astropy.time.Time`.
surveys : array-like, optional
List of surveys to display in order of preference. See
`astroquery.skyview`.
size : int, optional
Field of view in arcmin.
text : string, optiona
Additional text to add to the upper-left corner of the plot.
step : float, optional
Length of each time step. [hr]
lstep : float, optional
Length of time steps between labels. [hr]
number : int, optional
Number of steps.
lformat : string, optional
Label format, using strftime format codes.
alpha : float, optional
Transparency for figure annotations. 0 to 1 for transparent
to solid.
lalpha : float, optional
Transparency for labels.
**kwargs
Additional keyword arguments are passed to
`astroquery.mpc.MPC.get_ephemeris`.
"""
import os
import matplotlib.pyplot as plt
from astropy.io import fits
from astropy.wcs import WCS
from astropy.wcs.utils import skycoord_to_pixel
from astropy.time import Time
import astropy.units as u
import astropy.coordinates as coords
from astropy.table import vstack
from astroquery.skyview import SkyView
from astroquery.mpc import MPC
import aplpy
from .. import util
# nominal tick marks
t0 = Time(start)
current = 0
tab = None
while True:
t1 = t0 + current * u.hr
n = min(number - current, 1440)
if n <= 0:
break
e = MPC.get_ephemeris(target, location=observer, start=t1,
step=step * u.hr, number=n, **kwargs)
if tab is None:
tab = e
else:
tab = vstack((tab, e))
current += n
dates = tab['Date']
eph = coords.SkyCoord(u.Quantity(tab['RA']), u.Quantity(tab['Dec']))
# label tick marks
current = 0
tab = None
number_lsteps = int(number * step / lstep)
while True:
t1 = t0 + current * u.hr
n = min(number_lsteps - current, 1440)
if n <= 0:
break
e = MPC.get_ephemeris(target, location=observer, start=t1,
step=lstep * u.hr, number=n, **kwargs)
if tab is None:
tab = e
else:
tab = vstack((tab, e))
current += n
dates_labels = tab['Date']
labels = coords.SkyCoord(u.Quantity(tab['RA']), u.Quantity(tab['Dec']))
step = 0
while step < len(eph):
print('This step: ', dates[step],
eph[step].to_string('hmsdms', sep=':', precision=0))
fn = '{}'.format(
eph[step].to_string('hmsdms', sep='', precision=0).replace(' ', ''))
if os.path.exists('sky-{}.fits.gz'.format(fn)):
print('reading from file')
im = fits.open('sky-{}.fits.gz'.format(fn))
else:
print('reading from URL')
# note, radius seems to be size of image
position = eph[step].to_string('decimal', precision=6)
opts = dict(position=position, radius=size * u.arcmin,
pixels=int(900 / 15 * size))
im = None
for survey in surveys:
print(survey)
try:
im = SkyView.get_images(survey=survey, **opts)[0]
except:
continue
break
if im is None:
raise ValueError("Cannot download sky image.")
im.writeto('sky-{}.fits.gz'.format(fn))
wcs = WCS(im[0].header)
c = skycoord_to_pixel(eph, wcs, 0)
i = (c[0] > 0) * (c[0] < 900) * (c[1] > 0) * (c[1] < 900)
c = skycoord_to_pixel(labels, wcs, 0)
j = (c[0] > 0) * (c[0] < 900) * (c[1] > 0) * (c[1] < 900)
fig = aplpy.FITSFigure(im)
fig.set_title(target)
vmin = np.min(im[0].data)
if vmin < 0:
vmid = vmin * 1.5
else:
vmid = vmin / 2
fig.show_colorscale(cmap='viridis', stretch='log', vmid=vmid)
fig.show_lines([np.vstack((eph[i].ra.degree, eph[i].dec.degree))],
color='w', alpha=alpha)
fig.show_markers(eph[i].ra.degree, eph[i].dec.degree, c='w',
marker='x', alpha=alpha)
for k in np.flatnonzero(j):
d = dates_labels[k]
fig.add_label(labels.ra[k].degree, labels.dec[k].degree,
d.datetime.strftime(lformat), color='w',
alpha=lalpha, size='small')
fig.show_rectangles(eph[step].ra.degree, eph[step].dec.degree,
1 / 60, 1 / 60, edgecolors='w', alpha=alpha)
if text is not None:
ax = plt.gca()
ax.text(0.03, 0.98, text, va='top', transform=ax.transAxes,
size=16, color='w')
t = target.replace(' ', '').replace('/', '').replace("'", '').lower()
d = dates[step]
d = d.isot[:16].replace('-', '').replace(':', '').replace('T', '_')
fig.save('{}-{}-{}.png'.format(t, d, fn),
dpi=300)
step = np.flatnonzero(i)[-1] + 1
def plot_finder_image(target,
survey='DSS',
fov_radius=10 * u.arcmin,
log=False,
ax=None,
grid=False,
reticle=False,
style_kwargs=None,
reticle_style_kwargs=None):
"""
Plot survey image centered on ``target``.
Survey images are retrieved from NASA Goddard's SkyView service via
``astroquery.skyview.SkyView``.
If a `~matplotlib.axes.Axes` object already exists, plots the finder image
on top. Otherwise, creates a new `~matplotlib.axes.Axes`
object with the finder image.
Parameters
----------
target : `~astroplan.FixedTarget`, `~astropy.coordinates.SkyCoord`
Coordinates of celestial object
survey : string
Name of survey to retrieve image from. For dictionary of
available surveys, use
``from astroquery.skyview import SkyView; SkyView.list_surveys()``.
Defaults to ``'DSS'``, the Digital Sky Survey.
fov_radius : `~astropy.units.Quantity`
Radius of field of view of retrieved image. Defaults to 10 arcmin.
log : bool, optional
Take the natural logarithm of the FITS image if `True`.
False by default.
ax : `~matplotlib.axes.Axes` or None, optional.
The `~matplotlib.axes.Axes` object to be drawn on.
If None, uses the current `~matplotlib.axes.Axes`.
grid : bool, optional.
Grid is drawn if `True`. `False` by default.
reticle : bool, optional
Draw reticle on the center of the FOV if `True`. Default is `False`.
style_kwargs : dict or `None`, optional.
A dictionary of keywords passed into `~matplotlib.pyplot.imshow`
to set plotting styles.
reticle_style_kwargs : dict or `None`, optional
A dictionary of keywords passed into `~matplotlib.pyplot.axvline` and
`~matplotlib.pyplot.axhline` to set reticle style.
Returns
-------
ax : `~matplotlib.axes.Axes`
Matplotlib axes with survey image centered on ``target``
hdu : `~astropy.io.fits.PrimaryHDU`
FITS HDU of the retrieved image
Notes
-----
Dependencies:
In addition to Matplotlib, this function makes use of astroquery.
"""
import matplotlib.pyplot as plt
from astroquery.skyview import SkyView
coord = target if not hasattr(target, 'coord') else target.coord
position = coord.icrs
coordinates = 'icrs'
target_name = None if isinstance(target, SkyCoord) else target.name
hdu = SkyView.get_images(position=position,
coordinates=coordinates,
survey=survey,
radius=fov_radius,
grid=grid)[0][0]
wcs = WCS(hdu.header)
# Set up axes & plot styles if needed.
if ax is None:
ax = plt.gca(projection=wcs)
if style_kwargs is None:
style_kwargs = {}
style_kwargs = dict(style_kwargs)
style_kwargs.setdefault('cmap', 'Greys')
style_kwargs.setdefault('origin', 'lower')
if log:
image_data = np.log(hdu.data)
else:
image_data = hdu.data
ax.imshow(image_data, **style_kwargs)
# Draw reticle
if reticle:
pixel_width = image_data.shape[0]
inner, outer = 0.03, 0.08
if reticle_style_kwargs is None:
reticle_style_kwargs = {}
reticle_style_kwargs.setdefault('linewidth', 2)
reticle_style_kwargs.setdefault('color', 'm')
ax.axvline(x=0.5 * pixel_width,
ymin=0.5 + inner,
ymax=0.5 + outer,
**reticle_style_kwargs)
ax.axvline(x=0.5 * pixel_width,
ymin=0.5 - inner,
ymax=0.5 - outer,
**reticle_style_kwargs)
ax.axhline(y=0.5 * pixel_width,
xmin=0.5 + inner,
xmax=0.5 + outer,
**reticle_style_kwargs)
ax.axhline(y=0.5 * pixel_width,
xmin=0.5 - inner,
xmax=0.5 - outer,
**reticle_style_kwargs)
# Labels, title, grid
ax.set(xlabel='RA', ylabel='DEC')
if target_name is not None:
ax.set_title(target_name)
ax.grid(grid)
# Redraw the figure for interactive sessions.
ax.figure.canvas.draw()
return ax, hdu
def finding_chart(npointing,delta_image = .25,offset_ra=0.,offset_dec=0.,plotsingle=True,ING=False,MLO=False,KPNO=False):
galsize=0.033
i = npointing-1
center_ra = pointing_ra[i]+offset_ra
center_dec = pointing_dec[i] + offset_dec
print('center ra, dec = ',center_ra,center_dec)
if plotsingle:
if delta_image > .3:
plt.subplots_adjust(right=.9,top=.9,bottom=.1,left=.1)
plt.figure(figsize=(10,9))
else:
plt.figure(figsize=(6,6))
ax=plt.gca()
pos = coords.SkyCoord(center_ra,center_dec,frame='icrs',unit='degree')
delta_imagex=2.*delta_image
delta_imagey=2.*delta_image
if ING:
delta_imagex=.8 #image width in deg
delta_imagey=.8 # image width in deg
xout = SkyView.get_images(pos,survey=['DSS'],height=delta_imagex*u.degree,width=delta_imagey*u.degree)
elif MLO:
delta_imagex = 13./60. # image width in deg
delta_imagey = 13./60 # image width in deg
xout = SkyView.get_images(pos,survey=['DSS'],height=2*delta_image*u.degree,width=2.*delta_image*u.degree)
b=xout[0][0]
ax.imshow(xout[0][0].data,interpolation='none',aspect='equal',cmap='gray_r',extent=[b.header['CRVAL1']-(b.header['NAXIS1']-b.header['CRPIX1'])*b.header['CDELT1'],
b.header['CRVAL1']+(b.header['NAXIS1']-b.header['CRPIX1'])*b.header['CDELT1'],
b.header['CRVAL2']+(b.header['NAXIS2']-b.header['CRPIX2'])*b.header['CDELT2'],
b.header['CRVAL2']-(b.header['NAXIS2']-b.header['CRPIX2'])*b.header['CDELT2']])
if ING:
# add footprint of WFC chips
plot_INT_footprint(center_ra,center_dec)
elif MLO:
delta_arcmin = 13.
rect= plt.Rectangle((center_ra-0.5*delta_imagex,center_dec-0.5*delta_imagey), delta_arcmin/60., delta_arcmin/60.,fill=False, color='k')
plt.gca().add_artist(rect)
elif KPNO:
rect= plt.Rectangle((center_ra-delta_image,center_dec-delta_image), 0.5, 0.5,fill=False, color='k')
plt.gca().add_artist(rect)
#add_cameras()
# find galaxies on FOV
#for MLO plot galaxies outside the field of view to help with tweaking the pointing
if MLO:
source_pad = 8./60.
gals = (nsa.RA > (pos.ra.value-(delta_imagex/2.+source_pad))) & (nsa.RA < (pos.ra.value+delta_imagex/2 + source_pad)) & (nsa.DEC > (pos.dec.value-(delta_imagey/2. + source_pad))) & (nsa.DEC < (pos.dec.value+delta_imagey/2. + source_pad))
else:
gals = (nsa.RA > (pos.ra.value-delta_imagex/2.)) & (nsa.RA < (pos.ra.value+delta_imagex/2)) & (nsa.DEC > (pos.dec.value-delta_imagey/2.)) & (nsa.DEC < (pos.dec.value+delta_imagey/2.))
print('pointing ',i+1,' ngal = ',np.sum(gals))
gindex=np.arange(len(nsa.RA))[gals]
print('Pointing %02d Galaxies'%(npointing),': ',nsa.NSAID[gals])
print('Pointing %02d Galaxies'%(npointing),': ',nsa.Z[gals]*3.e5)
for j in gindex:
ran,decn=fix_project(nsa.RA[j],nsa.DEC[j],b)
rect= plt.Rectangle((ran-galsize/2.,decn-galsize/2.), galsize, galsize,fill=False, color='c')
plt.gca().add_artist(rect)
s='%i\n vr=%i'%(nsa.NSAID[j],nsa.Z[j]*3.e5)
plt.text(ran,decn+galsize/2.,s,fontsize=10,clip_on=True,horizontalalignment='center',verticalalignment='bottom')
plt.text(ran,decn-galsize/2.,co.NEDname[j].decode("utf-8"),fontsize=10,clip_on=True,horizontalalignment='center',verticalalignment='top')
if COflag[j]:
size=galsize-.005
rect= plt.Rectangle((ran-size/2.,decn-size/2.), size, size,fill=False, color='g')
plt.gca().add_artist(rect)
if HIflag[j]:
size=galsize+.005
rect= plt.Rectangle((ran-size/2.,decn-size/2.), size, size,fill=False, color='b')
plt.gca().add_artist(rect)
if ha_obs[j]:
size=galsize+.005
rect= plt.Rectangle((ran-size/2.,decn-size/2.), size, size,fill=False, color='r')
plt.gca().add_artist(rect)
#plt.legend(['filament','CO','Halpha'])
if moretargets:
plt.title('LM-Pointing %02d: %s'%((i+1),pos.to_string('hmsdms')))
else:
plt.title('Pointing %02d: %s'%((i+1),pos.to_string('hmsdms')))
plt.xlabel('RA (deg)')
plt.ylabel('DEC (deg)')
plt.gca().invert_yaxis()
if plotsingle:
plt.savefig(outfile_prefix+'Pointing%02d.png'%(i+1))
def mkpy3_finder_chart_survey_fits_image_get_v1(\
ra_deg=None,
dec_deg=None,
radius_arcmin=None,
survey=None,
cframe=None,
verbose=None
):
"""
Function: mkpy3_finder_chart_survey_fits_image_get_v1()
Purpose:
Gets sky survey image data around a position on the sky.
Parameters
----------
ra_deg : float (optional)
right ascencsion [deg]
dec_deg : float (optional)
declination [deg]
radius_arcmin : float (optional)
radius (halfwidth and halfheight of image) [arcmin]
survey : string (optional) [e.g., '2MASS-J', 'DSS2 Red', etc.]
survey string name
cframe : str (optional)
coordinate frame name [e.g., 'fk5', 'icrs', etc.]
verbose : bool (optional)
if True, print extra information
Returns
-------
hdu :
Header/Data Unit (HDU) of the survey FITS file
hdr :
header associated with hdu
data :
data associated with hdu
wcs :
World Coordinate System from hdu
cframe :
coordinate frame of the survey data
# Kenneth John Mighell
# Kepler/K2 Support Scientist
# Kepler/K2 Science Office
# NASA Ames Research Center / SETI Institute
"""
import astropy.units as u
from astropy.coordinates import SkyCoord
from astroquery.skyview import SkyView
from astropy.wcs import WCS
#
if (ra_deg is None): ra_deg = 291.41829 # Kepler-93b
if (dec_deg is None): dec_deg = 38.67236 # Kepler-93b
if (radius_arcmin is None): radius_arcmin = 1.99
if (survey is None): survey = '2MASS-J' # alternate: 'DSS2 Red'
# ^--- to see all surveys: astroquery.skyview.SkyView.list_surveys()
if (cframe is None): cframe = 'fk5' # N.B.: '2MASS-J' uses 'fk5'
if (verbose is None): verbose = False
#
if (verbose):
print(ra_deg, '=ra_deg')
print(dec_deg, '=dec_deg')
print(radius_arcmin, '=radius_arcmin')
print("'%s' =survey" % (survey))
print("'%s' =cframe" % (cframe))
print(verbose, '=verbose')
print()
pass #if
#
# sc <--- astropy sky coordinates
sc = SkyCoord(ra=ra_deg * u.degree, dec=dec_deg * u.degree, frame=cframe)
# image list # assume that the list contains a single image
imgl = SkyView.get_images(position=sc,
survey=survey,
radius=radius_arcmin * u.arcmin)
#
# outputs:
hdu = imgl[0] # Header/Data Unit of the FITS image
hdr = hdu[0].header # header associated with the HDU
data = hdu[0].data # data associated with the HDU
wcs = WCS(
hdr
) # World Coordinate System from the FITS header of the survey image
#
return hdu, hdr, data, wcs, cframe
def finding_chart(npointing,delta_image = .25,offset_ra=0.,offset_dec=0.,plotsingle=True,ING_flag=False):
i = npointing-1
galsize=0.033
center_ra = pointing_ra[i]+offset_ra
center_dec = pointing_dec[i] + offset_dec
print('center ra, dec = ',center_ra,center_dec)
if plotsingle:
if delta_image > .3:
plt.subplots_adjust(right=.9,top=.9,bottom=.1,left=.1)
plt.figure(figsize=(10,9))
else:
plt.figure(figsize=(6,6))
ax=plt.gca()
pos = coords.SkyCoord(center_ra,center_dec,frame='icrs',unit='degree')
if ING_flag:
xout = SkyView.get_images(pos,survey=['DSS'],height=.7*u.degree,width=.6*u.degree)
else:
xout = SkyView.get_images(pos,survey=['DSS'],height=2*delta_image*u.degree,width=2.*delta_image*u.degree)
b=xout[0][0]
ax.imshow(xout[0][0].data,interpolation='none',aspect='equal',cmap='gray_r',extent=[b.header['CRVAL1']-(b.header['NAXIS1']-b.header['CRPIX1'])*b.header['CDELT1'],
b.header['CRVAL1']+(b.header['NAXIS1']-b.header['CRPIX1'])*b.header['CDELT1'],
b.header['CRVAL2']+(b.header['NAXIS2']-b.header['CRPIX2'])*b.header['CDELT2'],
b.header['CRVAL2']-(b.header['NAXIS2']-b.header['CRPIX2'])*b.header['CDELT2']])
if ING_flag:
# add footprint of WFC chips
plot_INT_footprint(center_ra,center_dec)
else:
rect= plt.Rectangle((center_ra-delta_image,center_dec-delta_image), 0.5, 0.5,fill=False, color='k')
plt.gca().add_artist(rect)
#add_cameras()
# find galaxies on FOV
gals = (nsa.RA > (center_ra-delta_image)) & (nsa.RA < (center_ra+delta_image)) & (nsa.DEC > (center_dec-delta_image)) & (nsa.DEC < (center_dec+delta_image))
print('pointing ',i+1,' ngal = ',np.sum(gals))
gindex=np.arange(len(nsa.RA))[gals]
print('Pointing %02d Galaxies'%(npointing),': ',nsa.NSAID[gals])
for j in gindex:
ran,decn=fix_project(nsa.RA[j],nsa.DEC[j],b)
rect= plt.Rectangle((ran-galsize/2.,decn-galsize/2.), galsize, galsize,fill=False, color='c')
plt.gca().add_artist(rect)
s='%i, vr=%i'%(nsa.NSAID[j],nsa.ZDIST[j]*3.e5)
plt.text(ran,decn+galsize/2.,s,fontsize=10,clip_on=True,horizontalalignment='center')
plt.text(ran,decn-galsize/2.,co.NEDname[j],fontsize=10,clip_on=True,horizontalalignment='center',verticalalignment='top')
if COflag[j]:
size=galsize-.005
rect= plt.Rectangle((ran-size/2.,decn-size/2.), size, size,fill=False, color='g')
plt.gca().add_artist(rect)
if HIflag[j]:
size=galsize+.005
rect= plt.Rectangle((ran-size/2.,decn-size/2.), size, size,fill=False, color='b')
plt.gca().add_artist(rect)
if ha_obs[j]:
size=galsize+.005
rect= plt.Rectangle((ran-size/2.,decn-size/2.), size, size,fill=False, color='r')
plt.gca().add_artist(rect)
#plt.legend(['filament','CO','Halpha'])
plt.title('Pointing %02d: %s'%((i+1),pos.to_string('hmsdms')))
plt.xlabel('RA (deg)')
plt.ylabel('DEC (deg)')
plt.gca().invert_yaxis()
if plotsingle:
plt.savefig(outfile_prefix+'Pointing%02d.png'%(i+1))