def get_fluxes(match):
"""Return (flux, ref_flux) or None if either is invalid."""
# NOTE: Protect against negative fluxes: ignore this match if we find one.
flux = match[1]['slot_CalibFlux_flux']
if flux < 0:
return None
else:
# convert to magnitudes and then Janskys, for a useable flux.
flux = fluxFromABMag(calib.getMagnitude(flux))
# NOTE: Have to protect against negative reference fluxes too.
if 'slot' in ref_flux_key:
ref_flux = match[0][ref_flux_key]
if ref_flux < 0:
return None
else:
ref_flux = fluxFromABMag(refcalib.getMagnitude(ref_flux))
else:
# a.net fluxes are already in Janskys.
ref_flux = match[0][ref_flux_key.format(filt)]
if ref_flux < 0:
return None
Flux = collections.namedtuple('Flux', ('flux', 'ref_flux'))
return Flux(flux, ref_flux)
def make_source_catalog_from_astropy_table(out_table, debug=False):
"""Return an AFW SourceCatalog from an Astropy Table
Written with extensive reference to
https://github.com/lsst/meas_astrom/blob/master/convertToFitsTable.py
"""
filters = ('J', 'H', 'K')
schema = makeMinimalSchema(filters=filters, debug=debug)
out_cat = afwTable.SourceCatalog(schema)
for row in out_table:
record = out_cat.addNew()
record.setId(twomass_int_id(row['2MASSID']))
record.setRa(float(row['coord_ra']) * lsst.afw.geom.degrees)
record.setDec(float(row['coord_dec']) * lsst.afw.geom.degrees)
for filt in filters:
filtMag = '%s_mag' % filt
filtMagSigma = '%s_mag_sigma' % filt
filtFlux = '%s_flux' % filt
filtFluxSigma = '%s_fluxSigma' % filt
abMag = vegaToABMag(row[filtMag], filt) # error remains unchanged
record.set(filtFlux, fluxFromABMag(abMag))
record.set(filtFluxSigma, fluxErrFromABMagErr(row[filtMagSigma], abMag))
return out_cat
def plot_point_mags(output_data, visits, outfile, dataId):
# get a butler
butler = dp.Butler(output_data)
# The following value for refcatId is "mandatory, but meaningless",
# so we won't try to generalize it.
refcatId = {'tract':0, 'patch':'0,0'}
ref = butler.get('deepCoadd_ref', dataId=refcatId)
# visits to use for lightcurves
visit_list = [int(x) for x in visits.split('^')]
# get the sources and calib objects for each single epoch visit
forced_srcs = {}
calibs = {}
for visit in visit_list:
dataId['visit'] = visit
forced_srcs[visit] = butler.get('forced_src', dataId=dataId)
calexp = butler.get('calexp', dataId=dataId)
calibs[visit] = calexp.getCalib()
del calexp
# initialize dictionaries to hold lightcurve arrays. Get
# extendedness from the coadd catalog.
lightcurve_fluxes = {}
extendedness = {}
for idx, ext in zip(ref.get('id'),
ref.get('base_ClassificationExtendedness_value')):
lightcurve_fluxes[idx] = []
extendedness[idx] = ext
# pivot the source tables to assemble lightcurves
for visit, forced_src in forced_srcs.iteritems():
calib = calibs[visit]
for idx, flux in zip(forced_src.get('objectId'),
forced_src.get('base_PsfFlux_flux')):
if extendedness[idx] > 0.5:
continue
if flux <= 0.:
continue
lightcurve_fluxes[idx].append(afw_image.fluxFromABMag(calib.getMagnitude(flux)))
# compute aggregate quantities for each object and plot
for lightcurve in lightcurve_fluxes.values():
if len(lightcurve) == len(visit_list):
plt.scatter(afw_image.abMagFromFlux(numpy.median(lightcurve)),
numpy.std(lightcurve)/numpy.median(lightcurve),
alpha=0.5)
mags, invsnrs = make_invsnr_arr()
plt.plot(mags, invsnrs, color='red', linewidth=2, alpha=0.75)
plt.xlabel("Calibrated magnitude of median flux")
plt.ylabel("stdev(flux)/median(flux)")
plt.xlim(15.5, 25)
plt.ylim(0., 0.5)
plt.savefig(outfile)
def _set_mags(self, record, row, key_map):
"""!Set the flux records from the input magnitudes
@param[in,out] record SourceCatalog record to modify
@param[in] row dict like object containing magnitude values
@param[in] key_map Map of catalog keys to use in filling the record
"""
for item in self.config.mag_column_list:
record.set(key_map[item + "_flux"], fluxFromABMag(row[item]))
if len(self.config.mag_err_column_map) > 0:
for err_key in self.config.mag_err_column_map.keys():
error_col_name = self.config.mag_err_column_map[err_key]
record.set(key_map[err_key + "_fluxSigma"], fluxErrFromABMagErr(row[error_col_name], row[err_key]))
def testBasics(self):
for flux in (1, 210, 3210, 43210, 543210):
abMag = afwImage.abMagFromFlux(flux)
self.assertAlmostEqual(abMag, refABMagFromFlux(flux))
fluxRoundTrip = afwImage.fluxFromABMag(abMag)
self.assertAlmostEqual(flux, fluxRoundTrip)
for fluxErrFrac in (0.001, 0.01, 0.1):
fluxErr = flux * fluxErrFrac
abMagErr = afwImage.abMagErrFromFluxErr(fluxErr, flux)
self.assertAlmostEqual(abMagErr, refABMagErrFromFluxErr(fluxErr, flux))
fluxErrRoundTrip = afwImage.fluxErrFromABMagErr(abMagErr, abMag)
self.assertAlmostEqual(fluxErr, fluxErrRoundTrip)
def _set_mags(self, record, row, key_map):
"""!Set the flux records from the input magnitudes
@param[in,out] record SourceCatalog record to modify
@param[in] row dict like object containing magnitude values
@param[in] key_map Map of catalog keys to use in filling the record
"""
for item in self.config.mag_column_list:
record.set(key_map[item + '_flux'], fluxFromABMag(row[item]))
if len(self.config.mag_err_column_map) > 0:
for err_key in self.config.mag_err_column_map.keys():
error_col_name = self.config.mag_err_column_map[err_key]
record.set(
key_map[err_key + '_fluxSigma'],
fluxErrFromABMagErr(row[error_col_name], row[err_key]))
def testVector(self):
flux = np.array([1.0, 210.0, 3210.0, 43210.0, 543210.0])
flux.flags.writeable = False # Put the 'const' into ndarray::Array<double const, 1, 0>
abMag = afwImage.abMagFromFlux(flux)
self.assertFloatsAlmostEqual(abMag, refABMagFromFlux(flux))
fluxRoundTrip = afwImage.fluxFromABMag(abMag)
self.assertFloatsAlmostEqual(flux, fluxRoundTrip, rtol=1.0e-15)
for fluxErrFrac in (0.001, 0.01, 0.1):
fluxErr = flux * fluxErrFrac
abMagErr = afwImage.abMagErrFromFluxErr(fluxErr, flux)
self.assertFloatsAlmostEqual(abMagErr, refABMagErrFromFluxErr(fluxErr, flux))
fluxErrRoundTrip = afwImage.fluxErrFromABMagErr(abMagErr, abMag)
self.assertFloatsAlmostEqual(fluxErr, fluxErrRoundTrip, rtol=1.0e-15)
def testVector(self):
flux = np.array([1.0, 210.0, 3210.0, 43210.0, 543210.0])
flux.flags.writeable = False # Put the 'const' into ndarray::Array<double const, 1, 0>
abMag = afwImage.abMagFromFlux(flux)
self.assertFloatsAlmostEqual(abMag, refABMagFromFlux(flux))
fluxRoundTrip = afwImage.fluxFromABMag(abMag)
self.assertFloatsAlmostEqual(flux, fluxRoundTrip, rtol=1.0e-15)
for fluxErrFrac in (0.001, 0.01, 0.1):
fluxErr = flux * fluxErrFrac
abMagErr = afwImage.abMagErrFromFluxErr(fluxErr, flux)
self.assertFloatsAlmostEqual(abMagErr,
refABMagErrFromFluxErr(fluxErr, flux))
fluxErrRoundTrip = afwImage.fluxErrFromABMagErr(abMagErr, abMag)
self.assertFloatsAlmostEqual(fluxErr,
fluxErrRoundTrip,
rtol=1.0e-15)
def _formatCatalog(self, fgcmStarCat, offsets):
"""
Turn an FGCM-formatted star catalog, applying zeropoint offsets.
Parameters
----------
fgcmStarCat: `afwTable.SimpleCatalog`
SimpleCatalog as output by fgcmcal
offsets: `list` with len(self.bands) entries
Zeropoint offsets to apply
Returns
-------
formattedCat: `afwTable.SimpleCatalog`
SimpleCatalog suitable for using as a reference catalog
"""
sourceMapper = afwTable.SchemaMapper(fgcmStarCat.schema)
minSchema = LoadIndexedReferenceObjectsTask.makeMinimalSchema(
self.bands, addCentroid=False, addIsResolved=True, coordErrDim=0)
sourceMapper.addMinimalSchema(minSchema)
for band in self.bands:
sourceMapper.editOutputSchema().addField('%s_nGood' % (band),
type=np.int32)
formattedCat = afwTable.SimpleCatalog(sourceMapper.getOutputSchema())
formattedCat.reserve(len(fgcmStarCat))
formattedCat.extend(fgcmStarCat, mapper=sourceMapper)
# Note that we don't have to set `resolved` because the default is False
for b, band in enumerate(self.bands):
mag = fgcmStarCat['mag_std_noabs'][:, b] + offsets[b]
# We want fluxes in Jy from calibrated AB magnitudes
# (after applying offset)
# TODO: Full implementation of RFC-549 will have all reference
# catalogs in nJy instead of Jy.
flux = afwImage.fluxFromABMag(mag)
fluxErr = afwImage.fluxErrFromABMagErr(
fgcmStarCat['magErr_std'][:, b], mag)
formattedCat['%s_flux' % (band)][:] = flux
formattedCat['%s_fluxErr' % (band)][:] = fluxErr
formattedCat['%s_nGood' % (band)][:] = fgcmStarCat['ngood'][:, b]
return formattedCat
def _setFlux(self, record, row, key_map):
"""Set flux fields in a record of an indexed catalog.
Parameters
----------
record : `lsst.afw.table.SimpleRecord`
Row from indexed catalog to modify.
row : structured `numpy.array`
Row from catalog being ingested.
key_map : `dict` mapping `str` to `lsst.afw.table.Key`
Map of catalog keys.
"""
for item in self.config.mag_column_list:
record.set(key_map[item + '_flux'], fluxFromABMag(row[item]))
if len(self.config.mag_err_column_map) > 0:
for err_key in self.config.mag_err_column_map.keys():
error_col_name = self.config.mag_err_column_map[err_key]
record.set(
key_map[err_key + '_fluxErr'],
fluxErrFromABMagErr(row[error_col_name], row[err_key]))
def _formatCatalog(self, fgcmStarCat, offsets):
"""
Turn an FGCM-formatted star catalog, applying zp offsets.
parameters
----------
fgcmStarCat: SimpleCatalog
SimpleCatalog as output by fgcmcal
offsets: list with len(self.bands) entries
Zeropoint offsets to apply
returns
-------
formattedCat: SimpleCatalog
SimpleCatalog suitable for ref_cat
"""
sourceMapper = afwTable.SchemaMapper(fgcmStarCat.schema)
sourceMapper.addMinimalSchema(afwTable.SimpleTable.makeMinimalSchema())
for band in self.bands:
sourceMapper.editOutputSchema().addField('%s_flux' % (band),
type=np.float64)
sourceMapper.editOutputSchema().addField('%s_fluxErr' % (band),
type=np.float64)
sourceMapper.editOutputSchema().addField('%s_nGood' % (band),
type=np.float64)
formattedCat = afwTable.SimpleCatalog(sourceMapper.getOutputSchema())
formattedCat.reserve(len(fgcmStarCat))
formattedCat.extend(fgcmStarCat, mapper=sourceMapper)
for b, band in enumerate(self.bands):
mag = fgcmStarCat['mag_std_noabs'][:, b] + offsets[b]
flux = afwImage.fluxFromABMag(mag)
fluxErr = afwImage.fluxErrFromABMagErr(
fgcmStarCat['magerr_std'][:, b], mag)
formattedCat['%s_flux' % (band)][:] = flux
formattedCat['%s_fluxErr' % (band)][:] = fluxErr
formattedCat['%s_nGood' % (band)][:] = fgcmStarCat['ngood'][:, b]
return formattedCat
def plot_point_mags(output_data,
visit_list,
dataId,
minMag=17,
mid_cut=20,
maxMag=26,
fit_curves=True):
# get a butler
butler = dp.Butler(output_data)
# The following value for refcatId is "mandatory, but meaningless",
# so we won't try to generalize it.
refcatId = {'tract': 0, 'patch': '0,0'}
ref = butler.get('deepCoadd_ref', dataId=refcatId)
# get the sources and calib objects for each single epoch visit
forced_srcs = {}
calibs = {}
for visit in visit_list:
dataId['visit'] = visit
try:
my_forced_srcs = butler.get('forced_src', dataId=dataId)
calexp = butler.get('calexp', dataId=dataId)
my_calibs = calexp.getCalib()
del calexp
forced_srcs[visit] = my_forced_srcs
calibs[visit] = my_calibs
except FitsError as eobj:
print(eobj)
# initialize dictionaries to hold lightcurve arrays. Get
# extendedness from the coadd catalog.
lightcurve_fluxes = {}
extendedness = {}
for idx, ext in zip(ref.get('id'),
ref.get('base_ClassificationExtendedness_value')):
lightcurve_fluxes[idx] = []
extendedness[idx] = ext
# pivot the source tables to assemble lightcurves
for visit, forced_src in forced_srcs.items():
calib = calibs[visit]
for idx, flux in zip(forced_src.get('objectId'),
forced_src.get('base_PsfFlux_flux')):
if extendedness[idx] > 0.5:
continue
if flux <= 0.:
continue
lightcurve_fluxes[idx].append(
afw_image.fluxFromABMag(calib.getMagnitude(flux)))
# compute aggregate quantities for each object and plot
band = dataId['filter']
med_mags = []
med_err = []
for lightcurve in lightcurve_fluxes.values():
if len(lightcurve) == len(visit_list):
median_flux = np.median(lightcurve)
med_mags.append(afw_image.abMagFromFlux(median_flux))
med_err.append(np.std(lightcurve) / median_flux)
print("number of objects: ", len(med_mags))
mag_stats = MagStats(band, med_mags, med_err, fit_curves=fit_curves)
if mag_stats.pcov is not None:
label ='filter=%s, Floor=%.1f%%, m_5=%0.2f' \
% (band, mag_stats.sys_floor*100, mag_stats.popt[1])
else:
label ='filter=%s, Floor=%.1f%%' \
% (band, mag_stats.sys_floor*100)
scatter = plt.scatter(med_mags,
med_err,
alpha=0.3,
color=_filter_color[band],
marker=_filter_symbol[band],
label=label)
plt.xlabel("Calibrated magnitude of median flux")
plt.ylabel("stdev(flux)/median(flux)")
plt.xlim(15.5, 25)
plt.ylim(0., 0.5)
return scatter, mag_stats
def _computeReferenceOffsets(self, butler):
"""
Compute offsets relative to a reference catalog.
Parameters
----------
butler: lsst.daf.persistence.Butler
Returns
-------
offsets: np.array of floats
Per band zeropoint offsets
"""
# Load the stars
stars = butler.get('fgcmStandardStars', fgcmcycle=self.useCycle)
# Only use stars that are observed in all the bands
minObs = stars['ngood'].min(axis=1)
# Depending on how things work, this might need to be configurable
# However, I think that best results will occur when we use the same
# pixels to do the calibration for all the bands, so I think this
# is the right choice.
goodStars = (minObs >= 1)
stars = stars[goodStars]
self.log.info(
"Found %d stars with at least 1 good observation in each band" %
(len(stars)))
# We have to make a table for each pixel with flux/fluxErr
sourceMapper = afwTable.SchemaMapper(stars.schema)
sourceMapper.addMinimalSchema(afwTable.SimpleTable.makeMinimalSchema())
sourceMapper.editOutputSchema().addField('flux',
type=np.float64,
doc="flux")
sourceMapper.editOutputSchema().addField('fluxErr',
type=np.float64,
doc="flux error")
badStarKey = sourceMapper.editOutputSchema().addField('flag_badStar',
type='Flag',
doc="bad flag")
# The exposure is used to record the filter name
exposure = afwImage.ExposureF()
# Split up the stars (units are radians)
theta = np.pi / 2. - stars['coord_dec']
phi = stars['coord_ra']
ipring = hp.ang2pix(self.config.referencePixelizationNside, theta, phi)
h, rev = esutil.stat.histogram(ipring, rev=True)
gdpix, = np.where(h >= self.config.referencePixelizationMinStars)
self.log.info(
"Found %d pixels (nside=%d) with at least %d good stars" %
(gdpix.size, self.config.referencePixelizationNside,
self.config.referencePixelizationMinStars))
if gdpix.size < self.config.referencePixelizationNPixels:
self.log.warn(
"Found fewer good pixels (%d) than preferred in configuration (%d)"
% (gdpix.size, self.config.referencePixelizationNPixels))
else:
# Sample out the pixels we want to use
gdpix = np.random.choice(
gdpix,
size=self.config.referencePixelizationNPixels,
replace=False)
results = np.zeros(gdpix.size,
dtype=[('hpix', 'i4'),
('nstar', 'i4', len(self.bands)),
('nmatch', 'i4', len(self.bands)),
('zp', 'f4', len(self.bands)),
('zpErr', 'f4', len(self.bands))])
results['hpix'] = ipring[rev[rev[gdpix]]]
# We need a boolean index to deal with catalogs...
selected = np.zeros(len(stars), dtype=np.bool)
refFluxFields = [None] * len(self.bands)
for p, pix in enumerate(gdpix):
i1a = rev[rev[pix]:rev[pix + 1]]
# Need to convert to a boolean array
selected[:] = False
selected[i1a] = True
for b, band in enumerate(self.bands):
sourceCat = afwTable.SimpleCatalog(
sourceMapper.getOutputSchema())
sourceCat.reserve(len(i1a))
sourceCat.extend(stars[selected], mapper=sourceMapper)
sourceCat['flux'] = afwImage.fluxFromABMag(
stars['mag_std_noabs'][selected, b])
sourceCat['fluxErr'] = afwImage.fluxErrFromABMagErr(
stars['magerr_std'][selected, b],
stars['mag_std_noabs'][selected, b])
# Make sure we only use stars that have valid measurements
# (This is perhaps redundant with requirements above that the
# stars be observed in all bands, but it can't hurt)
badStar = (stars['mag_std_noabs'][selected, b] > 90.0)
for rec in sourceCat[badStar]:
rec.set(badStarKey, True)
exposure.setFilter(afwImage.Filter(band))
if refFluxFields[b] is None:
# Need to find the flux field in the reference catalog
# to work around limitations of DirectMatch in PhotoCal
ctr = stars[0].getCoord()
rad = 0.05 * lsst.geom.degrees
refDataTest = self.refObjLoader.loadSkyCircle(
ctr, rad, band)
refFluxFields[b] = refDataTest.fluxField
# Make a copy of the config so that we can modify it
calConfig = copy.copy(self.config.photoCal.value)
calConfig.match.referenceSelection.signalToNoise.fluxField = refFluxFields[
b]
calConfig.match.referenceSelection.signalToNoise.errField = refFluxFields[
b] + 'Err'
calTask = self.config.photoCal.target(
refObjLoader=self.refObjLoader,
config=calConfig,
schema=sourceCat.getSchema())
struct = calTask.run(exposure, sourceCat)
results['nstar'][p, b] = len(i1a)
results['nmatch'][p, b] = len(struct.arrays.refMag)
results['zp'][p, b] = struct.zp
results['zpErr'][p, b] = struct.sigma
# And compute the summary statistics
offsets = np.zeros(len(self.bands))
for b, band in enumerate(self.bands):
# make configurable
ok, = np.where(
results['nmatch'][:, b] >= self.config.referenceMinMatch)
offsets[b] = np.median(results['zp'][ok, b])
madSigma = 1.4826 * np.median(
np.abs(results['zp'][ok, b] - offsets[b]))
self.log.info(
"Reference catalog offset for %s band: %.6f +/- %.6f" %
(band, offsets[b], madSigma))
return offsets
# initialize dictionaries to hold lightcurve arrays. Get extendedness from the coadd catalog.
lightcurve_fluxes = {}
extendedness = {}
for idx, ext in zip(ref.get('id'), ref.get('base_ClassificationExtendedness_value')):
lightcurve_fluxes[idx] = []
extendedness[idx] = ext
# pivot the source tables to assemble lightcurves
for visit, forced_src in forced_srcs.iteritems():
calib = calibs[visit]
for idx, flux in zip(forced_src.get('objectId'), forced_src.get('base_PsfFlux_flux')):
if extendedness[idx] > 0.5:
continue
if flux <= 0.:
continue
lightcurve_fluxes[idx].append(afw_image.fluxFromABMag(calib.getMagnitude(flux)))
# compute aggregate quantities for each object and plot
for lightcurve in lightcurve_fluxes.values():
if len(lightcurve) == 9:
plt.scatter(afw_image.abMagFromFlux(numpy.median(lightcurve)),
numpy.std(lightcurve)/numpy.median(lightcurve), alpha=0.5)
mags, invsnrs = make_invsnr_arr()
plt.plot(mags, invsnrs, color='red', linewidth=2, alpha=0.75)
plt.xlabel("Calibrated magnitude of median flux")
plt.ylabel("stdev(flux)/median(flux)")
plt.xlim(15.5, 25)
plt.ylim(0., 0.5)
plt.show()
def _runFgcmOutputProducts(self, visitDataRefName, ccdDataRefName,
filterMapping, zpOffsets, testVisit, testCcd,
testFilter, testBandIndex):
"""
"""
if self.logLevel is not None:
self.otherArgs.extend(['--loglevel', 'fgcmcal=%s' % self.logLevel])
args = [self.inputDir, '--output', self.testDir, '--doraise']
args.extend(self.otherArgs)
result = fgcmcal.FgcmOutputProductsTask.parseAndRun(
args=args, config=self.config, doReturnResults=True)
self._checkResult(result)
# Extract the offsets from the results
offsets = result.resultList[0].results.offsets
self.assertFloatsAlmostEqual(offsets[0], zpOffsets[0], rtol=1e-6)
self.assertFloatsAlmostEqual(offsets[1], zpOffsets[1], rtol=1e-6)
butler = dafPersistence.butler.Butler(self.testDir)
# Test the reference catalog stars
# Read in the raw stars...
rawStars = butler.get('fgcmStandardStars', fgcmcycle=0)
# Read in the new reference catalog...
config = LoadIndexedReferenceObjectsConfig()
config.ref_dataset_name = 'fgcm_stars'
task = LoadIndexedReferenceObjectsTask(butler, config=config)
# Read in a giant radius to get them all
refStruct = task.loadSkyCircle(rawStars[0].getCoord(),
5.0 * lsst.geom.degrees,
filterName='r')
# Make sure all the stars are there
self.assertEqual(len(rawStars), len(refStruct.refCat))
# And make sure the numbers are consistent
test, = np.where(rawStars['id'][0] == refStruct.refCat['id'])
mag = rawStars['mag_std_noabs'][0, 0] + offsets[0]
flux = afwImage.fluxFromABMag(mag)
fluxErr = afwImage.fluxErrFromABMagErr(rawStars['magerr_std'][0, 0],
mag)
self.assertFloatsAlmostEqual(flux,
refStruct.refCat['r_flux'][test[0]],
rtol=1e-6)
self.assertFloatsAlmostEqual(fluxErr,
refStruct.refCat['r_fluxErr'][test[0]],
rtol=1e-6)
# Test the joincal_photoCalib output
zptCat = butler.get('fgcmZeropoints', fgcmcycle=0)
selected = (zptCat['fgcmflag'] < 16)
# Read in all the calibrations, these should all be there
for rec in zptCat[selected]:
testCal = butler.get('jointcal_photoCalib',
dataId={
visitDataRefName: int(rec['visit']),
ccdDataRefName: int(rec['ccd']),
'filter':
filterMapping[rec['filtername']],
'tract': 0
})
# Our round-trip tests will be on this final one which is still loaded
testCal = butler.get('jointcal_photoCalib',
dataId={
visitDataRefName: int(testVisit),
ccdDataRefName: int(testCcd),
'filter': filterMapping[testFilter],
'tract': 0
})
src = butler.get('src',
dataId={
visitDataRefName: int(testVisit),
ccdDataRefName: int(testCcd)
})
# Only test sources with positive flux
gdSrc = (src['slot_CalibFlux_flux'] > 0.0)
# We need to apply the calibration offset to the fgcmzpt (which is internal
# and doesn't know about that yet)
testZpInd, = np.where((zptCat['visit'] == testVisit)
& (zptCat['ccd'] == testCcd))
fgcmZpt = zptCat['fgcmzpt'][testZpInd] + offsets[testBandIndex]
# This is the magnitude through the mean calibration
photoCalMeanCalMags = np.zeros(gdSrc.sum())
# This is the magnitude through the full focal-plane variable mags
photoCalMags = np.zeros_like(photoCalMeanCalMags)
# This is the magnitude with the FGCM (central-ccd) zeropoint
zptMeanCalMags = np.zeros_like(photoCalMeanCalMags)
for i, rec in enumerate(src[gdSrc]):
photoCalMeanCalMags[i] = testCal.instFluxToMagnitude(
rec['slot_CalibFlux_flux'])
photoCalMags[i] = testCal.instFluxToMagnitude(
rec['slot_CalibFlux_flux'], rec.getCentroid())
zptMeanCalMags[i] = fgcmZpt - 2.5 * np.log10(
rec['slot_CalibFlux_flux'])
# These should be very close but some tiny differences because the fgcm value
# is defined at the center of the bbox, and the photoCal is the mean over the box
self.assertFloatsAlmostEqual(photoCalMeanCalMags,
zptMeanCalMags,
rtol=1e-6)
# These should be roughly equal, but not precisely because of the focal-plane
# variation. However, this is a useful sanity check for something going totally
# wrong.
self.assertFloatsAlmostEqual(photoCalMeanCalMags,
photoCalMags,
rtol=1e-2)
# Test the transmission output
visitCatalog = butler.get('fgcmVisitCatalog')
lutCat = butler.get('fgcmLookUpTable')
testTrans = butler.get(
'transmission_atmosphere_fgcm',
dataId={visitDataRefName: visitCatalog[0]['visit']})
testResp = testTrans.sampleAt(position=afwGeom.Point2D(0, 0),
wavelengths=lutCat[0]['atmlambda'])
# The fit to be roughly consistent with the standard, although the
# airmass is taken into account even with the "frozen" atmosphere.
# This is also a rough comparison, because the interpolation does
# not work well with such a coarse look-up table used for the test.
self.assertFloatsAlmostEqual(testResp,
lutCat[0]['atmstdtrans'],
atol=0.06)
# The second should be close to the first, but there is the airmass
# difference so they aren't identical
testTrans2 = butler.get(
'transmission_atmosphere_fgcm',
dataId={visitDataRefName: visitCatalog[1]['visit']})
testResp2 = testTrans2.sampleAt(position=afwGeom.Point2D(0, 0),
wavelengths=lutCat[0]['atmlambda'])
self.assertFloatsAlmostEqual(testResp, testResp2, atol=1e-4)
def selectMatches(self, matches, sourceKeys, filterName, frame=None):
"""!Select reference/source matches according the criteria specified in the config.
\param[in] matches ReferenceMatchVector (not modified)
\param[in] sourceKeys Struct of source catalog keys, as returned by getSourceKeys()
\param[in] filterName name of camera filter; used to obtain the reference flux field
\param[in] frame ds9 frame number to use for debugging display
if frame is non-None, display information about trimmed objects on that ds9 frame:
- Bad: red x
- Unsuitable objects: blue + (and a cyan o if a galaxy)
- Failed flux cut: magenta *
\return a \link lsst.afw.table.ReferenceMatchVector\endlink that contains only the selected matches.
If a schema was passed during task construction, a flag field will be set on sources
in the selected matches.
\throws ValueError There are no valid matches.
"""
self.log.logdebug("Number of input matches: %d" % (len(matches)))
if len(matches) == 0:
raise ValueError("No input matches")
# Only use stars for which the flags indicate the photometry is good.
afterFlagCutInd = [i for i, m in enumerate(matches) if checkSourceFlags(m.second, sourceKeys)]
afterFlagCut = [matches[i] for i in afterFlagCutInd]
self.log.logdebug("Number of matches after source flag cuts: %d" % (len(afterFlagCut)))
if len(afterFlagCut) != len(matches):
if frame is not None:
with ds9.Buffering():
for i, m in enumerate(matches):
if i not in afterFlagCutInd:
x, y = m.second.getCentroid()
ds9.dot("x", x, y, size=4, frame=frame, ctype=ds9.RED)
matches = afterFlagCut
if len(matches) == 0:
raise ValueError("All matches eliminated by source flags")
refSchema = matches[0].first.schema
try:
photometricKey = refSchema.find("photometric").key
try:
resolvedKey = refSchema.find("resolved").key
except:
resolvedKey = None
try:
variableKey = refSchema.find("variable").key
except:
variableKey = None
except:
self.log.warn("No 'photometric' flag key found in reference schema.")
photometricKey = None
if photometricKey is not None:
afterRefCutInd = [i for i, m in enumerate(matches) if m.first.get(photometricKey)]
afterRefCut = [matches[i] for i in afterRefCutInd]
if len(afterRefCut) != len(matches):
if frame is not None:
with ds9.Buffering():
for i, m in enumerate(matches):
if i not in afterRefCutInd:
x, y = m.second.getCentroid()
ds9.dot("+", x, y, size=4, frame=frame, ctype=ds9.BLUE)
if resolvedKey and m.first.get(resolvedKey):
ds9.dot("o", x, y, size=6, frame=frame, ctype=ds9.CYAN)
if variableKey and m.first.get(variableKey):
ds9.dot("o", x, y, size=6, frame=frame, ctype=ds9.MAGENTA)
matches = afterRefCut
self.log.logdebug("Number of matches after reference catalog cuts: %d" % (len(matches)))
if len(matches) == 0:
raise RuntimeError("No sources remain in match list after reference catalog cuts.")
fluxName = getRefFluxField(refSchema, filterName)
fluxKey = refSchema.find(fluxName).key
if self.config.magLimit is not None:
fluxLimit = fluxFromABMag(self.config.magLimit)
afterMagCutInd = [i for i, m in enumerate(matches) if (m.first.get(fluxKey) > fluxLimit
and m.second.getPsfFlux() > 0.0)]
else:
afterMagCutInd = [i for i, m in enumerate(matches) if m.second.getPsfFlux() > 0.0]
afterMagCut = [matches[i] for i in afterMagCutInd]
if len(afterMagCut) != len(matches):
if frame is not None:
with ds9.Buffering():
for i, m in enumerate(matches):
if i not in afterMagCutInd:
x, y = m.second.getCentroid()
ds9.dot("*", x, y, size=4, frame=frame, ctype=ds9.MAGENTA)
matches = afterMagCut
self.log.logdebug("Number of matches after magnitude limit cuts: %d" % (len(matches)))
if len(matches) == 0:
raise RuntimeError("No sources remaining in match list after magnitude limit cuts.")
if frame is not None:
with ds9.Buffering():
for m in matches:
x, y = m.second.getCentroid()
ds9.dot("o", x, y, size=4, frame=frame, ctype=ds9.GREEN)
result = afwTable.ReferenceMatchVector()
for m in matches:
if self.outputField is not None:
m.second.set(self.outputField, True)
result.append(m)
return result
def selectMatches(self, matches, sourceKeys, filterName, frame=None):
"""!Select reference/source matches according the criteria specified in the config.
\param[in] matches ReferenceMatchVector (not modified)
\param[in] sourceKeys Struct of source catalog keys, as returned by getSourceKeys()
\param[in] filterName name of camera filter; used to obtain the reference flux field
\param[in] frame ds9 frame number to use for debugging display
if frame is non-None, display information about trimmed objects on that ds9 frame:
- Bad: red x
- Unsuitable objects: blue + (and a cyan o if a galaxy)
- Failed flux cut: magenta *
\return a \link lsst.afw.table.ReferenceMatchVector\endlink that contains only the selected matches.
If a schema was passed during task construction, a flag field will be set on sources
in the selected matches.
\throws ValueError There are no valid matches.
"""
self.log.debug("Number of input matches: %d", len(matches))
if self.config.doSelectUnresolved:
# Select only resolved sources if asked to do so.
matches = [
m for m in matches
if self.isUnresolved(m.second, sourceKeys.starGal)
]
self.log.debug(
"Number of matches after culling resolved sources: %d",
len(matches))
if len(matches) == 0:
raise ValueError("No input matches")
for m in matches:
if self.candidateKey is not None:
m.second.set(self.candidateKey, True)
# Only use stars for which the flags indicate the photometry is good.
afterFlagCutInd = [
i for i, m in enumerate(matches)
if checkSourceFlags(m.second, sourceKeys)
]
afterFlagCut = [matches[i] for i in afterFlagCutInd]
self.log.debug("Number of matches after source flag cuts: %d",
len(afterFlagCut))
if len(afterFlagCut) != len(matches):
if frame is not None:
with ds9.Buffering():
for i, m in enumerate(matches):
if i not in afterFlagCutInd:
x, y = m.second.getCentroid()
ds9.dot("x",
x,
y,
size=4,
frame=frame,
ctype=ds9.RED)
matches = afterFlagCut
if len(matches) == 0:
raise ValueError("All matches eliminated by source flags")
refSchema = matches[0].first.schema
try:
photometricKey = refSchema.find("photometric").key
try:
resolvedKey = refSchema.find("resolved").key
except:
resolvedKey = None
try:
variableKey = refSchema.find("variable").key
except:
variableKey = None
except:
self.log.warn(
"No 'photometric' flag key found in reference schema.")
photometricKey = None
if photometricKey is not None:
afterRefCutInd = [
i for i, m in enumerate(matches) if m.first.get(photometricKey)
]
afterRefCut = [matches[i] for i in afterRefCutInd]
if len(afterRefCut) != len(matches):
if frame is not None:
with ds9.Buffering():
for i, m in enumerate(matches):
if i not in afterRefCutInd:
x, y = m.second.getCentroid()
ds9.dot("+",
x,
y,
size=4,
frame=frame,
ctype=ds9.BLUE)
if resolvedKey and m.first.get(resolvedKey):
ds9.dot("o",
x,
y,
size=6,
frame=frame,
ctype=ds9.CYAN)
if variableKey and m.first.get(variableKey):
ds9.dot("o",
x,
y,
size=6,
frame=frame,
ctype=ds9.MAGENTA)
matches = afterRefCut
self.log.debug("Number of matches after reference catalog cuts: %d",
len(matches))
if len(matches) == 0:
raise RuntimeError(
"No sources remain in match list after reference catalog cuts."
)
fluxName = getRefFluxField(refSchema, filterName)
fluxKey = refSchema.find(fluxName).key
if self.config.magLimit is not None:
fluxLimit = fluxFromABMag(self.config.magLimit)
afterMagCutInd = [
i for i, m in enumerate(matches)
if (m.first.get(fluxKey) > fluxLimit
and m.second.getPsfFlux() > 0.0)
]
else:
afterMagCutInd = [
i for i, m in enumerate(matches) if m.second.getPsfFlux() > 0.0
]
afterMagCut = [matches[i] for i in afterMagCutInd]
if len(afterMagCut) != len(matches):
if frame is not None:
with ds9.Buffering():
for i, m in enumerate(matches):
if i not in afterMagCutInd:
x, y = m.second.getCentroid()
ds9.dot("*",
x,
y,
size=4,
frame=frame,
ctype=ds9.MAGENTA)
matches = afterMagCut
self.log.debug("Number of matches after magnitude limit cuts: %d",
len(matches))
if len(matches) == 0:
raise RuntimeError(
"No sources remaining in match list after magnitude limit cuts."
)
if frame is not None:
with ds9.Buffering():
for m in matches:
x, y = m.second.getCentroid()
ds9.dot("o", x, y, size=4, frame=frame, ctype=ds9.GREEN)
result = []
for m in matches:
if self.usedKey is not None:
m.second.set(self.usedKey, True)
result.append(m)
return result
