Functions
def	disturbRaDec (num, mu=0.6, sigma=0.6)

def	makeBlendedCat (fakeCat, realCat, raCol='ra', decCol='dec', sigma=0.6, mu=0.6)

Variables
	parser = argparse.ArgumentParser()

	help

	dest

	default

	type

	args = parser.parse_args()

	raCol

	decCol

	sigma

	mu

Detailed Description

Make a catalog of fakes that are highly blended.

Function Documentation

◆ disturbRaDec()

def lsst.synpipe.makeBlendedCat.disturbRaDec	(	num,
		mu = `0.6`,
		sigma = `0.6`
	)

Disturb the coordinate a little bit.

Definition at line 11 of file makeBlendedCat.py.

 def disturbRaDec(num, mu=0.6, sigma=0.6):
     """Disturb the coordinate a little bit."""
     return (np.random.normal(mu, sigma, num) / 3600.0)
 
 

◆ makeBlendedCat()

def lsst.synpipe.makeBlendedCat.makeBlendedCat	(	fakeCat,
		realCat,
		raCol = `'ra'`,
		decCol = `'dec'`,
		sigma = `0.6`,
		mu = `0.6`
	)

Make a highly blended version of fake catalog.

Definition at line 17 of file makeBlendedCat.py.

                    sigma=0.6, mu=0.6):
     """Make a highly blended version of fake catalog."""
     # Fake catalog
     if not os.path.isfile(fakeCat):
         raise Exception('# Can not find input fake catalog : %s' % fakeCat)
     else:
         fakeTab = Table.read(fakeCat, format='fits')
         nFake = len(fakeTab)
         print("# There are %d fake galaxies in the catalog" % nFake)
     # Name of the output catalog
     blendTab = fakeCat.replace('.fits', '_highb.fits')
 
     # Real catalog
     if not os.path.isfile(realCat):
         raise Exception('# Can not find input real catalog : %s' % realCat)
     else:
         realTab = Table.read(realCat, format='fits')
         nReal = len(realTab)
         print("# There are %d real galaxies in the catalog" % nReal)
 
     # Randomly select nFake galaxies from the realCat
     indices = random.sample(list(range(nReal)), nFake)
 
     # Replace the RA, DEC with a small shift
     fakeTab.add_column(Column(realTab[indices][raCol], name='RA_ori'))
     fakeTab.add_column(Column(realTab[indices][decCol], name='Dec_ori'))
 
     fakeTab['RA'] = (realTab[indices][raCol] + disturbRaDec(nFake,
                                                             mu=mu,
                                                             sigma=sigma))
     fakeTab['Dec'] = (realTab[indices][decCol] + disturbRaDec(nFake,
                                                               mu=mu,
                                                               sigma=sigma))
 
     # Save the new catalog
     fakeTab.write(blendTab, format='fits', overwrite=True)
 
     return fakeTab
 
 

Variable Documentation

◆ args

lsst.synpipe.makeBlendedCat.args = parser.parse_args()

Definition at line 75 of file makeBlendedCat.py.

◆ decCol

lsst.synpipe.makeBlendedCat.decCol

Definition at line 78 of file makeBlendedCat.py.

◆ default

lsst.synpipe.makeBlendedCat.default

Definition at line 64 of file makeBlendedCat.py.

◆ dest

lsst.synpipe.makeBlendedCat.dest

Definition at line 62 of file makeBlendedCat.py.

◆ help

lsst.synpipe.makeBlendedCat.help

Definition at line 60 of file makeBlendedCat.py.

◆ mu

lsst.synpipe.makeBlendedCat.mu

Definition at line 79 of file makeBlendedCat.py.

◆ parser

lsst.synpipe.makeBlendedCat.parser = argparse.ArgumentParser()

Definition at line 59 of file makeBlendedCat.py.

◆ raCol

lsst.synpipe.makeBlendedCat.raCol