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# 

# LSST Data Management System 

# Copyright 2008, 2009, 2010 LSST Corporation. 

# 

# This product includes software developed by the 

# LSST Project (http://www.lsst.org/). 

# 

# This program is free software: you can redistribute it and/or modify 

# it under the terms of the GNU General Public License as published by 

# the Free Software Foundation, either version 3 of the License, or 

# (at your option) any later version. 

# 

# This program is distributed in the hope that it will be useful, 

# but WITHOUT ANY WARRANTY; without even the implied warranty of 

# MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the 

# GNU General Public License for more details. 

# 

# You should have received a copy of the LSST License Statement and 

# the GNU General Public License along with this program. If not, 

# see <http://www.lsstcorp.org/LegalNotices/>. 

# 

import math 

import os 

import unittest 

 

import lsst.geom 

import lsst.afw.geom as afwGeom 

import lsst.afw.table as afwTable 

import lsst.utils.tests 

from lsst.meas.algorithms import LoadReferenceObjectsTask 

import lsst.meas.astrom.sip.genDistortedImage as distort 

import lsst.meas.astrom as measAstrom 

 

 

class TestMatchPessimisticB(unittest.TestCase): 

 

def setUp(self): 

 

self.config = measAstrom.MatchPessimisticBTask.ConfigClass() 

self.config.minMatchDistPixels = 3.0 

self.MatchPessimisticB = measAstrom.MatchPessimisticBTask( 

config=self.config) 

 

self.wcs = afwGeom.makeSkyWcs(crpix=lsst.geom.Point2D(791.4, 559.7), 

crval=lsst.geom.SpherePoint(36.930640, -4.939560, lsst.geom.degrees), 

cdMatrix=afwGeom.makeCdMatrix(scale=5.17e-5*lsst.geom.degrees)) 

self.distortedWcs = self.wcs 

 

self.filename = os.path.join(os.path.dirname(__file__), "cat.xy.fits") 

self.tolArcsec = .4 

self.tolPixel = .1 

 

def tearDown(self): 

del self.config 

del self.MatchPessimisticB 

del self.wcs 

del self.distortedWcs 

 

def testLinearXDistort(self): 

self.singleTestInstance(self.filename, distort.linearXDistort) 

 

def testLinearYDistort(self): 

self.singleTestInstance(self.filename, distort.linearYDistort) 

 

def testQuadraticDistort(self): 

self.singleTestInstance(self.filename, distort.quadraticDistort) 

 

def testLargeDistortion(self): 

# This transform is about as extreme as I can get: 

# using 0.0005 in the last value appears to produce numerical issues. 

 

# It produces a maximum deviation of 459 pixels, which should be 

# sufficient. 

pixelsToTanPixels = afwGeom.makeRadialTransform([0.0, 1.1, 0.0004]) 

self.distortedWcs = afwGeom.makeModifiedWcs(pixelTransform=pixelsToTanPixels, 

wcs=self.wcs, 

modifyActualPixels=False) 

 

def applyDistortion(src): 

out = src.table.copyRecord(src) 

out.set(out.table.getCentroidKey(), 

pixelsToTanPixels.applyInverse(src.getCentroid())) 

return out 

 

self.singleTestInstance(self.filename, applyDistortion) 

 

def singleTestInstance(self, filename, distortFunc, doPlot=False): 

sourceCat = self.loadSourceCatalog(self.filename) 

refCat = self.computePosRefCatalog(sourceCat) 

distortedCat = distort.distortList(sourceCat, distortFunc) 

 

94 ↛ 95line 94 didn't jump to line 95, because the condition on line 94 was never true if doPlot: 

import matplotlib.pyplot as plt 

 

undistorted = [self.wcs.skyToPixel(self.distortedWcs.pixelToSky(ss.getCentroid())) 

for ss in distortedCat] 

refs = [self.wcs.skyToPixel(ss.getCoord()) for ss in refCat] 

 

def plot(catalog, symbol): 

plt.plot([ss.getX() for ss in catalog], 

[ss.getY() for ss in catalog], symbol) 

 

plot(distortedCat, 'b+') # Distorted positions: blue + 

plot(undistorted, 'g+') # Undistorted positions: green + 

plot(refs, 'rx') # Reference catalog: red x 

# The green + should overlap with the red x, because that's how 

# MatchPessimisticB does it. 

 

plt.show() 

 

sourceCat = distortedCat 

 

matchRes = self.MatchPessimisticB.matchObjectsToSources( 

refCat=refCat, 

sourceCat=sourceCat, 

wcs=self.distortedWcs, 

refFluxField="r_flux", 

) 

matches = matchRes.matches 

122 ↛ 123line 122 didn't jump to line 123, because the condition on line 122 was never true if doPlot: 

measAstrom.plotAstrometry(matches=matches, refCat=refCat, 

sourceCat=sourceCat) 

self.assertEqual(len(matches), 183) 

 

refCoordKey = afwTable.CoordKey(refCat.schema["coord"]) 

srcCoordKey = afwTable.CoordKey(sourceCat.schema["coord"]) 

refCentroidKey = afwTable.Point2DKey(refCat.getSchema()["centroid"]) 

maxDistErr = 0*lsst.geom.radians 

 

for refObj, source, distRad in matches: 

sourceCoord = source.get(srcCoordKey) 

refCoord = refObj.get(refCoordKey) 

predDist = sourceCoord.separation(refCoord) 

distErr = abs(predDist - distRad*lsst.geom.radians) 

maxDistErr = max(distErr, maxDistErr) 

 

139 ↛ 140line 139 didn't jump to line 140, because the condition on line 139 was never true if refObj.getId() != source.getId(): 

refCentroid = refObj.get(refCentroidKey) 

sourceCentroid = source.getCentroid() 

radius = math.hypot(*(refCentroid - sourceCentroid)) 

self.fail( 

"ID mismatch: %s at %s != %s at %s; error = %0.1f pix" % 

(refObj.getId(), refCentroid, source.getId(), 

sourceCentroid, radius)) 

 

self.assertLess(maxDistErr.asArcseconds(), 1e-7) 

 

def computePosRefCatalog(self, sourceCat): 

"""Generate a position reference catalog from a source catalog 

""" 

minimalPosRefSchema = LoadReferenceObjectsTask.makeMinimalSchema( 

filterNameList=["r"], 

addFluxSigma=True, 

) 

refCat = afwTable.SimpleCatalog(minimalPosRefSchema) 

refCat.reserve(len(sourceCat)) 

for source in sourceCat: 

refObj = refCat.addNew() 

refObj.setCoord(source.getCoord()) 

refObj.set("centroid_x", source.getX()) 

refObj.set("centroid_y", source.getY()) 

refObj.set("hasCentroid", True) 

refObj.set("r_flux", source.get("slot_ApFlux_flux")) 

refObj.set("r_fluxSigma", source.get("slot_ApFlux_fluxSigma")) 

refObj.setId(source.getId()) 

return refCat 

 

def loadSourceCatalog(self, filename): 

"""Load a list of xy points from a file, set coord, and return a 

SourceSet of points 

 

""" 

sourceCat = afwTable.SourceCatalog.readFits(filename) 

aliasMap = sourceCat.schema.getAliasMap() 

aliasMap.set("slot_ApFlux", "base_PsfFlux") 

fluxKey = sourceCat.schema["slot_ApFlux_flux"].asKey() 

fluxSigmaKey = sourceCat.schema["slot_ApFlux_fluxSigma"].asKey() 

 

# Source x,y positions are ~ (500,1500) x (500,1500) 

centroidKey = sourceCat.table.getCentroidKey() 

for src in sourceCat: 

adjCentroid = src.get(centroidKey) - lsst.geom.Extent2D(500, 500) 

src.set(centroidKey, adjCentroid) 

src.set(fluxKey, 1000) 

src.set(fluxSigmaKey, 1) 

 

# Set catalog coord 

for src in sourceCat: 

src.updateCoord(self.wcs) 

return sourceCat 

 

 

class MemoryTester(lsst.utils.tests.MemoryTestCase): 

pass 

 

 

def setup_module(module): 

lsst.utils.tests.init() 

 

 

203 ↛ 205line 203 didn't jump to line 205, because the condition on line 203 was never trueif __name__ == "__main__": 

 

lsst.utils.tests.init() 

unittest.main()