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# 

# LSST Data Management System 

# Copyright 2008-2017 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 os.path 

import math 

import unittest 

 

import lsst.utils.tests 

import lsst.geom 

import lsst.afw.geom as afwGeom 

import lsst.afw.table as afwTable 

import lsst.afw.image as afwImage 

import lsst.meas.base as measBase 

from lsst.meas.extensions.astrometryNet import AstrometryNetDataConfig, \ 

ANetAstrometryTask, LoadAstrometryNetObjectsTask 

from test_findAstrometryNetDataDir import setupAstrometryNetDataDir 

 

 

class TestAstrometricSolver(lsst.utils.tests.TestCase): 

 

def setUp(self): 

self.datapath = setupAstrometryNetDataDir('photocal') 

 

self.bbox = lsst.geom.Box2I(lsst.geom.Point2I(0, 0), lsst.geom.Extent2I(3001, 3001)) 

crpix = lsst.geom.Box2D(self.bbox).getCenter() 

self.tanWcs = afwGeom.makeSkyWcs(crpix=crpix, 

crval=lsst.geom.SpherePoint(215.5, 53.0, lsst.geom.degrees), 

cdMatrix=afwGeom.makeCdMatrix(scale=5.1e-5*lsst.geom.degrees)) 

self.exposure = afwImage.ExposureF(self.bbox) 

self.exposure.setWcs(self.tanWcs) 

self.exposure.setFilter(afwImage.Filter("r", True)) 

andConfig = AstrometryNetDataConfig() 

andConfig.load(os.path.join(self.datapath, 'andConfig2.py')) 

andConfig.magErrorColumnMap = {} 

self.refObjLoader = LoadAstrometryNetObjectsTask(andConfig=andConfig) 

 

def tearDown(self): 

del self.tanWcs 

del self.exposure 

del self.refObjLoader 

 

def testTrivial(self): 

"""Test fit with no distortion 

""" 

self.doTest(afwGeom.makeIdentityTransform()) 

 

def testRadial(self): 

"""Test fit with radial distortion 

 

The offset comes from the fact that the CCD is not centered 

""" 

self.doTest(afwGeom.makeRadialTransform([0, 1.01, 1e-7])) 

 

def makeSourceSchema(self): 

schema = afwTable.SourceTable.makeMinimalSchema() 

measBase.SingleFrameMeasurementTask(schema=schema) # expand the schema 

return schema 

 

def doTest(self, pixelsToTanPixels): 

"""Test using pixelsToTanPixels to distort the source positions 

""" 

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

modifyActualPixels=False) 

self.exposure.setWcs(distortedWcs) 

sourceCat = self.makeSourceCat(distortedWcs) 

print("number of stars =", len(sourceCat)) 

config = ANetAstrometryTask.ConfigClass() 

solver = ANetAstrometryTask(config=config, refObjLoader=self.refObjLoader, 

schema=self.makeSourceSchema()) 

results = solver.run( 

sourceCat=sourceCat, 

exposure=self.exposure, 

) 

fitWcs = self.exposure.getWcs() 

self.assertRaises(Exception, self.assertWcsAlmostEqualOverBBox, fitWcs, distortedWcs) 

self.assertWcsAlmostEqualOverBBox(distortedWcs, fitWcs, self.bbox, 

maxDiffSky=0.01*lsst.geom.arcseconds, maxDiffPix=0.02) 

 

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

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

maxAngSep = 0*lsst.geom.radians 

maxPixSep = 0 

for refObj, src, d in results.matches: 

refCoord = refObj.get(refCoordKey) 

refPixPos = fitWcs.skyToPixel(refCoord) 

srcCoord = src.get(srcCoordKey) 

srcPixPos = src.getCentroid() 

 

angSep = refCoord.separation(srcCoord) 

maxAngSep = max(maxAngSep, angSep) 

 

pixSep = math.hypot(*(srcPixPos-refPixPos)) 

maxPixSep = max(maxPixSep, pixSep) 

print("max angular separation = %0.4f arcsec" % (maxAngSep.asArcseconds(),)) 

print("max pixel separation = %0.3f" % (maxPixSep,)) 

self.assertLess(maxAngSep.asArcseconds(), 0.005) 

self.assertLess(maxPixSep, 0.03) 

 

# try again, but without fitting the WCS 

config.forceKnownWcs = True 

solverNoFit = ANetAstrometryTask(config=config, refObjLoader=self.refObjLoader, 

schema=self.makeSourceSchema()) 

self.exposure.setWcs(distortedWcs) 

noFitResults = solverNoFit.run( 

sourceCat=sourceCat, 

exposure=self.exposure, 

) 

self.assertGreater(len(noFitResults.refCat), 300) 

 

def makeSourceCat(self, distortedWcs): 

"""Make a source catalog by reading the position reference stars and distorting the positions 

""" 

loadRes = self.refObjLoader.loadPixelBox(bbox=self.bbox, wcs=distortedWcs, filterName="r") 

refCat = loadRes.refCat 

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

refFluxRKey = refCat.schema["r_flux"].asKey() 

 

sourceSchema = self.makeSourceSchema() 

sourceCat = afwTable.SourceCatalog(sourceSchema) 

sourceCentroidKey = afwTable.Point2DKey(sourceSchema["slot_Centroid"]) 

sourceFluxKey = sourceSchema["slot_PsfFlux_flux"].asKey() 

sourceFluxSigmaKey = sourceSchema["slot_PsfFlux_fluxSigma"].asKey() 

 

sourceCat.reserve(len(refCat)) 

for refObj in refCat: 

src = sourceCat.addNew() 

src.set(sourceCentroidKey, refObj.get(refCentroidKey)) 

src.set(sourceFluxKey, refObj.get(refFluxRKey)) 

src.set(sourceFluxSigmaKey, refObj.get(refFluxRKey)/100) 

return sourceCat 

 

 

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

pass 

 

 

def setup_module(module): 

lsst.utils.tests.init() 

 

 

160 ↛ 161line 160 didn't jump to line 161, because the condition on line 160 was never trueif __name__ == "__main__": 

lsst.utils.tests.init() 

unittest.main()