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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 unittest 

 

import numpy as np 

 

import lsst.utils.tests 

import lsst.geom 

import lsst.afw.geom as afwGeom 

from lsst.meas.astrom import approximateWcs 

 

 

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

 

"""A test case for CreateWcsWithSip 

 

Use involves setting one class attribute: 

* MatchClass: match class, e.g. ReferenceMatch or SourceMatch 

""" 

 

def setUp(self): 

self.crPix = lsst.geom.Point2D(15000, 4000) 

dimd = lsst.geom.Extent2D(4000, 4000) 

bboxd = lsst.geom.Box2D(self.crPix - dimd/2, dimd) 

self.bbox = lsst.geom.Box2I(bboxd) 

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

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

cdMatrix=np.array([[5.10808596133527E-05, 1.85579539217196E-07], 

[-8.27440751733828E-07, -5.10281493481982E-05]])) 

 

def tearDown(self): 

del self.tanWcs 

 

def testTrivial(self): 

"""Add no distortion""" 

for order in (3, 4, 5, 6): 

self.doTest("testTrivial", afwGeom.makeIdentityTransform(), order=order, doPlot=False) 

 

def testRadial(self): 

"""Add a radial transform""" 

for order in (4, 5, 6): 

self.doTest("testRadial", afwGeom.makeRadialTransform([0, 1.001, 0.000003]), order=order, 

doPlot=False) 

 

def testWarnings(self): 

"""Test that approximateWcs raises a UserWarning when it cannot achieve desired tolerance""" 

radialTransform = afwGeom.makeRadialTransform([0, 2.0, 3.0]) 

wcs = afwGeom.makeModifiedWcs(pixelTransform=radialTransform, wcs=self.tanWcs, 

modifyActualPixels=False) 

with self.assertRaises(UserWarning): 

approximateWcs(wcs=wcs, bbox=self.bbox, order=2) 

 

def doTest(self, name, transform, order=3, doPlot=False): 

"""Add the specified distorting transform to a TAN WCS and fit it 

 

The resulting WCS pixelToSky method acts as follows: 

pixelToSky(transform.applyForward(pixels)) 

""" 

wcs = afwGeom.makeModifiedWcs(pixelTransform=transform, 

wcs=self.tanWcs, 

modifyActualPixels=False) 

 

fitWcs = approximateWcs( 

wcs=wcs, 

bbox=self.bbox, 

order=order, 

) 

 

88 ↛ 89line 88 didn't jump to line 89, because the condition on line 88 was never true if doPlot: 

self.plotWcs(wcs, fitWcs, self.bbox, transform) 

 

msg = "ERROR: %s failed with order %s" % (name, order) 

self.assertWcsAlmostEqualOverBBox(wcs, fitWcs, self.bbox, 

maxDiffSky=0.001*lsst.geom.arcseconds, maxDiffPix=0.02, msg=msg) 

 

def plotWcs(self, wcs0, wcs1, bbox, transform): 

import matplotlib.pyplot as plt 

bboxd = lsst.geom.Box2D(bbox) 

x0Arr = [] 

y0Arr = [] 

x1Arr = [] 

y1Arr = [] 

x2Arr = [] 

y2Arr = [] 

for x in np.linspace(bboxd.getMinX(), bboxd.getMaxX(), 10): 

for y in np.linspace(bboxd.getMinY(), bboxd.getMaxY(), 10): 

pixelPos0 = lsst.geom.Point2D(x, y) 

skyCoord = wcs0.pixelToSky(pixelPos0) 

pixelPos1 = wcs1.skyToPixel(skyCoord) 

distortedPos = transform.applyForward(pixelPos0) 

x0Arr.append(pixelPos0[0]) 

y0Arr.append(pixelPos0[1]) 

x1Arr.append(pixelPos1[0]) 

y1Arr.append(pixelPos1[1]) 

x2Arr.append(distortedPos[0]) 

y2Arr.append(distortedPos[1]) 

plt.plot(x0Arr, y0Arr, 'b+', x1Arr, y1Arr, 'rx', x2Arr, y2Arr, 'g.') 

 

plt.show() 

 

 

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

pass 

 

 

def setup_module(module): 

lsst.utils.tests.init() 

 

 

129 ↛ 130line 129 didn't jump to line 130, because the condition on line 129 was never trueif __name__ == "__main__": 

lsst.utils.tests.init() 

unittest.main()