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# 

# LSST Data Management System 

# 

# Copyright 2008-2016 AURA/LSST. 

# 

# 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 <https://www.lsstcorp.org/LegalNotices/>. 

# 

 

import unittest 

import numpy as np 

 

import lsst.afw.table as afwTable 

from lsst.meas.algorithms import sourceSelector 

import lsst.meas.base.tests 

import lsst.utils.tests 

 

# badFlags are flags that, if the bad flag is set the object should be 

# immediately thrown out. This is as opposed to combinations of flags 

# signifying good or bad data. Such flags should then be a part of the 

# isGood test. 

badFlags = ["base_PixelFlags_flag_edge", 

"base_PixelFlags_flag_interpolatedCenter", 

"base_PixelFlags_flag_saturated", 

"base_PixelFlags_flag_saturatedCenter", 

"base_PixelFlags_flag_crCenter", 

"base_PixelFlags_flag_bad", 

"slot_Centroid_flag", 

"slot_ApFlux_flag", 

] 

 

# goodFlags are flags that should NOT cause the object to be immediately 

# thrown out, despite their possibly ominous-sounding names. 

goodFlags = ["base_PixelFlags_flag_interpolated"] 

 

 

def add_good_source(src, num=0): 

"""Insert a likely-good source into the catalog.""" 

""" 

num is added to various values to distinguish them in catalogs with multiple objects. 

""" 

src.addNew() 

src['coord_ra'][-1] = 1. + num 

src['coord_dec'][-1] = 2. + num 

src['slot_Centroid_x'][-1] = 10. + num 

src['slot_Centroid_y'][-1] = 20. + num 

src['slot_Centroid_xSigma'][-1] = 1. + num 

src['slot_Centroid_ySigma'][-1] = 2. + num 

src['slot_Centroid_x_y_Cov'][-1] = 3. + num 

src['slot_ApFlux_flux'][-1] = 100. + num 

src['slot_ApFlux_fluxSigma'][-1] = 1. 

 

 

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

 

def setUp(self): 

schema = lsst.meas.base.tests.TestDataset.makeMinimalSchema() 

schema.addField("slot_ApFlux_flux", type=np.float64) 

schema.addField("slot_ApFlux_fluxSigma", type=np.float64) 

for flag in badFlags + goodFlags: 

schema.addField(flag, type="Flag") 

 

self.src = afwTable.SourceCatalog(schema) 

self.sourceSelector = sourceSelector.sourceSelectorRegistry['astrometry']() 

 

def tearDown(self): 

del self.src 

del self.sourceSelector 

 

def testSelectSources_good(self): 

for i in range(5): 

add_good_source(self.src, i) 

for flag in goodFlags: 

self.src[i].set(flag, True) 

result = self.sourceSelector.selectSources(self.src) 

# TODO: assertEqual doesn't work correctly on source catalogs. 

# self.assertEqual(self.src[result.selected], self.src) 

for x in self.src['id']: 

self.assertIn(x, self.src[result.selected]['id']) 

 

def testSelectSources_bad(self): 

for i, flag in enumerate(badFlags): 

add_good_source(self.src, i) 

self.src[i].set(flag, True) 

result = self.sourceSelector.selectSources(self.src) 

for i, x in enumerate(self.src['id']): 

self.assertNotIn(x, self.src[result.selected]['id'], "should not have found %s" % badFlags[i]) 

 

def testSelectSources_bad_centroid(self): 

"""NaN centroids should just assert.""" 

add_good_source(self.src, 1) 

self.src[0].set('slot_Centroid_x', np.nan) 

with self.assertRaises(AssertionError): 

self.sourceSelector.selectSources(self.src) 

self.src[0].set('slot_Centroid_x', 5.0) 

self.src[0].set('slot_Centroid_y', np.nan) 

with self.assertRaises(AssertionError): 

self.sourceSelector.selectSources(self.src) 

 

def testSelectSources_bad_centroid_Sigma(self): 

"""Reject sources with NaN centroid_[xy]Sigma. 

Currently, there is no guarantee that a valid centroid_flag implies 

a finite variance.""" 

add_good_source(self.src, 1) 

add_good_source(self.src, 2) 

self.src[0].set('slot_Centroid_xSigma', np.nan) 

self.src[1].set('slot_Centroid_ySigma', np.nan) 

result = self.sourceSelector.selectSources(self.src) 

self.assertNotIn(self.src['id'][0], self.src[result.selected]['id']) 

self.assertNotIn(self.src['id'][1], self.src[result.selected]['id']) 

 

def testSelectSources_is_parent(self): 

add_good_source(self.src, 1) 

self.src[0].set('parent', 1) 

result = self.sourceSelector.selectSources(self.src) 

self.assertNotIn(self.src['id'][0], self.src[result.selected]['id']) 

 

def testSelectSources_has_children(self): 

add_good_source(self.src, 1) 

self.src[0].set('deblend_nChild', 1) 

result = self.sourceSelector.selectSources(self.src) 

self.assertNotIn(self.src['id'][0], self.src[result.selected]['id']) 

 

def testSelectSources_highSN_cut(self): 

add_good_source(self.src, 1) 

add_good_source(self.src, 2) 

self.src['slot_ApFlux_flux'][0] = 20. 

self.src['slot_ApFlux_flux'][1] = 1000. 

 

self.sourceSelector.config.minSnr = 100 

result = self.sourceSelector.selectSources(self.src) 

self.assertNotIn(self.src[0]['id'], self.src[result.selected]['id']) 

self.assertIn(self.src[1]['id'], self.src[result.selected]['id']) 

 

def testSelectSources_no_SN_cut(self): 

self.sourceSelector.config.minSnr = 0 

add_good_source(self.src, 1) 

self.src['slot_ApFlux_flux'][0] = 0 

result = self.sourceSelector.selectSources(self.src) 

self.assertIn(self.src[0]['id'], self.src[result.selected]['id']) 

 

 

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

pass 

 

 

def setup_module(module): 

lsst.utils.tests.init() 

 

 

165 ↛ 166line 165 didn't jump to line 166, because the condition on line 165 was never trueif __name__ == "__main__": 

lsst.utils.tests.init() 

unittest.main()