Coverage for tests/test_HealpixPixelization.py: 24%
90 statements
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« prev ^ index » next coverage.py v6.4.2, created at 2022-07-19 11:56 +0000
1#
2# LSST Data Management System
3# See COPYRIGHT file at the top of the source tree.
4#
5# This product includes software developed by the
6# LSST Project (http://www.lsst.org/).
7#
8# This program is free software: you can redistribute it and/or modify
9# it under the terms of the GNU General Public License as published by
10# the Free Software Foundation, either version 3 of the License, or
11# (at your option) any later version.
12#
13# This program is distributed in the hope that it will be useful,
14# but WITHOUT ANY WARRANTY; without even the implied warranty of
15# MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
16# GNU General Public License for more details.
17#
18# You should have received a copy of the LSST License Statement and
19# the GNU General Public License along with this program. If not,
20# see <https://www.lsstcorp.org/LegalNotices/>.
21#
22import pickle
23import unittest
25import healpy as hp
26import numpy as np
28try:
29 import yaml
30except ImportError:
31 yaml = None
33from lsst.sphgeom import Angle, Box, Circle, ConvexPolygon, HealpixPixelization, LonLat, UnitVector3d
36class HealpixPixelizationTestCase(unittest.TestCase):
37 def test_construction(self):
38 """Test construction of a HealpixPixelization."""
39 with self.assertRaises(ValueError):
40 HealpixPixelization(-1)
41 h1 = HealpixPixelization(5)
42 self.assertEqual(h1.level, 5)
43 self.assertEqual(h1.getLevel(), 5)
44 self.assertEqual(h1.nside, 32)
45 h2 = HealpixPixelization(6)
46 h3 = HealpixPixelization(h2.level)
47 self.assertNotEqual(h1, h2)
48 self.assertEqual(h2, h3)
50 def test_indexing(self):
51 """Test indexing of HealpixPixelization."""
52 h = HealpixPixelization(5)
53 vec = UnitVector3d(1, 1, 1)
54 lonlat = LonLat(vec)
55 pix = hp.ang2pix(
56 h.nside, lonlat.getLon().asDegrees(), lonlat.getLat().asDegrees(), lonlat=True, nest=True
57 )
58 self.assertEqual(h.index(UnitVector3d(1, 1, 1)), pix)
60 def test_pixel(self):
61 """Test pixel polygon of HealpixPixelization."""
62 h = HealpixPixelization(5)
63 pix_poly = h.pixel(10)
64 self.assertIsInstance(pix_poly, ConvexPolygon)
66 def test_envelope(self):
67 """Test envelope method of HealpixPixelization."""
68 # Make the hardest intersection: a region that _just_
69 # touches a healpix pixel.
70 h = HealpixPixelization(5)
71 pix = hp.ang2pix(h.nside, 50.0, 20.0, lonlat=True, nest=True)
73 corners = hp.boundaries(h.nside, pix, step=1, nest=True)
74 corners_ra, corners_dec = hp.vec2ang(corners.T, lonlat=True)
76 # Take the southernmost corner...
77 smost = np.argmin(corners_dec)
79 # Choose challenging comparison box corners:
80 ra_range = np.array([corners_ra[smost] - 0.5, corners_ra[smost] + 0.5])
81 dec_range = np.array([corners_dec[smost] - 0.5, corners_dec[smost] + 1e-8])
83 # Test the box region
84 box = Box(
85 point1=LonLat.fromDegrees(ra_range[0], dec_range[0]),
86 point2=LonLat.fromDegrees(ra_range[1], dec_range[1]),
87 )
88 # These pixels have been checked to completely overlap the region
89 self._check_envelope(h, box, [98, 99, 104, 105])
91 # Try a polygon region:
92 poly = ConvexPolygon(
93 [
94 UnitVector3d(LonLat.fromDegrees(ra_range[0], dec_range[0])),
95 UnitVector3d(LonLat.fromDegrees(ra_range[1], dec_range[0])),
96 UnitVector3d(LonLat.fromDegrees(ra_range[1], dec_range[1])),
97 UnitVector3d(LonLat.fromDegrees(ra_range[0], dec_range[1])),
98 UnitVector3d(LonLat.fromDegrees(ra_range[0], dec_range[0])),
99 ]
100 )
101 self._check_envelope(h, poly, [98, 99, 104, 105])
103 # Try a circle region
104 circle = Circle(
105 center=UnitVector3d(
106 LonLat.fromDegrees((ra_range[0] + ra_range[1]) / 2.0, (dec_range[0] + dec_range[1]) / 2.0)
107 ),
108 angle=Angle.fromDegrees((dec_range[1] - dec_range[0]) / 2.0),
109 )
110 self._check_envelope(h, circle, [98, 99, 104, 105])
112 def _check_envelope(self, pixelization, region, check_pixels):
113 """Check the envelope from a region.
115 Parameters
116 ----------
117 pixelization : `lsst.sphgeom.HealpixPixelization`
118 region : `lsst.sphgeom.Region`
119 check_pixels : `list` [`int`]
120 """
121 pixel_range = pixelization.envelope(region)
123 pixels = []
124 for r in pixel_range.ranges():
125 pixels.extend(range(r[0], r[1]))
127 self.assertEqual(pixels, check_pixels)
129 def test_interior(self):
130 """Test interior method of HealpixPixelization."""
132 h = HealpixPixelization(5)
133 pix = hp.ang2pix(h.nside, 50.0, 20.0, lonlat=True, nest=True)
135 corners = hp.boundaries(h.nside, pix, step=1, nest=True)
136 corners_ra, corners_dec = hp.vec2ang(corners.T, lonlat=True)
138 ra_range = np.array([corners_ra.min() - 1.0, corners_ra.max() + 1.0])
139 dec_range = np.array([corners_dec.min() - 1.0, corners_dec.max() + 1.0])
141 # Test the box region
142 box = Box(
143 point1=LonLat.fromDegrees(ra_range[0], dec_range[0]),
144 point2=LonLat.fromDegrees(ra_range[1], dec_range[1]),
145 )
146 # These pixels have been checked to completely overlap the region
147 self._check_interior(h, box, [pix])
149 # Try a polygon region:
150 poly = ConvexPolygon(
151 [
152 UnitVector3d(LonLat.fromDegrees(ra_range[0], dec_range[0])),
153 UnitVector3d(LonLat.fromDegrees(ra_range[1], dec_range[0])),
154 UnitVector3d(LonLat.fromDegrees(ra_range[1], dec_range[1])),
155 UnitVector3d(LonLat.fromDegrees(ra_range[0], dec_range[1])),
156 UnitVector3d(LonLat.fromDegrees(ra_range[0], dec_range[0])),
157 ]
158 )
159 self._check_interior(h, poly, [pix])
161 # Try a circle region
162 circle = Circle(
163 center=UnitVector3d(
164 LonLat.fromDegrees((ra_range[0] + ra_range[1]) / 2.0, (dec_range[0] + dec_range[1]) / 2.0)
165 ),
166 angle=Angle.fromDegrees(2.5),
167 )
168 self._check_interior(h, circle, [pix])
170 def _check_interior(self, pixelization, region, check_pixels):
171 """Check the interior from a region.
173 Parameters
174 ----------
175 pixelization : `lsst.sphgeom.HealpixPixelization`
176 region : `lsst.sphgeom.Region`
177 check_pixels : `list` [`int`]
178 """
179 pixel_range = pixelization.interior(region)
181 pixels = []
182 for r in pixel_range.ranges():
183 pixels.extend(range(r[0], r[1]))
185 self.assertEqual(pixels, check_pixels)
187 def test_index_to_string(self):
188 """Test converting index to string of HealpixPixelization."""
189 h = HealpixPixelization(5)
190 self.assertEqual(h.toString(0), str(0))
191 self.assertEqual(h.toString(100), str(100))
193 def test_string(self):
194 """Test string representation of HealpixPixelization."""
195 h = HealpixPixelization(5)
196 self.assertEqual(str(h), "HealpixPixelization(5)")
197 self.assertEqual(str(h), repr(h))
198 self.assertEqual(h, eval(repr(h), dict(HealpixPixelization=HealpixPixelization)))
200 def test_pickle(self):
201 """Test pickling of HealpixPixelization."""
202 a = HealpixPixelization(5)
203 b = pickle.loads(pickle.dumps(a))
204 self.assertEqual(a, b)
206 @unittest.skipIf(not yaml, "YAML module can not be imported")
207 def test_yaml(self):
208 """Test yaml representation of HealpixPixelization."""
209 a = HealpixPixelization(5)
210 b = yaml.safe_load(yaml.dump(a))
211 self.assertEqual(a, b)
214if __name__ == "__main__": 214 ↛ 215line 214 didn't jump to line 215, because the condition on line 214 was never true
215 unittest.main()