Coverage for python/lsst/obs/base/camera_tests.py: 26%
39 statements
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« prev ^ index » next coverage.py v7.2.1, created at 2023-03-12 01:53 -0800
1# This file is part of obs_base.
2#
3# Developed for the LSST Data Management System.
4# This product includes software developed by the LSST Project
5# (https://www.lsst.org).
6# See the COPYRIGHT file at the top-level directory of this distribution
7# for details of code ownership.
8#
9# This program is free software: you can redistribute it and/or modify
10# it under the terms of the GNU General Public License as published by
11# the Free Software Foundation, either version 3 of the License, or
12# (at your option) any later version.
13#
14# This program is distributed in the hope that it will be useful,
15# but WITHOUT ANY WARRANTY; without even the implied warranty of
16# MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
17# GNU General Public License for more details.
18#
19# You should have received a copy of the GNU General Public License
20# along with this program. If not, see <https://www.gnu.org/licenses/>.
22import abc
23import collections
24import math
26import lsst.geom
27from lsst.afw.cameraGeom import FOCAL_PLANE, FIELD_ANGLE
29__all__ = ["CameraTests"]
32class CameraTests(metaclass=abc.ABCMeta):
33 """Tests that the butler returns a useable Camera.
35 In the subclasses's setUp():
36 * Call setUp_camera() to fill in required parameters.
37 """
39 def setUp_camera(self,
40 camera_name=None,
41 n_detectors=None,
42 first_detector_name=None,
43 plate_scale=None,
44 ):
45 """Set up the necessary variables for camera tests.
47 Parameters
48 ----------
50 camera_name : `str`
51 name of this camera
52 n_detectors : `int`
53 number of detectors in this camera
54 first_detector_name : `str`
55 name of the first detector in this camera
56 plate_scale : `lsst.geom.Angle`
57 plate scale at center of focal plane, as angle-on-sky/mm
58 """
59 fields = ['camera_name',
60 'n_detectors',
61 'first_detector_name',
62 'plate_scale',
63 ]
64 CameraData = collections.namedtuple("CameraData", fields)
65 self.camera_data = CameraData(camera_name=camera_name,
66 n_detectors=n_detectors,
67 first_detector_name=first_detector_name,
68 plate_scale=plate_scale,
69 )
71 def test_iterable(self):
72 """Simplest camera test: can we get a Camera instance, and does
73 iterating return Detectors?"""
74 camera = self.butler.get('camera', immediate=True)
75 self.assertIsInstance(camera, lsst.afw.cameraGeom.Camera)
76 for detector in camera:
77 msg = "Failed for detector={}".format(detector)
78 self.assertIsInstance(detector, lsst.afw.cameraGeom.Detector, msg=msg)
80 def test_camera_butler(self):
81 """Check that the butler returns the right type of camera."""
82 camera = self.butler.get('camera', immediate=True)
83 self.assertEqual(camera.getName(), self.camera_data.camera_name)
84 self.assertEqual(len(camera), self.camera_data.n_detectors)
85 self.assertEqual(next(iter(camera)).getName(), self.camera_data.first_detector_name)
87 def test_plate_scale(self):
88 """Check the plate scale at center of focal plane
90 Check plate_scale using the FOCAL_PLANE to FIELD_ANGLE transform
91 from the camera.
92 """
93 plate_scale = self.camera_data.plate_scale
94 self.assertIsNotNone(plate_scale)
95 camera = self.butler.get('camera', immediate=True)
96 focalPlaneToFieldAngle = camera.getTransformMap().getTransform(FOCAL_PLANE, FIELD_ANGLE)
97 focalPlaneRadiusMm = 0.001 # an offset small enough to be in the linear regime
98 for offsetAngleRad in (0.0, 0.65, 1.3): # direction of offset; a few arbitrary angles
99 cosAng = math.cos(offsetAngleRad)
100 sinAng = math.sin(offsetAngleRad)
101 fieldAngleRadians = focalPlaneToFieldAngle.applyForward(
102 lsst.geom.Point2D(cosAng * focalPlaneRadiusMm, sinAng * focalPlaneRadiusMm))
103 fieldAngleRadius = math.hypot(*fieldAngleRadians) * lsst.geom.radians
104 measuredScale1 = fieldAngleRadius / focalPlaneRadiusMm
105 self.assertAnglesAlmostEqual(measuredScale1, plate_scale)
107 focalPlanePos = focalPlaneToFieldAngle.applyInverse(
108 lsst.geom.Point2D(fieldAngleRadius.asRadians() * cosAng,
109 fieldAngleRadius.asRadians() * sinAng))
110 focalPlaneRadiusMm2 = math.hypot(*focalPlanePos)
111 measureScale2 = fieldAngleRadius / focalPlaneRadiusMm2
112 self.assertAnglesAlmostEqual(measureScale2, plate_scale)