Coverage for python/lsst/obs/base/camera_tests.py: 29%
39 statements
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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 FIELD_ANGLE, FOCAL_PLANE
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(
40 self,
41 camera_name=None,
42 n_detectors=None,
43 first_detector_name=None,
44 plate_scale=None,
45 ):
46 """Set up the necessary variables for camera tests.
48 Parameters
49 ----------
51 camera_name : `str`
52 name of this camera
53 n_detectors : `int`
54 number of detectors in this camera
55 first_detector_name : `str`
56 name of the first detector in this camera
57 plate_scale : `lsst.geom.Angle`
58 plate scale at center of focal plane, as angle-on-sky/mm
59 """
60 fields = [
61 "camera_name",
62 "n_detectors",
63 "first_detector_name",
64 "plate_scale",
65 ]
66 CameraData = collections.namedtuple("CameraData", fields)
67 self.camera_data = CameraData(
68 camera_name=camera_name,
69 n_detectors=n_detectors,
70 first_detector_name=first_detector_name,
71 plate_scale=plate_scale,
72 )
74 def test_iterable(self):
75 """Simplest camera test: can we get a Camera instance, and does
76 iterating return Detectors?"""
77 camera = self.butler.get("camera", immediate=True)
78 self.assertIsInstance(camera, lsst.afw.cameraGeom.Camera)
79 for detector in camera:
80 msg = "Failed for detector={}".format(detector)
81 self.assertIsInstance(detector, lsst.afw.cameraGeom.Detector, msg=msg)
83 def test_camera_butler(self):
84 """Check that the butler returns the right type of camera."""
85 camera = self.butler.get("camera", immediate=True)
86 self.assertEqual(camera.getName(), self.camera_data.camera_name)
87 self.assertEqual(len(camera), self.camera_data.n_detectors)
88 self.assertEqual(next(iter(camera)).getName(), self.camera_data.first_detector_name)
90 def test_plate_scale(self):
91 """Check the plate scale at center of focal plane
93 Check plate_scale using the FOCAL_PLANE to FIELD_ANGLE transform
94 from the camera.
95 """
96 plate_scale = self.camera_data.plate_scale
97 self.assertIsNotNone(plate_scale)
98 camera = self.butler.get("camera", immediate=True)
99 focalPlaneToFieldAngle = camera.getTransformMap().getTransform(FOCAL_PLANE, FIELD_ANGLE)
100 focalPlaneRadiusMm = 0.001 # an offset small enough to be in the linear regime
101 for offsetAngleRad in (0.0, 0.65, 1.3): # direction of offset; a few arbitrary angles
102 cosAng = math.cos(offsetAngleRad)
103 sinAng = math.sin(offsetAngleRad)
104 fieldAngleRadians = focalPlaneToFieldAngle.applyForward(
105 lsst.geom.Point2D(cosAng * focalPlaneRadiusMm, sinAng * focalPlaneRadiusMm)
106 )
107 fieldAngleRadius = math.hypot(*fieldAngleRadians) * lsst.geom.radians
108 measuredScale1 = fieldAngleRadius / focalPlaneRadiusMm
109 self.assertAnglesAlmostEqual(measuredScale1, plate_scale)
111 focalPlanePos = focalPlaneToFieldAngle.applyInverse(
112 lsst.geom.Point2D(
113 fieldAngleRadius.asRadians() * cosAng, fieldAngleRadius.asRadians() * sinAng
114 )
115 )
116 focalPlaneRadiusMm2 = math.hypot(*focalPlanePos)
117 measureScale2 = fieldAngleRadius / focalPlaneRadiusMm2
118 self.assertAnglesAlmostEqual(measureScale2, plate_scale)