lsst.obs.base.camera_tests.CameraTests Class Reference

Inheritance diagram for lsst.obs.base.camera_tests.CameraTests:

Public Member Functions
def	setUp_camera (self, camera_name=None, n_detectors=None, first_detector_name=None, plate_scale=None)
def	test_iterable (self)
def	test_camera_butler (self)
def	test_plate_scale (self)

Public Attributes
	camera_data

Detailed Description

Tests that the butler returns a useable Camera.

In the subclasses's setUp():
    * Call setUp_camera() to fill in required parameters.

Definition at line 32 of file camera_tests.py.

Member Function Documentation

setUp_camera()

def lsst.obs.base.camera_tests.CameraTests.setUp_camera	(		self,
			camera_name = None,
			n_detectors = None,
			first_detector_name = None,
			plate_scale = None
	)

Set up the necessary variables for camera tests.

Parameters
----------

camera_name : `str`
    name of this camera
n_detectors : `int`
    number of detectors in this camera
first_detector_name : `str`
    name of the first detector in this camera
plate_scale : `lsst.geom.Angle`
    plate scale at center of focal plane, as angle-on-sky/mm

Definition at line 39 of file camera_tests.py.

                     ):
        """Set up the necessary variables for camera tests.
 
        Parameters
        ----------
 
        camera_name : `str`
            name of this camera
        n_detectors : `int`
            number of detectors in this camera
        first_detector_name : `str`
            name of the first detector in this camera
        plate_scale : `lsst.geom.Angle`
            plate scale at center of focal plane, as angle-on-sky/mm
        """
        fields = ['camera_name',
                  'n_detectors',
                  'first_detector_name',
                  'plate_scale',
                  ]
        CameraData = collections.namedtuple("CameraData", fields)
        self.camera_data = CameraData(camera_name=camera_name,
                                      n_detectors=n_detectors,
                                      first_detector_name=first_detector_name,
                                      plate_scale=plate_scale,
                                      )
 

test_camera_butler()

def lsst.obs.base.camera_tests.CameraTests.test_camera_butler

(

self

)

Check that the butler returns the right type of camera.

Definition at line 80 of file camera_tests.py.

    def test_camera_butler(self):
        """Check that the butler returns the right type of camera."""
        camera = self.butler.get('camera', immediate=True)
        self.assertEqual(camera.getName(), self.camera_data.camera_name)
        self.assertEqual(len(camera), self.camera_data.n_detectors)
        self.assertEqual(next(iter(camera)).getName(), self.camera_data.first_detector_name)
 

test_iterable()

def lsst.obs.base.camera_tests.CameraTests.test_iterable

(

self

)

Simplest camera test: can we get a Camera instance, and does
iterating return Detectors?

Definition at line 71 of file camera_tests.py.

    def test_iterable(self):
        """Simplest camera test: can we get a Camera instance, and does
        iterating return Detectors?"""
        camera = self.butler.get('camera', immediate=True)
        self.assertIsInstance(camera, lsst.afw.cameraGeom.Camera)
        for detector in camera:
            msg = "Failed for detector={}".format(detector)
            self.assertIsInstance(detector, lsst.afw.cameraGeom.Detector, msg=msg)
 

test_plate_scale()

def lsst.obs.base.camera_tests.CameraTests.test_plate_scale

(

self

)

Check the plate scale at center of focal plane

Check plate_scale using the FOCAL_PLANE to FIELD_ANGLE transform
from the camera.

Definition at line 87 of file camera_tests.py.

    def test_plate_scale(self):
        """Check the plate scale at center of focal plane
 
        Check plate_scale using the FOCAL_PLANE to FIELD_ANGLE transform
        from the camera.
        """
        plate_scale = self.camera_data.plate_scale
        self.assertIsNotNone(plate_scale)
        camera = self.butler.get('camera', immediate=True)
        focalPlaneToFieldAngle = camera.getTransformMap().getTransform(FOCAL_PLANE, FIELD_ANGLE)
        focalPlaneRadiusMm = 0.001  # an offset small enough to be in the linear regime
        for offsetAngleRad in (0.0, 0.65, 1.3):  # direction of offset; a few arbitrary angles
            cosAng = math.cos(offsetAngleRad)
            sinAng = math.sin(offsetAngleRad)
            fieldAngleRadians = focalPlaneToFieldAngle.applyForward(
                lsst.geom.Point2D(cosAng * focalPlaneRadiusMm, sinAng * focalPlaneRadiusMm))
            fieldAngleRadius = math.hypot(*fieldAngleRadians) * lsst.geom.radians
            measuredScale1 = fieldAngleRadius / focalPlaneRadiusMm
            self.assertAnglesAlmostEqual(measuredScale1, plate_scale)
 
            focalPlanePos = focalPlaneToFieldAngle.applyInverse(
                lsst.geom.Point2D(fieldAngleRadius.asRadians() * cosAng,
                                  fieldAngleRadius.asRadians() * sinAng))
            focalPlaneRadiusMm2 = math.hypot(*focalPlanePos)
            measureScale2 = fieldAngleRadius / focalPlaneRadiusMm2
            self.assertAnglesAlmostEqual(measureScale2, plate_scale)

Member Data Documentation

camera_data

lsst.obs.base.camera_tests.CameraTests.camera_data

Definition at line 65 of file camera_tests.py.

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The documentation for this class was generated from the following file:

• /j/snowflake/release/lsstsw/stack/0.2.1/Linux64/obs_base/21.0.0-27-gbbd0d29+ae871e0f33/python/lsst/obs/base/camera_tests.py