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LSST Data Management Base Package
|
Functions | |
getSipMatrixFromMetadata (metadata, name) | |
computePixelToDistortedPixel (pixelToFocalPlane, focalPlaneToFieldAngle) | |
lsst.afw.geom.wcsUtils.computePixelToDistortedPixel | ( | pixelToFocalPlane, | |
focalPlaneToFieldAngle ) |
Compute the transform ``pixelToDistortedPixel``, which applies optical distortion specified by ``focalPlaneToFieldAngle``. The resulting transform is designed to be used to convert a pure TAN WCS to a WCS that includes a model for optical distortion. In detail, the initial WCS will contain these frames and transforms:: PIXELS frame -> pixelToIwc -> IWC frame -> gridToIwc -> SkyFrame To produce the WCS with distortion, replace ``pixelToIwc`` with:: pixelToDistortedPixel -> pixelToIwc Parameters ---------- pixelToFocalPlane : `lsst.afw.geom.TransformPoint2ToPoint2` Transform parent pixel coordinates to focal plane coordinates focalPlaneToFieldAngle : `lsst.afw.geom.TransformPoint2ToPoint2` Transform focal plane coordinates to field angle coordinates Returns ------- pixelToDistortedPixel : `lsst.afw.geom.TransformPoint2ToPoint2` A transform that applies the effect of the optical distortion model.
Definition at line 65 of file wcsUtils.py.
lsst.afw.geom.wcsUtils.getSipMatrixFromMetadata | ( | metadata, | |
name ) |
Extract a SIP matrix from FITS TAN-SIP WCS metadata. Omitted coefficients are set to 0 and all coefficients may be omitted. Parameters ---------- metadata : `lsst.daf.base.PropertySet` FITS metadata. name : `str` Name of TAN-SIP matrix (``"A"``, ``"B"``, ``"Ap"``, or ``"Bp"``). Returns ------- `numpy.array` The SIP matrix. Raises ------ TypeError If the order keyword ``<name>_ORDER`` (e.g. ``AP_ORDER``) is not found, the value of the order keyword cannot be read as an integer, the value of the order keyword is negative, or if a matrix parameter (e.g. ``AP_5_0``) cannot be read as a float.
Definition at line 34 of file wcsUtils.py.