This package provides support for WCS based distortion models and coordinate transformation. It relies on PyWCS (based on WCSLIB). It consists of two subpackages: UPDATEWCS and WCSUTIL. UPDATEWCS performs corrections to the basic WCS and includes other distortion infomation in the science files as header keywords or file extensions. WCSUTIL provides an HSTWCS object which extends pywcs.WCS object and provides HST instrument specific information as well as methods for coordinate tarnsformaiton. WCSUTIL also provides functions for manipulating alternate WCS descriptions in the headers.
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