Package astLib :: Module astWCS

Module astWCS

module for handling World Coordinate Systems (WCS)

http://astlib.sourceforge.net

This is a higher level interface to some of the routines in PyWCSTools (distributed with astLib). PyWCSTools is a simple SWIG wrapping of WCSTools by Jessica Mink (http://tdc-www.harvard.edu/software/wcstools/). It is intended is to make this interface complete enough such that direct use of PyWCSTools is unnecessary.

Classes

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WCS
This class provides methods for accessing information from the World Coordinate System (WCS) contained in the header of a FITS image.

Functions

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dictionary

findWCSOverlap(wcs1, wcs2)
Finds the minimum, maximum WCS coords that overlap between wcs1 and wcs2.

source code

Variables

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bool NUMPY_MODE = True
If True (default), pixel coordinates accepted/returned by routines such as astWCS.WCS.pix2wcs, astWCS.WCS.wcs2pix have (0, 0) as the origin.

lconv = locale.localeconv()

Function Details

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findWCSOverlap(wcs1, wcs2)

source code

Finds the minimum, maximum WCS coords that overlap between wcs1 and wcs2. Returns these coordinates, plus the corresponding pixel coordinates for each wcs. Useful for clipping overlapping region between two images.

Returns: dictionary: dictionary with keys 'overlapWCS' (min, max RA, dec of overlap between wcs1, wcs2) 'wcs1Pix', 'wcs2Pix' (pixel coords in each input WCS that correspond to 'overlapWCS' coords)

Variables Details

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NUMPY_MODE

If True (default), pixel coordinates accepted/returned by routines such as astWCS.WCS.pix2wcs, astWCS.WCS.wcs2pix have (0, 0) as the origin. Set to False to make these routines accept/return pixel coords with (1, 1) as the origin (i.e. to match the FITS convention, default behaviour prior to astLib version 0.3.0).

Type:: bool

Value:

True