WCSTools Subroutines

World Coordinate System Subroutines

Subroutines to extract and use sky WCS information in FITS headers. These subroutines and the I/O and access subroutines below are in the wcssubs tar package as well as in the libwcs.a library which comes with the wcstools tar package. They are also used by the image display and browsing programs SAOimage, SAOtng, and skycat for translating between image and sky coordinates. They were originally written for SAOimage to track image pixel sky positions and display external databases in sky coordinates translated from the cursor's position in the displayed image.

Image I/O and Access Subroutines

Subroutines to read FITS and IRAF headers and images and to access images with any datatype.

Source Catalog Access Subroutines

Subroutines to extract stars in a specified region from the HST Guide Star catalog, the USNO J Catalog, or a user-supplied Starbase-format catalog.

Processing Subroutines

Sburoutines used by the various WCSTools tasks, such as source finding and WCS fitting.

Last updated 31 July 2018 by Jessica Mink, SAO Telescope Data Center