Image World Coordinate Setting Program

imwua2 is an alias for imwcs, a program which sets the world coordinate system (WCS) of a FITS or IRAF image. The WCS is the relationship between sky coordinates and image pixels and can be described in a standard way in the header of an image. The program was originally written at the University of Iowa, but has been adapted and amplified by Doug Mink at the Smithsonian Astrophysical Observatory.

imwua2 uses the US Naval Observatory A2.0 catalog, which contains 526,280,881 stars, which should provide a good number of reference stars for any image.

As of version 2.8.7, a set of image stars may be hand-matched to sky positions and used to get a WCS or set initial values for a reference catalog-based WCS (See example 6).

Command Line Arguments


Using SExtractor to find stars in an image

Find image WCS using USNO-A2.0 Stars as references

Find image WCS using pre-matched stars and USNO-A2.0 Stars

Last updated 11 January 2001 by Doug Mink

Telescope Data Center [WCSTools Programs]