Re: [TASS] Non-Linearity of Mk IV Images

[Chris Albertson <chrisja@jps.net>]

Tom Droege wrote:
>
> Ted and all,
>
> This must be a solved problem.  All those astronomers out there already
> have this problem so there must be programs out there that have worked this
> out.  The problme is probably adopting them to our particular situation and
> putting them into our software control system.  ;^)

Tom's right.  I think astronomers have been doing this from
the days of glass plates.  There is a pair of functions in the
CFITSIO library that will convert x,y on a CCD to ra,dec and
the other way around.  The routines handle the polar area,
rotated CCD chips and the projection of a shpere onto a plane.
There are likely many more libraries with this function.


   --Chris Albertson             home: chrisja@jps.net
     Redondo Beach, California   work: calbertson@logicon.com