In previous versions of CCDPACK a different method was used for registration, which relied only on object matching and stored coordinate mapping information in TRANSFORM (SUN/61) structures in the CCDPACK extension of the images. If you are used to this way of doing things do not despair! In the first place, the object matching methods appear to work just the same as before (i.e. a CCDPACK script which used to perform registration, resampling and combination should still do so), although the routines are now storing coordinate system information in a different way. Furthermore, all the programs retain their ability to read transformation information written as TRANSFORM structures, for backward compatibility with files which have already been partially processed by CCDPACK.
The applications FINDOFF, REGISTER, TRANLIST, and TRANNDF write and (by default) read coordinate system information using coordinate systems attached to images, but retain options which allow them to read the old TRANSFORM structures on request.
All the things which can be done using TRANSFORM structures however can be as well or better done with attached coordinate systems, and the ability of CCDPACK programs to read TRANSFORM structures may be withdrawn altogether in a future release.
CCDPACK