🚀 go-pugleaf

In article 1deo6pINNlj9@darkstar.UCSC.EDU, sla@umbra.UCSC.EDU (Steve Allen) writes:
>In article <DWELLS.92Nov5190043@fits.cv.nrao.edu>
>dwells@fits.cv.nrao.edu (Don Wells) writes:
>>Bob Hanisch distributed copies of a paper which he and I prepared in
>>February 1988. This paper documented the conclusions reached during a
>>WCS workshop held in Charlottesville in January 1988; it should be the
>>starting point for a new round of discussions of WCS issues.
>
>In looking over this paper I am left asking a question about the
>CRPIX1 and CRPIX2 values at the point of tangency on the sky.
>
>The question boils down to another question:  Are FITS images representing
>binned data or sampled data?  How do you tell?
>
> etc....

This issue was discussed during the meeting in Boston, and it was agreed
that the proposal has to be revised to indicate the conventions being
used.  The consensus was that for FITS, pixel (1,1) is the pixel in the lower
left-hand corner of an image and that for the purpose of the WCS, this
pixel represents data from 0.5 to 1.5 in pixel coordinates.  This clarification
will be added to the proposal.

---
Robert J. Hanisch                       Tel. (410)338-4910   Fax. (410)338-5090
Space Telescope Science Institute       NSI: hanisch@stsci.edu [130.167.1.2]
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