[iaufwg] Call for vote on the new FITS Standard

[Steve Allen]

On Tue 2008-05-06T18:03:44 -0400, William Thompson hath writ:

> I have done a final reading of the draft FITS standard preparatory to voting on
> it.  I am ready to vote in favor of this draft, except for one small omission
> having to do with the definition of the keyword CRPIXj.  Nowhere does it state
> that CRPIXj runs from 1 to N, instead of from 0 to N-1.  I've found that the
> distinction between these two cases trips up many novice FITS users, and is the
> most common mistake made.

Ah, this was covered in the text of WCS 1 in section 2.1.4 in the
first paragraph, but the string CRPIX does not occur anywhere near
that paragraph.

Following that paragraph it may be prudent also to echo that an integer
value of CRPIXja refers to the center of a given pixel (in cases where
the model for pixel coordinates admits pixels with extent).

--
Steve Allen                 <sla at ucolick.org>                WGS-84 (GPS)
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