[iaufwg] Call for vote on the new FITS Standard

[Dick Shaw]

While it may be possible to find ways to improve the wording still further in 
the 3.0 draft, IMHO the time for that has come and gone, save for serious 
technical flaws. In any case, the suggested change is not correct in the 
general case: the index in question, j, runs from 1 to WCSAXES.

On Tue, 06 May 2008 18:03:44 -0400
  William Thompson <William.T.Thompson at nasa.gov> wrote:
> 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.
> 
> I suggest the following revised wording, incorporating some of the wording from 
> version 2.1b:
> 
> CRPIXj - [fl oating-point; indexed; default: 0.0]
> Coordinate of the reference point along the pixel axis j.  This value is
> based upon a counter that runs from 1 to NAXISj with an increment of 1 per 
> pixel.  Note that the reference point may lie outside the image.
> 
> One might also want to add the phrase "as is the case for the default value", or 
> something like it, to the last sentence, since 0.0 is just outside the image.
> 
> Bill Thompson
> 
> P.S.  There is an extraneous "the" in the first sentence of section 7.3.4 on the 
> TDISPn keyword.