[fitsbits] CRPIX clarification

[Eric Greisen]

Mark Calabretta wrote:
> On Thu 2008/06/12 14:13:44 -0400, William Pence wrote
> in a message to: FITSBITS <fitsbits at nrao.edu>
> 
>> 1.  Change the first sentence in section 8.1 from
>>
>>   Rather than store world coordinates separately for each datum (e.g. as
>>   is done for random groups data), the regular lattice structure of a
>>   FITS image offers the possibility of defining rules for computing
>>   world coordinates at each point.
>>
>> to
>>
>>   Rather than store world coordinates separately for each datum, one
>>   may define rules for computing world coordinates at each point.
> 
> This change is not acceptable to me.
> 
> The underlying basis of the world coordinate formalism is that the
> data has a regular structure, unlike random groups for example.
> Metrics don't come into it, at least not at this level.
> 
> Regards, Mark
> 
> 
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I did not like the former wording since random groups does have a 
regular lattice with WCS under the same rules as images along with the 
random parameters which need not have rules.

Eric Greisen