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Search: Posts made by: David Berry
Forum: FITS May 6th 09, 07:54 AM Posted to sci.astro.fits
Replies: 9
Views: 1,021
Posted By David Berry
[fitsbits] frequency definitions

It looks like Tom's query was about dual sideband data, which is not
covered by paper III. OBSFREQ, etc, are not in the standard. There are
probably various different schemes in use out there. For...
Forum: FITS October 13th 08, 08:16 AM Posted to sci.astro.fits
Replies: 1
Views: 958
Posted By David Berry
[fitsbits] WCSLIB issue with PV values,SCAMP projection parameters.

The problem here is that the first four parameters on the longitude
axis are reserved for the native longitude and latitude of the
projection's fiducial point, and for copies of LONPOLE and...
Forum: FITS September 20th 07, 03:39 PM Posted to sci.astro.fits
Replies: 0
Views: 447
Posted By David Berry
[fitsbits] CDELTn

On 20/09/2007, Francois Ochsenbein wrote:

Sorry Mark, but my question was NOT related to WCS...

But the value of the expression

CRVAL + CDELT*( i - CRPIX)

is...
Forum: FITS September 18th 07, 12:26 PM Posted to sci.astro.fits
Replies: 1
Views: 488
Posted By David Berry
[fitsbits] CDELTn

Section 2.1.2 of FITS-WCS paper 1 says "Furthermore, all CDELTi must
be non-zero." Even if NAXISn is 1, that one pixel should still have
some width. If any CDELT is zero then the transformation from...
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