View Single Post
  #6  
Old September 23rd 08, 03:51 PM posted to sci.astro.fits
Boud Roukema
external usenet poster
 
Posts: 3
Default [fitsbits] Start of the FITS Region File Public Comment Period

hi fitsbits,

On Mon, 8 Sep 2008, LC's NoSpam Newsreading account wrote:

5) definition of polygon

seems unclear. I presume m cannot be 3 (should be said)


Digons (two-sided polygons) with a positive area exist on the 2-sphere
(and dihedrons exist on the 3-sphere). However, the proposal seems to deal
with the pixel space in the tangent plane, so m = 3 would be a
reasonable constraint to reduce the chance of accidental programming
errors.

http://en.wikipedia.org/wiki/Digon

cheers
boud