[AstroPy] General method to compute pixel solid angle for any WCS projection?

Christoph Deil Christoph.Deil at mpi-hd.mpg.de
Thu Dec 5 09:07:10 EST 2013


does anyone know a good general method to compute pixel solid angles for arbitrary WCS FITS maps?

I know there is HEALPIX and for some WCS projections there are analytical formulae for pixel area, but I was wondering if there is a standard robust method to implement it for any WCS.

I did find methods to compute the area of polygons on the sphere:
Would representing each pixel as a 4-corner polygon (or subdividing the pixel sides into parts if the pixels are large and precision is needed) and using that method be the best option?


More information about the AstroPy mailing list