bugGNU Astronomy Utilities - Bugs: bug #64617, gal_polygon_area_sky not fully on...


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bug #64617: gal_polygon_area_sky not fully on spherical coordinates

Submitter:  Mohammad Akhlaghi <makhlaghi>
Submitted:  Sat 02 Sep 2023 10:20:38 PM UTC
Category:  Libraries Severity:  3 - Normal
Item Group:  Output not reasonable Status:  Postponed
Privacy:  Public Assigned to:  None
Open/Closed:  Open

Sat 02 Sep 2023 10:20:38 PM UTC, original submission:  

As of Gnuastro 0.20.66, the 'gal_polygon_area_sky' function just applies a relatively basic correction to the method used in 'gal_polygon_area_flat' (for a euclidean coordinate system).

However, as described in the Area and spherical excess section of the Wikipedia page for spherical trigonometry, there is an analytic solution to this problem that we should implement in 'gal_polygon_area_sky'.

Mohammad Akhlaghi <makhlaghi>
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