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to a 2D plane by interpolating the great circle arcs through a Lambert azimuthal equal area projection. Then a standard 2D polygon area method is used.
Make sure the polygons always go clockwise to aid in area computation.
Fix union calculation -- it should be removing interior edges, not interior nodes.
Fix some numerical out-of-range problems in great_circle_arc.py
Remove the serial method for multi_union -- it no longer generates polygons that are compatible with calculating the area.
Make debugging images more explanatory by putting a meaningful title at the top.
git-svn-id: http://svn.stsci.edu/svn/ssb/stsci_python/stsci_python/branches/sphere@17200 fe389314-cf27-0410-b35b-8c050e845b92
Former-commit-id: fb841a481025150f631be6d64cf995dda592ecbc
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