Plotting concave data

Hello,

I need to plot level 1B data (brightness temperatures) from TRMM/TMI,
and I have had some measure of success using gsn_csm_contour_map.
However, each scan by TRMM is conical, and thus it creates a
non-convex path, like this:

http://sharaku.eorc.jaxa.jp/ADEOS2/JAXA_TYP_DB/TYP_DB_TRMM/201008/07L/2A12.100829.72843.6.07L.EARL.png

However, when I plot this with gsn_csm_contour_map, the concave
portion of the scan (the "U" shape at the back of the swath) is filled
in with interpolated, very poor quality values; I would much rather
just leave those values out. As an example, over land the values
should obviously be around 300 K; with the interpolated values, the
temperature of the ocean and the land are mixed together. Any ideas
about how I can make my plot more like the sharaku link above?

Thank you for your time. Best wishes,

Jeff
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Received on Mon Mar 26 16:12:07 2012