polygon error

Dear all,

I want to display a Voronoi diagram on the sphere, and each cell has a value. So I need to plot a lot of filled polygons. But I observed that some polygons have been wrongly filled, that is the entire map has been filled except the polygons! I searched out the mail list, and found some one has already encountered such problem:

http://www.ncl.ucar.edu/Support/talk_archives/2009/0109.html,

and "Mary Haley" said "This problem has been fixed and will be in the 5.1.0 release. It had
to do with floating point precision in some low-level map code." But I am using 5.2.1, why such a problem still exist? The following are an example of problematic polygon:

-127.338600 -87.929138
-146.644073 -86.213120
179.307693 -85.080284
144.447769 -85.944191
112.320877 -87.895256
-127.338600 -87.929138

Thanks for help!

DONG Li

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Received on Sun Nov 14 07:57:11 2010