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TRIGRID problem
- Subject: TRIGRID problem
- From: Cathy Smith <cas(at)cdc.noaa.gov>
- Date: Fri, 05 Jan 2001 11:49:14 -0700
- Newsgroups: comp.lang.idl-pvwave
- Organization: Climate Diagnostics Center
- Xref: news.doit.wisc.edu comp.lang.idl-pvwave:22834
Hi
I ran into a problem using TRIGRID to interpolate an array from 36x16 to 72x16
on a sphere. I have the two lines
triangulate,xlon1,xlat1,tr,FVALUE=slp1,sphere=s,/degrees
z=trigrid(slp1,[0.,0.],[0.,15.,355.,90.],NX=72,NY=16,/degrees,sphere=s)
This did not work and gave me the error
% TRIGRID: Points are co-linear, no solution.
However, using 354.99 instead of 355 gave me the correctly interpolated
grid and no error.
I think I followed the directions correctly (and in fact I tried setting
GS to 5x5 and other similar
permutations but got the same error).
Does anyone know why?
Cathy Smith
NOAA-CIRES CDC.