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TRIGRID problem [message #23084]

Fri, 05 January 2001 10:49

Cathy Smith
Messages: 3
Registered: January 2001

Junior Member

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,/degree s,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.

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