[ncl-talk] Difference plot contour map emply

[Debasish Hazra]

Hi,

 I am using NCL (v6.3) to make a difference plot between two model outputs.
First one (grib2 file) dimension is [lat | 181] x [lon | 360]  and
coordinates are  lat_0: [90..-90], lon_0: [ 0..359].  _FillValue :   1e+20

second one (netcdf) dimension [lat | 180] x [lon | 360] and coordinates are
lat: [-89.5..89.5] , lon: [-179.5..179.5].  _FillValue :   -9999

To make both of them equal dimension before doing differences, I used "linint2"
function to interpolate 2nd one to the dimension of first. However, after
doing simple difference plot between the interpolated one and the first
output, I am getting all constant value and map plot remains empty.
Individual plot of these 2 dataset show lot of differences. Is it because I
did not assign fillvalue after interpolation , or something else ? Any
suggestions.

Thanks
Debasish
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