[ncl-talk] Difference plot contour map emply

[Mary Haley]

Debasish,

Without seeing your code, we have no way of helping you debug it.

I recommend using print statements to verify that your data after
interpolation is correct. If your interpolated data array is called
(data_interp):

printVarSummary(data_interp)
printMinMax(data_interp,0)
print(num(ismissing(data_interp)))    ; count the number of missing values

If you continue to have problems, it would help if we could see a plot or
some code.

--Mary


On Mon, Apr 11, 2016 at 6:57 AM, Debasish Hazra <debasish.hazra5 at gmail.com>
wrote:

> 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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