[gradsusr] curvilinear data

[Jennifer Adams]

It is possible to use PDEF to map curvilinear coordinates to a regular  
lat/lon grid, but I have never tried, and I know of nobody who has  
already done this with GrADS. It requires some knowledge of how to  
convert any lat/lon value into real-valued i,j coordinates in the  
curvilinear grid. It has always been easier to do this interpolation  
outside of GrADS.
--Jennifer


On Mar 18, 2011, at 2:00 PM, James T. Potemra wrote:

> As far as I know, GrADS will only be able to handle curvilinear grids
> that are curvilinear in one dimension, i.e., lat(i)/lon(i), not
> lat(i,j)/lon(i,j). Of course you can always make the control file
> whatever you want, but the display will not be correct.
>
> Jim
>
> Edward wrote:
>>
>> hi, gradsuser,
>>
>> Does anybody has an idea to deal with the curvilinear data in grads?
>> Do I need list all long/lat in ctl file? or  interpolate outside  
>> grads
>> before grads?
>>
>> Thanks for any help.
>>
>>
>> Dawn
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--
Jennifer M. Adams
IGES/COLA
4041 Powder Mill Road, Suite 302
Calverton, MD 20705
jma at cola.iges.org



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