[gradsusr] Function lterp for scanning/elevation angles to lon/lat (GOES satellites)

[pascal.frerebeau at laposte.net]

‌Hello all,

I am trying to display satellite data with GrADS (file format: NETCDF4). But the X and Y axis are East/West scanning angle and North/South elevation angle, respectively (both vary from 1 to 10848, they are scanned values). GrADS wrongly interprets X and Y data as longitudes and latitudes. I need to plot the data with lon and lat instead of X and Y. I know the (complicated) relation between both grids. I didn’t find any example of how to do that with the lterp function. How can I do that with GrADS? I’ve written a script to read all data and write them in a new file where the coordinates are lon and lat, but its execution is very long (other solution: lost of precision). I thank you for your answers.
 

Yours sincerely,
Pascal Frèrebeau

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