On Jun 25, 2013, at 10:09 PM, dyjbean wrote:
> hi,
>
> i have a global 2D data (lat*lon), and over sea and on land have the same _FillValue, i only want to interpolate those missing gap in land, how can i do it?
> first mask out the sea, later interpolate with some functions ?
> i appreciate your suggestion.
> thanks
> dyjbean
Your suggested method sounds good.
Do you have any kind of land/sea mask variable already on your file? If so, then you can use the NCL "mask" function to mask your data based on this array. See example "mask_1.ncl" at:
http://www.ncl.ucar.edu/Applications/mask.shtml
If you don't have a land/sea mask variable on your file, then you can try the "landsea_mask" function, which uses a 1 degree mask. See example "mask_5.ncl" on the same page.
If you have really high resolution data, then you may need to find a shapefile that has a better resolution than 1 degree, and create your own mask from this. See example mask_13.ncl
--Mary
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Received on Wed Jun 26 08:42:32 2013
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