[ncl-talk] speeding up shapefile masking

[Dennis Shea]

[1]  shapefile_mask_data.ncl uses gc_inout which can be slow.

[2] You should create a (say) netCDF file which contains a masked variable.
     This should be saved and used in all subsequent applications.
     *This need be done only once.*

[3] Then use this variable (read from netCDF file) and then use NCL's mask
function
      on all subsequent applications.

      https://www.ncl.ucar.edu/Document/Functions/Built-in/mask.shtml

Reply only to ncl-talk. No personal salutation.

On Tue, Oct 14, 2014 at 3:03 PM, Tabish Ansari <tabishumaransari at gmail.com>
wrote:

> Hi
>
> I have a script wherein I read-in some data from an ascii file and then
> mask it on the basis of a shapefile by calling the script
> "shapefile_mask_data.ncl" within my script. My data has approximately
> 530x980 data points.
>
> Currently it takes around 2 hrs 10 minutes to finish the job. I have to
> repeat this process several times. In future I may have to even do this
> masking within a loop, which will make it impractical due to its
> inefficiency.
>
> Is there a way to speed up this process?
>
> Thanks in advance!
>
>
> Tabish U Ansari
> MS Research Scholar
> Environmental & Water Resources Engineering Division
> Department of Civil Engineering
> IIT Madras
>
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