[ncl-talk] mask_data

[Mary Haley]

Hi Kunal,

We have some shapefile masking examples that I believe would do exactly
what you want.

Since you are talking about two different regions with potentially two
different shapefiles, however, I decided to create an example for you.

I used shapefiles downloaded from "gadm.org".  I selected the "country"
option, and then downloaded shapefiles for India and Nepal.  I was then
able to use the "shapefile_mask_data" function that's mentioned on our
shapefiles page:

http://www.ncl.ucar.edu/Applications/shapefiles.shtml

See shapefiles_19.ncl, among others.

I'm not sure how much of Northern India you wanted to include, but you can
easily change modify the region you want on this line:

  opt at shape_names = (/"Uttar Pradesh","Himachal Pradesh","Uttaranchal",
"Punjab","Haryana"/)

I wasn't able to reproduce the plot you had exactly, but hopefully you can
modify the script for your purposes.


--Mary





On Thu, May 26, 2016 at 10:43 AM, Kunal Bali <kunal.bali9 at gmail.com> wrote:

> Dear NCL
>
> please, see the attached two figures (1,2). Figure 1 shows the high values
> in Nepal and in the neighbor region i.e. Uttrakhand (Indian region). I need
> to highlight the only Nepal and Uttrakhand region in figure 2 like figure
> 1. I need to mask the data.
>
> May be this can happen with polyline or shapefile ? but i don't know how
> to do it and also i need to extract the data of the selected mask data.
>
>
> Hope you have understand my point.
>
>
> Kunal
>
>
>
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