[ncl-talk] Average values over a specified region

[Karin Meier-Fleischer]

Hi Krishna,

you can use the function *closest_val* to retrieve an index of an value.

   lat13  =  closest_val(13,lat)
   lon80  =  closest_val(80,lon)

   print("Index: "+lat13+" -  "+lat(lat13))
   print("Index: "+lon80+" -  "+lon(lon80))

To plot 2 more grid boxes of lat/lon than you can use e.g.

   plot = gsn_csm_contour_map(wks, var(lat13-2:lat13+2,lon80-2:lon80+2),res)


Bye,
Karin

Am 26.01.16 um 14:13 schrieb Krishna C:
> Hi
>
>
> Let us say i need a 2 by 2 box around 13 degree lat and 80 degree lon 
> . How do i know the respective indices.
> Please correct if i am wrong.
>
> Regards
> -Krishna-
>
> On Tue, Jan 26, 2016 at 5:14 PM, Guido Cioni <guidocioni at gmail.com 
> <mailto:guidocioni at gmail.com>> wrote:
>
>     Yes there is, but you should have a look at the documentation on
>     the page ;-)
>     The function that you need is dim_avg_n, then you just need to
>     restrict the latitude and longitude with brackets {43:45}. Again,
>     just go on ncl documentation and you'll definitely find a way
>
>     Il 26 gen 2016 11:52 AM, "Krishna C" <chandrakrishna.90 at gmail.com
>     <mailto:chandrakrishna.90 at gmail.com>> ha scritto:
>
>         Hi,
>
>
>         I am trying to extract precipitation values from WRF output,
>         over a small 2 by 2 lat  lon box and average it. Is there any
>         explicit way of doing it in ncl
>
>         With warm regards
>
>
>         -Krishna-
>
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