Problem to identify the grid for the study area and extract data from RCM

From: Jaya Pudashine <letterjaya_at_nyahnyahspammersnyahnyah>
Date: Sat Jun 01 2013 - 04:18:45 MDT

Dear All,

I have got RCM data from Cordex with the following attributes

5 Variables : lat, lon, tasmin, time, height

file global attributes:

      Conventions : CF-1.4

      contact : sms416@kongju.ac.kr

      creation_date : '2012-09-15 T02:44:17Z'

      experiment_id : historical

      experiment : Projection run with RCP historical

      driving_experiment : HadGEM2-AO, projection, r1i1p1

      driving_model_id : HadGEM2-AO

      driving_model_ensemble_member : r1i1p1

      driving_experiment_name : projection

      frequency : day

      institution_id : KNU

      institution : Kongju National University, Gongju, South Korea

      model_id : RegCM4

      model : Regional Climate Model, ICTP

      RCM_version_id : v4

      RCM_version : version 4.0

      project_id : CORDEX

dimensions:

      ncl_scalar = 1

      south_north = 195

      west_east = 241

      time = 1800 // unlimited

   variables:

      double lat ( south_north, west_east )

         units : degrees_north

         long_name : latitude coordinate

         standard_name : latitude

         description : Latitude, South is negative

      double lon ( south_north, west_east )

         units : degrees_east

         long_name : longitude coordinate

         standard_name : longitude

         description : Longitude, West is negative

*I have used ncl to plot that RCM on the native grid*

ncl 0> f=addfile("1996_2001.nc","r")

ncl 1> temp=f->tasmin

ncl 2> newtemp=temp(0,:,:)

ncl 3> load "$NCARG_ROOT/lib/ncarg/nclscripts/csm/gsn_code.ncl"

ncl 4> load "$NCARG_ROOT/lib/ncarg/nclscripts/csm/gsn_csm.ncl"

ncl 5> lat=f->lat

ncl 6> lon=f->lon

ncl 7> newtemp@lat2d=lat

ncl 8> newtemp@lon2d=lon

ncl 9> wks=gsn_open_wks("x11","res")

ncl 10> plot=gsn_csm_contour_map(wks,newtemp,False)

I have attached that plot herewith.

*Now my problem is , I need to extract data only for study area. My study
area ranges from 270903 N to 280624 N and 862602E to 86252 E.
This RCM data has a resolution of 5KM. How I can identify those grids only
covering my study area and extract data for only those grids for the whole
period. Please help me in this matter.*

* *

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Received on Sat Jun 1 04:19:01 2013

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