mask area outside a shapefile
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I am trying to mask data (lon,lat,data) outside a shape file, 'shp1'. I used top use arcgis for masking data but would prefer matlab for these actions.
the code below is non responsive
dx=d(:,:,1); %%%%d is a 80x80 data lat=(0:0.5:39.5)'; %%%%lat of the data lon=(60:0.5:99.5); %%%%lon of the data % lony=lony'; laty=repmat(lat,1,80); lony=repmat(lon,80,1); %%%%80x80 lon of the data laty=flipud(laty); %%%%80x80 lat of the data
%%%read shapefile shp1=shaperead('C:\shpfiles\IND_adm0.shp'); lon1 = [shp1.X]'; lat1 = [shp1.Y]'; %%%mask try rx = shp1.X(1:end-1); ry = shp1.Y(1:end-1); mask=inpolygon(lon1,lat1,rx,ry); contourf(lon1,lat1,dx);
1 Comment
Vijay Sagar
on 24 Mar 2023
Edited: Vijay Sagar
on 24 Mar 2023
Your code is correct. Just replace in the last line lon1 and lat1 with lony and laty respectevely. Or you can use insidepoly or maskregion function.
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