B = changem(A,new)
replaces all occurrences of 0 in array A with the
specified scalar new. This function is useful for replacing values in
classification grids.
B = changem(A,new,old)
replaces all occurrences of old with new.
Read a land cover classification of Oahu, Hawaii as an array, a map cells reference object, and a colormap. The elements of the array index into the colormap.
[A,R,cmap] = readgeoraster("oahu_landcover.img");
Deciduous forest, evergreen forest, and mixed forest are indicated by the values 9, 10, and 11 in the array, respectively. Create an array that uses the same color for all forests by replacing occurrences of 9 and 10 with 11.
new = [11 11];
old = [9 10];
B = changem(A,new,old);
Display the old and new land cover classifications.
figure
mapshow(A,cmap,R)
title("Land Cover Classification with Three Forest Types")
figure
mapshow(B,cmap,R)
title("Land Cover Classification with One Forest Type")
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