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Problem in calculation of area in a raster map

Question asked by pbanerjee on Dec 30, 2014
Latest reply on Dec 31, 2014 by pbanerjee

I have used GPS readings and attribute data to create interpolation raster map using IDW method. Usually, GeoTIFF maps have a resolution of 30 m. However, raster map made by me has only 0.0005694 cell size. When I project it using WGS_UTM_45N plane projection system, each polygon (or collection of cells with same value) show much lower area size than they actually are. Help me out plz