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Terrain Flattening should avoid getting elevation for each pixel in iterations
Description
Getting DEM elevation is expensive. Currently there are several places in the code where elevation is get for each pixel repeatedly. This can improved by getting the elevations for all pixels in the tile once and use them in later on processing.
Getting DEM elevation is expensive. Currently there are several places in the code where elevation is get for each pixel repeatedly. This can improved by getting the elevations for all pixels in the tile once and use them in later on processing.