Calculates the surface area of a flat raster or matrix with the same x, y bounds as the study surface.
A raster or matrix.
This function scales both x and y to between 0 and 1. This is done because most satellite data have units where the x, y units do not equal the z units and because the flat surface area is usually compared to the actual surface area. Surface area is calculated over the sample area (N-1, M-1).
A numeric value representing the scaled surface area of a flattened surface with the same x, y bounds.
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