Calculates the area root mean square slope of a raster or matrix surface using the seven-point method.
A raster or matrix.
A numeric value representing the seven-point root mean square slope, Sdq6. The units of the returned value are change in z per one unit (pixel).
This function is based on the equations found at https://www.ntmdt-si.ru/data/media/files/manuals/image_analisys_p9_nov12.e.pdf.
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