Surface Operations

The surface module contains functions for performing common surface calculations on elevation rasters.

Operations

aspect(raster)	Calculates the aspect of each raster cell for each raster band.
curvature(raster)	Calculates the curvature of each raster cell for each raster band.
easting(raster[, is_aspect])	Calculates the easting component of each raster cell for each band.
hillshade(raster[, azimuth, altitude])	Calculates the hillshade component of each raster cell for each band.
northing(raster[, is_aspect])	Calculates the nothing component of each raster cell for each band.
slope(raster[, degrees])	Calculates the slope (degrees) of each raster cell for each raster band.
surface_area_3d(raster)	Calculates the 3D surface area of each raster cell for each raster band.
tpi(dem, annulus_inner, annulus_outer)	Compute the Topographic Position Index of a DEM.