## Topic: surface

r.contour | Produces a vector map of specified contours from a raster map.
r.fill.stats | Rapidly fills 'no data' cells (NULLs) of a raster map with interpolated values (IDW).
r.fillnulls | Fills no-data areas in raster maps using spline interpolation.
r.random.surface | Generates random surface(s) with spatial dependence.
r.resamp.bspline | Performs bilinear or bicubic spline interpolation with Tykhonov regularization.
r.surf.area | Prints estimation of surface area for raster map.
r.surf.contour | Generates surface raster map from rasterized contours.
r.surf.fractal | Creates a fractal surface of a given fractal dimension.
r.surf.gauss | Generates a raster map using gaussian random number generator.
r.surf.idw | Provides surface interpolation from raster point data by Inverse Distance Squared Weighting.
r.surf.random | Produces a raster surface map of uniform random deviates with defined range.
v.surf.bspline | Performs bicubic or bilinear spline interpolation with Tykhonov regularization.
v.surf.idw | Provides surface interpolation from vector point data by Inverse Distance Squared Weighting.
v.surf.rst | Performs surface interpolation from vector points map by splines.

See also the corresponding keyword surface for additional references.

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