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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