Will filter a grid in the time domain using a boxcar, cosine arch, gaussian, median, or mode filter and computing distances using Cartesian or Spherical geometries. The output can optionally be generated as a sub-region of the input and/or with anew increment.  Inthis way, one may have "extra space" in the input data so that the edges will not be used and the output can bewithinone-half-width of the input edges. If the filter is low-pass, then the output may be less frequently sampled than the input. Note that, contrary to the GMT version where the NaNs eaten by the filtering operation on the borders of the data/no-data, here NaNs are preserved by default. By that it is meant that input and output grids have the NaNs (when they exist of course) in the exact same positions.

Copyright <2010>, <Joaquim Luis>

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