My tests have demonstrated that this does not work as well as clipping for this type of problem. Several passes of the BLACKART low pass filter algorithm improved the data but did not completely remove all the negative elevations.
A typical use of neighborhood statistics is known as "filtering." A "low pass" filter is nothing more than a 3 by 3 cell focal mean performed for an entire grid. Low pass filters smooth out anomalies and peaks in surfaces.
that the voxel data is sampling a suitably band-limited signal, accurate reconstructions of data points in between the sampled voxels can be attained by low-pass filtering the data set. Visually acceptable approximations to this low pass filter can ...
 See also: Analysis, Origin, Image, Feature, Resolution
  
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