[pdal] upsample

[Alison Cramer]

I have a point cloud of an abandoned mine land with a waste rock pile.  The
waste rock pile has rills (soil removed by erosion) caused by large
rainfall events.  This causes differences in elevation (z values) within 1
square meter.  I would like to perform a moving window of 1m along the
waste rock pile.  This would hopefully give me "cells" of 1m by 1m.  My
goal is to find the maximum z value in every 1m cell.  Once I find the max
z value in each 1m cell, I would like to replace the current z values with
the specific maximum z value calculated for each cell.  Then export to a
new point cloud.  Does anyone have an idea as to how I would go about this
in pdal?
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