[pdal] upsample

[Bradley Chambers]

Good call with GDAL reader/writer, but this only gives you 1 point per
cell. Another partial solution would be to use filters.locate, searching
for the max in the Z dimension (see the docs on how to specify this). You'd
have to split using filters.splitter first, and would have the same issue
in the end of having a single point per cell. I'm just not sure we have a
filter that could take that value and apply it to the rest of the points in
the cell. You could write a Python script and call that with filters.python.

On Fri, Aug 14, 2020 at 4:05 PM Connor Manning <connor at hobu.co> wrote:

> Sounds like you could do this in raster land since you are interested in
> 1x1 meter cells.  Perhaps the GDAL writer (
> https://pdal.io/stages/writers.gdal.html) with a `resolution` of 1 and an
> `output_type` of "max".  And then to reinterpret your output as a point
> cloud: the GDAL reader (https://pdal.io/stages/readers.gdal.html).
>
> On Fri, Aug 14, 2020 at 3:12 PM Alison Cramer <alisoncramer at nevada.unr.edu>
> wrote:
>
>> 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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