[pdal] (no subject)

[lefsky at gmail.com]

I wrote the following code to calculate point density. While it produces
results that have the correct spatial pattern, the absolute values appear
to be incorrect. The image is 3938 pixels by 3938 pixels and the mean pixel
value is 32.8, so the total number of points from the PDAL calculation is

3938*3938 * 32.8 = 483403808.8

but there are only 164022975 points in the original laz file, so the
estimate of 483403808.8 is just about 3 times larger than the number of
points in the las (2.947 top be exact)

Or have I misunderstood something?

M

Image Statistics:

[image: image.png]

json:

  "pipeline":[
    {
        "type":"readers.las",
        "filename":"/home/lefsky/time_trials/tile_67_136_sub_2.laz"
    },
    {
        "type":"writers.gdal",
 "filename":"/home/lefsky/time_trials/tile_67_136_sub_2_density.tif",
    "dimension":"Z",
        "data_type":"Float32",
        "output_type":"count",
        "resolution": 1
    }
  ]
}




-- 
Michael Lefsky (He/His)
Home Location: HVHF+GH
Cell: 970-980-9036
http://www.researcherid.com/rid/A-7224-2009

*“for being prematurely, and worse, intuitively right — there’s a heavy
price. But for being wrong — no, not so long as you’re wrong in a pack."
Gary Brecher / Portis*

*I acknowledge that I live and work on stolen land. This is the land of the
Cheyenne, Arapaho, Ute, and Ocheithi Sakowin people. To learn more about
these nations, please visit;
http://www.utemountainutetribe.com/
http://www.cheyennenation.com/
https://cheyenneandarapaho-nsn.gov/
https://native-land.ca/
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