Wolfram Language Paclet Repository
Community-contributed installable additions to the Wolfram Language
MalcolmWoodruff`LineTerra`
LTLoadLAZTerrain  |
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Only points classified as ground, class 2, are used to build the terrain.
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The Wolfram Language has no native LAZ decompressor. A .laz file is decompressed by an external decoder -- PDAL, recommended, or the LASzip command-line tool -- and the resulting LAS file is then read natively. An uncompressed .las file needs no external tool at all.
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Install PDAL with "brew install pdal", or "conda install -c conda-forge pdal". A GUI-launched front end does not inherit an activated conda environment's PATH, so with a conda install set $ltLAZDecoderPath to the decoder's full path -- find it with "which pdal" in an activated terminal.
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This external decoder is the only dependency LineTerra has outside the Wolfram Language.
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Once the terrain is gridded, every downstream step -- alignment, profile, templates, sections, earthwork, baking and export -- is identical to the GeoTIFF workflow. The terrain source changes only how the ground itself is obtained.
Examples
(1)
Basic Examples
(1)
Grid a compressed LIDAR tile, keeping at most a million raw points:
In[1]:=
terrain=
["survey.laz","MaxPoints"1000000]
 | LTLoadLAZTerrain |
Grid an uncompressed LAS file at 2 m spacing, with no external decoder needed:
In[2]:=
terrain=
["survey.las","GridSpacing"2]
| LTLoadLAZTerrain |
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