lastile best practices?

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Theo Hartsook

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Mar 30, 2020, 5:33:45 PM3/30/20
to LAStools - efficient tools for LiDAR processing
Hi all,

I have a best practices question. I am processing some dense TLS scans that need to be tiled for the classification steps. It seems to me that this is a valid time to use the -reversible and -reverse_tiling flags but I was curious since the command line says it's typically used for flight lines.

WARNING: the '-reversible' flag is rarely needed. it is typically only used to go back to an original flight line after classifying

Is there a substantial difference between using it on airborne vs terrestrial scans? If so, what's the preferred way for TLS? I would assume it involves lasmerge but just curious.

George S. Mercier

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Apr 1, 2020, 7:19:52 PM4/1/20
to LAStools - efficient tools for LiDAR processing
I think you would want to use a -buffer X and -flag_as_withheld with LASTILE so later you could use LAS2LAS and -drop_withheld to remove the buffer data around the tiles.

See here for more https://rapidlasso.com/2015/08/07/use-buffers-when-processing-lidar-in-tiles/  Here Martin uses -use_orig_bb option.

-GM

Martin Isenburg

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Jul 11, 2021, 10:09:22 PM7/11/21
to LAStools - efficient command line tools for LIDAR processing
Hello,

The '-reversible' switch in lastile will give each point of every tile an index that stores what exact position they used to have in the one (too large to process without tiling) LAS/LAZ file they came from. This index is then carried through any number of LAStools processing steps on the tiles. This is only needed when at the end of these processing steps the original file (the one that was tiled) is supposed to be recreated with the processed results. This is accomplished by rerunning lastile with one complete set of the processed tiles as input and giving it the '-reverse_tiling' switch. This will then produce one output file with the points in the original order (minus those that might have been deleted during the processing steps on the tile.


You NEVER need the '-reversible' switch if you have no interest in eventually reconstructing the points in their original order into one file at the end of the tiling process. 

Regards,

Martin

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