As of version 260716, formula support has been implemented in LAStools. It is now possible to filter input files using wildcards and formulas, or to filter / transform individual points during processing. Formulas enable significantly more complex operations than were previously possible with standard filter or transformation arguments.
Formulas can be specified directly via the command line for all tools. Formulas for file filtering are defined using the „-fileformula“ argument:
las2las64 -i *.laz -odir out -olaz -fileformula "keep=hdrPcnt>1000000"copies all files containing more than 1 million points to the output directory.
Formulas for point processing can be applied directly via transformation or filter functions:
lasgrid64 -i in.laz -o out.png -formula "keep=z>280.0;i=i*u"creates a raster file for all input pixels with a Z-value greater than 280, multiplying the intensity value by the value from the user byte.
Further information, additional examples, and the formula module reference can be found in the corresponding README file.