[GIS] Using LAStools in QGIS gives “global name ‘os’ is not defined”

Question

I have a problem with LAStools in QGIS 2.6.1. I have never used QGIS to process LiDAR data before.

I downloaded LAStools yesterday from the rapidlasso GmbH website. I unzipped the “lastools.zip” file into my osgeo folder (C:\OSGeo4W64\LAStools) and followed the instructions for activating LAStools and specifying the folder location. LAStools appears correctly in my Processing Toolbox in QGIS.

Then, I downloaded a LiDAR tile from the National Land Survey of Finland as a .laz file. I tried to use lasground to view this data, and followed the instructions on the rapidlasso GmbH website (see screengrab). However, I get this message in my log:

Algorithm lasground starting…global name 'os' is not defined See log for more details

Am I missing some dependency from my library?

Answer 1

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My problem was that there was a space in the path to the .las file I was using.