hi, the las2las version from LAStools [*] can do both Q1 and Q2.
for Q1 you can set a gps-time of 0.0 for each point with las2las -i lasformat0.las -o lasformat1.las -point_type 1 or for LAS points with RGB values las2las -i lasformat2.las -o lasformat3.las -point_type 3 for Q2 you can invert the height with las2las -i lidar.las -o lidar_inverted.las -scale_z -1.0 cheers, martin @lastools [*] http://www.cs.unc.edu/~isenburg/lastools On Wed, Jun 15, 2011 at 6:18 AM, Howard Butler <[email protected]> wrote: > On Jun 15, 2011, at 4:33 AM, Julian Olszewski wrote: > > > Sorry for asking two questions within the same thread. > > No problem. > > > Q1: Is there any way to populate a las file with "fake" GPS Time. > > Not with libLAS at this time. las2las can only do translation on XYZ > values at this point. You could do it yourself using the Python bindings > and a little bit of scripting (it would be much slower, of course). > > > The software I use require GPS Time - it's mandatory otherwise I won't be > able to load the data > > Which software is this? It would seem that it could do the faking itself > if it didn't find time values. > > > Q2: Can I invert the height or multiply by -1? > > See above. > > _______________________________________________ > Liblas-devel mailing list > [email protected] > http://lists.osgeo.org/mailman/listinfo/liblas-devel >
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