hi,<br><br><div class="gmail_quote">the las2las version from LAStools [*] can do both Q1 and Q2.<br><br>for Q1 you can set a gps-time of 0.0 for each point with<br><br>las2las -i lasformat0.las -o lasformat1.las -point_type 1<br>
<br>or for LAS points with RGB values<br><br>las2las -i lasformat2.las -o lasformat3.las -point_type 3<br><br>for Q2 you can invert the height with<br><br>las2las -i lidar.las -o lidar_inverted.las -scale_z -1.0<br><br>
cheers,<br><br>martin @lastools<br><br>[*] <a href="http://www.cs.unc.edu/%7Eisenburg/lastools" target="_blank">http://www.cs.unc.edu/~isenburg/lastools</a><br><br>On Wed, Jun 15, 2011 at 6:18 AM, Howard Butler <span dir="ltr"><<a href="mailto:hobu.inc@gmail.com">hobu.inc@gmail.com</a>></span> wrote:<br>
<blockquote class="gmail_quote" style="margin: 0pt 0pt 0pt 0.8ex; border-left: 1px solid rgb(204, 204, 204); padding-left: 1ex;"><div class="im">On Jun 15, 2011, at 4:33 AM, Julian Olszewski wrote:<br>
<br>
> Sorry for asking two questions within the same thread.<br>
<br>
</div>No problem.<br>
<div class="im"><br>
> Q1: Is there any way to populate a las file with "fake" GPS Time.<br>
<br>
</div>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).<br>
<div class="im"><br>
> The software I use require GPS Time - it's mandatory otherwise I won't be able to load the data<br>
<br>
</div>Which software is this? It would seem that it could do the faking itself if it didn't find time values.<br>
<div class="im"><br>
> Q2: Can I invert the height or multiply by -1?<br>
<br>
</div>See above.<br>
<div><div></div><div class="h5"><br>
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