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<div class="moz-cite-prefix">On 05/15/2015 04:40 PM, Adam Laža
wrote:<br>
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<div class="gmail_quote">Hi all,
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<div><font color="#000000">I've got some data
from UAS (SenseFly eBee) exported as point
cloud. I'd like to ask if there's any way
how to classify the data in GRASS. As an
input I have a point cloud exported in .las
or .txt file. As an output I need another
.las file containing only terrain (I need to
filter out objects, buildings and
vegetation) for next step which is
generating DTM.</font></div>
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Using the libLAS utility 'las2las' you can filter out only those
points with classification "ground" (the classification value is 2)
like so:<br>
las2las in.las --output=ground.las --keep-classes 2<br>
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You can find all the point classes in this doc:<br>
<a class="moz-txt-link-freetext" href="http://www.asprs.org/a/society/committees/standards/LAS_1_4_r13.pdf">http://www.asprs.org/a/society/committees/standards/LAS_1_4_r13.pdf</a><br>
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cite="mid:CAOvRMtwFJXYk8Sb=9M2a1g=R7irgoiQsgoFM7LPpf+NTuY++eg@mail.gmail.com"
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<div><font color="#000000">I've already tried
some modules, import(r.in.lidar, v.in.lidar)
works well. Then I focused on v.lidar.*
modules (v.lidar.edgedetection,
v.lidar.growing, v.lidar.correction) but
already the first step of recognizing and
extracting object didn't work for me. I
suppose it's due to the v.lidar.* modules
need data only from LiDAR, but I have data
from phtogrammetry (eBee carries Canon RGB
camera).</font></div>
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<div><font color="#000000">Any idea how to
classify my data?</font></div>
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<div><font color="#000000">Thank in advance,</font></div>
<div><font color="#000000">Adam</font></div>
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<div><font color="#000000">Data sample at google
drive:</font></div>
<div><font color="#000000">las:</font></div>
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<font color="#000000"><a moz-do-not-send="true"
href="https://drive.google.com/file/d/0B3qa8r8b0sq0TTdnSVNHdE1UQ2M/view?usp=sharing"
target="_blank">https://drive.google.com/file/d/0B3qa8r8b0sq0TTdnSVNHdE1UQ2M/view?usp=sharing</a></font>
<div><font color="#000000">txt:<br>
</font>
<div><font color="#000000"><a moz-do-not-send="true"
href="https://drive.google.com/file/d/0B3qa8r8b0sq0NVFRMmNEZHNkbDA/view?usp=sharing"
target="_blank">https://drive.google.com/file/d/0B3qa8r8b0sq0NVFRMmNEZHNkbDA/view?usp=sharing</a></font><br>
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