International Archives of the Photogrammetry, Remote Sensing and Spatial Information Sciences, Vol XXXV, Part B3. Istanbul 2004
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Figure 9. Airborne lidar example (a) point cloud (b) results after
split (c) results after merge (d) classify by area (e) classify by
Gradient (f) classify by average intensity
Computation time for split process 25.48 sec.
Computation time for merge process 403.132 sec
Number of the total octree layers 9
Number of the total leave nodes 42090
Extracted planes and 96 of the total points
30013, 96.7%
used
Number of nodes have less than 3 points 12077
Table 2. Airborne laserscan information
4.2 Ground lidar example
Figure 9.a shows the original point cloud of the ground lidar
example. Extracted planes shown in Figure 9.b containing
98.7% of the total points. Figure 9.c shows the results after the
merge process. Figure 9.d, e, f, shows the results of merged
plane classified by area, gradient, average intensity respectively.
In Figure 9.e horizontal planes and vertical planes of the stairs
in front of the Gate can be classified obviously. Wall and roof
of the Gate and ground plane can be classified too.
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