In Figure 3, roof points are segmented in plane patches for four
houses. In Figure 3a, the segmentation of a hipped roof is
represented. Figure 3b shows the segmentation of roof points
for a gabled roof, whereas the blue and cyan points indicate the
covers of two roof windows. Figure 3c and 3d shows the results
of the segmentation for a cross gabled roof and a roof with two
dormers respectively. The roofs from Figure 3a to 3d become
more and more complicated. Nevertheless, the proposed
algorithm can cluster points to their corresponding plane
patches.
In the following, experimental results are shown for segmenting
roof points and extracting polygon for each roof plane patch by
taking three houses as examples.
Figure.4. Segmentation of roof points for a simple gabled roof
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Figure.6. Segmentation of roof points for a hipped roof with
multi-ridges
In Figure 4, 5 and 6, the extracted polygons can represent their
roof structures very well. However, the situation seems totally
differently for the three houses in Figure 3 (Figure 3b, 3c and
3d), because the main polygons of these roofs are too
complicated to be extracted exactly using the current algorithm.
So far, the topologies among roof polygons are not yet adjusted,
neither their corresponding geometries near the sharing sides of
polygons; therefore, there are gaps among roof polygons. This
will be improved in the nearest future.
100
Acknowledgements
The presented work is partly supported by the NSFC (National
Natural Science Foundation of China) project No: 41101443.
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