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Extraction of building boundary
The process of extracting building boundary is performed on both
point and pseudo-grid domain. The boundary of each group is
linearized and simplified, and then interest points corresponding
to building corners are extracted.
Figure 4 shows one example of interest points extraction
process.
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3. EXPERIMENT RESULTS
The target area is located at Chungjoo city in Korea and its size
is about 1,100m(width)x750m(length). The equipment was
Optech's ALTM 1020. The flight height, flying speed, laser
repetition rate, swath width, width overlapping, and average
point density per pass are 1000m, 180 km/h, 5,000 Hz, 450 m,
87%, and 0.2/., respectively. The threshold values for
minimum building height and area are 5m and 50 [, respectively.
The raw laser scanning data of the target area is shown in Figure 5.
Figure 5. Raw laser scanning data of target area
International Archives of the Photogrammetry, Remote Sensing and Spatial Information Sciences, Vol XXXV, Part B3. Istanbul 2004
Figure 6 and 7 show the results after noise removal, segmentation,
tree removal and grouping, respectively.
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Figure 6. Result after noise removal and segmentation
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Figure 7. Result after tree removal and grouping
Figure 8 and 9 show the final results for buildings extracted in
3D vector format from top and perspective view, respectively.
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Figure 8. Final result for buildings in 3D vector format.(TOP)
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Part B3
