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- Title
Comparison Between First Pulse and Last Pulse Laser Scanner Data in the Automatic Detection of Buildings.
- Authors
Matikainen, Leena; Hyyppä, Juha; Kaartinen, Harri
- Abstract
A comparison between first pulse and last pulse laser scanner data in building detection was carried out. The automatic building detection method included region-based segmentation of a laser scanner derived digital surface model and classification of the segments by using the laser scanner data and an aerial ortho-image. Visual and numerical quality evaluations showed that the correctness of the results improved when last pulse data were used instead of first pulse data. According to a pixel-based comparison with a building map, the improvement was about 8 percentage units. The number of classification errors in the surroundings of the buildings decreased as a result of less vegetation. The number of false detections also decreased. These improvements were clearly shown by a building-based quality evaluation, where the inner part and surrounding area of each reference building was investigated and the number of false detections was calculated. For many buildings, the last pulse data with smaller buildings also corresponded better to the reference map, which improved correctness. The completeness of the results decreased slightly (about 2 percentage units according to the pixel-based comparison). One reason for this was the smaller buildings in the last pulse data.
- Subjects
LASERS; SCANNING systems; PULSE measurement; NUMERICAL analysis; DEMODULATION; COMPUTER software correctness; DIGITAL images; ERRORS; PIXELS
- Publication
Photogrammetric Engineering & Remote Sensing, 2009, Vol 75, Issue 2, p133
- ISSN
0099-1112
- Publication type
Article
- DOI
10.14358/PERS.75.2.133