Publicação: Extraction of Building Roof Contours From LiDAR Data Using a Markov-Random-Field-Based Approach
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Institute of Electrical and Electronics Engineers (IEEE)
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This paper proposes a method for the automatic extraction of building roof contours from a digital surface model (DSM) by regularizing light detection and ranging (LiDAR) data. The method uses two steps. First, to detect aboveground objects (buildings, trees, etc.), the DSM is segmented through a recursive splitting technique followed by a region-merging process. Vectorization and polygonization are used to obtain polyline representations of the detected aboveground objects. Second, building roof contours are identified from among the aboveground objects by optimizing a Markov-random-field-based energy function that embodies roof contour attributes and spatial constraints. The optimal configuration of building roof contours is found by minimizing the energy function using a simulated annealing algorithm. Experiments carried out with the LiDAR-based DSM show that the proposed method works properly, as it provides roof contour information with approximately 90% shape accuracy and no verified false positives.
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Building roof contours, digital surface model (DSM), Markov random field (MRF), simulated annealing (SA)
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Inglês
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IEEE Transactions on Geoscience and Remote Sensing. Piscataway: IEEE-Inst Electrical Electronics Engineers Inc, v. 50, n. 3, p. 981-987, 2012.
