BUILDING ROOF BOUNDARY EXTRACTION FROM LiDAR AND I... - BV FAPESP
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BUILDING ROOF BOUNDARY EXTRACTION FROM LiDAR AND IMAGE DATA BASED ON MARKOV RANDOM FIELD

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Autor(es):
Dal Poz, A. P. ; Fernandes, V. J. M. ; Heipke, C ; Jacobsen, K ; Stilla, U ; Rottensteiner, F ; Yilmaz, A ; YingYang, M ; Skaloud, J ; Colomina, I
Número total de Autores: 10
Tipo de documento: Artigo Científico
Fonte: XXIII ISPRS CONGRESS, COMMISSION V; v. 42-1, n. W1, p. 6-pg., 2017-01-01.
Resumo

In this paper a method for automatic extraction of building roof boundaries is proposed, which combines LiDAR data and high-resolution aerial images. The proposed method is based on three steps. In the first step aboveground objects are extracted from LiDAR data. Initially a filtering algorithm is used to process the original LiDAR data for getting ground and non-ground points. Then, a region-growing procedure and the convex hull algorithm are sequentially used to extract polylines that represent aboveground objects from the non-ground point cloud. The second step consists in extracting corresponding LiDAR-derived aboveground objects from a high-resolution aerial image. In order to avoid searching for the interest objects over the whole image, the LiDAR-derived aboveground objects' polylines are photogrammetrically projected onto the image space and rectangular bounding boxes (sub-images) that enclose projected polylines are generated. Each sub-image is processed for extracting the polyline that represents the interest aboveground object within the selected sub-image. Last step consists in identifying polylines that represent building roof boundaries. We use the Markov Random Field (MRF) model for modelling building roof characteristics and spatial configurations. Polylines that represent building roof boundaries are found by optimizing the resulting MRF energy function using the Genetic Algorithm. Experimental results are presented and discussed in this paper. (AU)

Processo FAPESP: 13/13138-0 - Extração automática de contornos de edificação usando imagens aéreas de altíssima resolução e dados de varredura a laser
Beneficiário:Aluir Porfírio Dal Poz
Modalidade de apoio: Auxílio à Pesquisa - Regular
Processo FAPESP: 12/22332-2 - Extração de contornos de telhados de edifícios a partir da integração de imagem aérea de alta-resolução e dados LASER, utilizando campos aleatórios de Markov
Beneficiário:Vanessa Jordão Marcato Fernandes
Modalidade de apoio: Bolsas no Brasil - Doutorado