Reconstruction of building roof contours and ridges using high-resolution aerial images and polyhedra representing buildings extracted from laser data

• Grant number: 11/03899-9
• Support Opportunities: Scholarships in Brazil - Master
• Start date: August 01, 2011
• End date: February 28, 2013
• Field of knowledge: Physical Sciences and Mathematics - Geosciences - Geodesy
• Principal Investigator: Aluir Porfírio Dal Poz
• Grantee: Vanessa Jordão Marcato Fernandes
• Host Institution: Faculdade de Ciências e Tecnologia (FCT). Universidade Estadual Paulista (UNESP). Campus de Presidente Prudente. Presidente Prudente , SP, Brazil

Abstract

This Project proposes improvements in a previous methodology for the geometric refinement of building roof contours extracted from laser data using high-resolution aerial images and Markov Random Field (MRF) models. One of the improvements is to include in the energy function associated with the MRF a restriction called corner injuction. This restriction considers that the intersection of two adjacent lines, corresponding to the contour sides, should be close to a corner in 90º. The corners are extracted from an image through an appropriate image processing algorithm. Other improvement in the energy function is based on the fact that the lines representing roof contours are aproximately parallel or orthogonal. This restriction was called rectangularity injuction. Other modification in the original methodology refers to the energy function optimization algorithm. The original methodology used the brute force optimization algorithm associated with some heuristics. Although this method allows to obtain the optimal solution, if there is, the search space becomes computationally intractable when dozens of lines are in the search space. It is proposed to use a genetic algorithm in order to solve this problem. This algorithm should enable the solution of the optimization problem in situations not feasible for the original methodology. One complex case would be a setting with many buildings with contoursand ridges modelling. The proposed methodology will be evaluated based on real data - high-resolution aerial images, 3D data from laser scanning and polyhedra building extracted from laser data. (AU)

Scientific publications

(References retrieved automatically from Web of Science and SciELO through information on FAPESP grants and their corresponding numbers as mentioned in the publications by the authors)

VANESSA JORDÃO MARCATO; ALUIR PORFÍRIO DAL POZ. REFINAMENTO GEOMÉTRICO DE CONTORNOS E CUMEEIRAS DE TELHADOS DE EDIFÍCIOS EXTRAÍDOS DE DADOS LASER COM USO DE IMAGEM AÉREA. Bol. Ciênc. Geod., v. 20, n. 3, p. 647-668, 2014-09-00. (11/03899-9)

Academic Publications

(References retrieved automatically from State of São Paulo Research Institutions)

FERNANDES, Vanessa Jordão Marcato. Reconstrução de contornos e cumeeiras de telhados de edifícios a partir de imagens aéreas de alta-resolução e poliedros representativos de edifícios extraídos de dados LASER. 2013. Master's Dissertation - Universidade Estadual Paulista (Unesp). Faculdade de Ciências e Tecnologia. Presidente Prudente Presidente Prudente.