Photogrammetric approach for detection of rooftop illegal structures

Pao Yue-kong Library Electronic Theses Database

Photogrammetric approach for detection of rooftop illegal structures

 

Author: Liu, Di
Title: Photogrammetric approach for detection of rooftop illegal structures
Degree: M.Sc.
Year: 2013
Subject: Illegal buildings.
Buildings -- Addition.
Photogrammetry.
Geographic information systems.
Hong Kong Polytechnic University -- Dissertations
Department: Dept. of Land Surveying and Geo-Informatics
Pages: vii, 51 p. : ill. ; 30 cm.
Language: English
InnoPac Record: http://library.polyu.edu.hk/record=b2627092
URI: http://theses.lib.polyu.edu.hk/handle/200/7044
Abstract: Currently, village houses have been concerned by government in Hong Kong. Compared with other methods based on rooftop flat, this paper will introduce a new method based on building heights, according to the living situation in Hong Kong. This study aims to extract illegal rooftop structures to judge buildings whether belong to illegal or not. The data is divided into aerial photograph and building design data that both from government. The detection area is New Territories in Hong Kong, because village houses are the main buildings in this area. Photogrammetry and GIS as two main technologies are applied to this project. Firstly, produce DEM through aerial photograph. In this step, the control points are from Google Earth rather than GPS that can save time, reduce costs and improve work efficiently. The key point of this part is transformation coordination of control points, because of different coordination system. And choosing a suitable interpolation method is also important. Then compare the height from DEM image with building design data to detect building. Manual vectorization is necessary in this step, although there are huge data, because of the limited functions in software. Then calculate height different according to attribute table using SQL to obtain result. Finally, test detection result using hypothesis testing and filed-testing. This method carried out detection of rooftop illegal structures.

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