| 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: | Department of Land Surveying and Geo-Informatics |
| Pages: | vii, 51 p. : ill. ; 30 cm. |
| Language: | English |
| 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. |
| Rights: | All rights reserved |
| Access: | restricted access |
Files in This Item:
| File | Description | Size | Format | |
|---|---|---|---|---|
| b26270924.pdf | For All Users (off-campus access for PolyU Staff & Students only) | 2.32 MB | Adobe PDF | View/Open |
Copyright Undertaking
As a bona fide Library user, I declare that:
- I will abide by the rules and legal ordinances governing copyright regarding the use of the Database.
- I will use the Database for the purpose of my research or private study only and not for circulation or further reproduction or any other purpose.
- I agree to indemnify and hold the University harmless from and against any loss, damage, cost, liability or expenses arising from copyright infringement or unauthorized usage.
By downloading any item(s) listed above, you acknowledge that you have read and understood the copyright undertaking as stated above, and agree to be bound by all of its terms.
Please use this identifier to cite or link to this item:
https://theses.lib.polyu.edu.hk/handle/200/7044