A Methodology for Processing Raw LIDAR Data to Support Urban Flood Modelling Framework

A Methodology for Processing Raw LIDAR Data to Support Urban Flood Modelling Framework

Abdullah, A.F.B.

Price, R.K. (promotor)

Civil Engineering and Geosciences

Water Management

2012-03-21

In the last few decades, the consequences of floods and flash floods in many parts of the world have been devastating. One way of improving flood management practice is to invest in data collection and modelling activities which enable an understanding of the functioning of a system and the selection of optimal mitigation measures. A Digital Terrain Model (DTM) provides the most essential information for flood manager. Light Detection and Ranging (LiDAR) surveys which enable the capture of spot heights at a spacing of 0.5m to 5m with a horizontal accuracy of 0.3m and a vertical accuracy of 0.15m can be used to develop high accuracy DTM but it need careful processing before it can be used for any application. The research presents the augmentation of an existing Progressive Morphological filtering algorithm for processing raw LiDAR data to support a 1D/2D urban flood modelling framework. The key characteristics of this improved algorithm are: (1) the ability to deal with different kinds of buildings; (2) the ability to detect elevated road/rail lines and represent them in accordance to the reality; (3) the ability to deal with bridges and riverbanks; and (4) the ability to recover curbs and the use of appropriated roughness coefficient of Manning’s value to represent close-to-earth vegetation (e.g. grass and small bush).

digital terrain models
lidar filtering algorithms
urban features
urban flood modelling

http://resolver.tudelft.nl/uuid:91da51db-0bbf-4aa2-8137-cf197ad82d37

CRC Press/Balkema

978-0-415-62475-6

Institutional Repository

doctoral thesis

(c) 2012 Abdullah, A.F.B.