Extract
Semi-automatic modeling of buildings from digital surface models.
Introduction
The airborne laser scanner employs active scanners which use laser signals to measure slant distances in order to acquire three-dimensional information (X, Y, Z) about the surface of the Earth and objects on it. This type of laser scanner emits pulsed laser light at exactly determined time intervals and measures the elapsed time between transmission and reception of these laser pulses (Steinle and Vogtle 2000). A good overview of laser scanner technology can be found in Wher and Lohr (1999). Semi-automatic detection and three-dimensional modeling of buildings and other cultural features in a landscape are topics of growing interest for urban planning and are useful in other applications such as cartographic updating, maintenance of cadastral databases, and geographic information systems (GIS). Various procedures for modeling buildings and other human structures using laser scanner images have been published in the literature. For instance: * Haala et al (1997) used parametric building models; they determined the shape and position parameters by fitting the models to the height data. * Haala and Brenner (1999) demonstrated several approaches for the segmentation of digital surface models (DSMs) and their use for bui...See the full content of this document
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