26 November 2014 Fast extraction of building DEMs in urban areas from ALOS PRISM images
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Abstract
Digital elevation models (DEMs) of buildings in urban areas are becoming increasingly important for a large range of applications, whereas extracting building DEMs over a city is still a complicated and expensive task. In this paper, we present and evaluate two approaches for fast and handy extraction of building DEMs from ALOS PRISM stereo pairs. A Digital Surface Model (DSM) is firstly generated based on the stereo data. Approach 1 uses a digital terrain model (DTM) derived from topographic maps, and Approach 2 creates another DTM by removing buildings on the DSM through a filtering approach. Building DEMs are then acquired by subtracting the two sets of DTMs from the DSM, respectively. The results received with the two approaches are promising. A mean absolute error of 7.07 m and 7.37 m respectively is achieved. Approach 1 has better accuracy in areas with high-density buildings, while Approach 2 has better one in areas with low-density buildings. Combination of the two approaches would be a useful tool for extraction of building DEMs over a city.
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Xunfeng Yang, Zhou Lin, Hongying Liang, "Fast extraction of building DEMs in urban areas from ALOS PRISM images", Proc. SPIE 9263, Multispectral, Hyperspectral, and Ultraspectral Remote Sensing Technology, Techniques and Applications V, 92632X (26 November 2014); doi: 10.1117/12.2070824; https://doi.org/10.1117/12.2070824
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