期刊名称：ISPRS Annals of the Photogrammetry, Remote Sensing and Spatial Information Sciences
印刷版ISSN：2194-9042
电子版ISSN：2194-9050
出版年度：2000
卷号：XXXIII Part B3(/1+2)
页码：556-562
出版社：Copernicus Publications
摘要：We have developed a method to automatically generate a 3-D city model only from laser scanner data by applying region segmentation to the grid type data of digital surface model (DSM) obtained by the scanner. Each building has a distinct height difference from the surroundings. Therefore we can distinguish each buildings by segmenting the DSM with the condition that a pixel having the height difference within a predetermined threshold from a neighboring pixel belongs to the same region. Results are given for parts of two different type cities, Minokamo and Tsukuba, Japan. We evaluate from these results that this method is useful to promptly obtain 3-D city models in vector format because the model is generated through automatic processing of the data. But the resulting model is not yet suited for direct usage in GIS because the resulting polyhedrons obtained by this method correspond to parts of buildings and not necessarily to each building. It is suited in particular for 3-D scenery reconstruction as can be seen in the figures of the bird's-eye view. This method, however, has its intrinsic problems that in some condition even large buildings cannot be distinguished from road surface. This means that these buildings disappear in the obtained 3-D model. Another problem is that the extracted objects are not always buildings or houses but, for example, trees are included. These issues are also discussed in the paper
关键词：Laser/Lidar; Urban objects; DTM/DEM/DSM; Modeling; Buildings; GIS; Data acquisition
