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This paper presents an approach for a semantically correct integration of a 2.5D digital terrain model (DTM) and a 2D topographic GIS data set. The algorithm is based on a constrained Delaunay triangulation. The polygons of the topographic objects are first integrated without considering the semantics of the object. Then, those objects which contain implicit height information are dealt with. Object...
A lot of attention has been paid to generalization (filtering) of Digital Elevation Models (DEMs) and the same is true for generalization of 2D object models (e.g. topographic or land use data). In addition there is a tendency to integrate DEMs with classified real-world objects or features, the result is sometimes called a Digital Terrain Model (DTM). However, there has not been much research on...
A model of automatically detecting the building shadows in high resolution aerial remote sensing image is introduced in this paper. The space coordinates of the shadows are first computed using photogrammetric engineering. To do this, digital surface model (DSM) and the sun zenith and azimuth angles are used. By camera model, the scanning line and the camera position are calculated for each space...
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