Abstract
Abstract. Digital Surface Models (DSMs) are representing the visible surface of the earth by the height corresponding to its X-, Y-location and height value Z. The quality of a DSM can be described by the accuracy and the morphologic details. Both depend upon the used input information, the used technique and the roughness of the terrain. The influence of the topographic details to the DSM quality is shown for the test fields Istanbul and Zonguldak. Zonguldak has a rough mountainous character with heights from sea level up to 1640m, while Istanbul is dominated by rolling hills going up to an elevation of 435m. DSMs from SPOT-5, the SRTM C-band height models and ASTER GDEM have been investigated. The DSMs have been verified with height models from large scale aerial photos being more accurate and including morphologic details. It was necessary to determine and respect shifts of the height models caused by datum problems and orientation of the height models. The DSM quality is analyzed depending upon the terrain inclination. The DSM quality differs for both test fields. The morphologic quality depends upon the point spacing of the analyzed DSMs and the terrain characteristics.
Highlights
Digital Surface Models (DSMs) are the three dimensional (3D) presentation of the visible Earth surface including entire objects like buildings, roads, vegetation, forest etc. among bare topography
The qualities of SPOT-5 High Resolution Stereoscopic instrument (HRS), ASTER GDEM and SRTM DSMs have been analyzed at two different test fields (Istanbul and Zonguldak) in Turkey which have different topographic characteristics
As it can be seen from above figures, the structure of contour lines generated from SPOT-5 HRS is more detailed
Summary
Digital Surface Models (DSMs) are the three dimensional (3D) presentation of the visible Earth surface including entire objects like buildings, roads, vegetation, forest etc. among bare topography. They are a basic element for the analysis of several kinds of engineering disciplines. To satisfy this need, various DSM generation techniques have been improved. The qualities of SPOT-5 HRS, ASTER GDEM and SRTM DSMs have been analyzed at two different test fields (Istanbul and Zonguldak) in Turkey which have different topographic characteristics. At both test fields, more accurate reference Digital Elevation Models (DEMs) produced by photogrammetry have been used for the accuracy analysis
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