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THE ANALYSIS OF THE ACCURACY OF DIGITAL TERRAIN MODEL (DTM) OBTAINED FROM HIGH RESOLUTION GEOEYE-1 SATELLITE IMAGERY
Abstract
The Digital Terrain Model (DTM) is a set of XYZ coordinates of appropriately selected points of the terrain surface created as its digital representation and the algorithms enabling the reconstruction of its shape in a specific area. The quality of a DTM depends on several factors like precision, accuracy and reliability of the measurements. This study was conducted in order to develop and evaluate the method enabling the analysis of the accuracy of the DTM without field measurements. The research was carried out using two panchromatic (stereo) scenes acquired on June 2, 2009 by the GeoEye-1 satellite. The images have been provided in GeoTIFF format along with metadata and Rational Polynomial Coefficient (RPC) data. The images have been acquired at ground resolution of 0.50 m and the overlap of 98.9%. The size of one scene is about 120 km2. The imageries represent the surroundings of the city of Hobart in Australia. Our research was made according to following plan. First, the external orientation of scenes with the Leica Photogrammetry Suite software was made. The orientation was carried out for three different variants differing in the spatial distribution of the ground control points and the check points. Then the best variant was chosen for the next stage of research. On its basis three DTM models with mesh sizes of 15, 20 and 25 meters were generated using the Area Based Matching method with Erdas Imagine Software. The obtained models were evaluated by comparing the correlation and the total error of the mean orientation. We submitted the best DTM to ortho-rectification using the Bilinear Interpolation Method. The obtained ortho image was compared with the original scene from GeoEye-1. The results confirmed the possibility of using the adopted method to create DTM without the need to make field measurements.
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