Assessment of digital elevation models using RTK GPS
نویسندگان
چکیده
A Digital Elevation Model (DEM) represents the height of a patch of terrain. Accuracies of DEMs vary depending upon the requirements of different applications. DEMs have been applied to a wide range of civil engineering and military planning tasks. Besides the conventional methods of creating DEMs, such as photogrammetry and manual field survey, airborne laser scanning and radar interferometry are new technologies capable of creating high quality DEMs in a cost-effective manner. This paper uses Real-Time Kinematic (RTK) GPS (with centimetre-level accuracy) to examine the quality of some DEMs generated by such means as photogrammetry, airborne laser scanning and radar interferometry. The results show that a DEM generated from airborne laser scanning has the highest accuracy with a RMS error of 0.09 ~ 0.3m. The RMS errors of DEMS derived by photogrammetric and radar interferometric means are 1.35 ~ 2.43m and 4.26 ~ 19.39m respectively.
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