Improvement of DEM quality with evaluation of various methods for generating DEM from vectors

摘要

Rapid growth of using Digital Elevation Model in diverse scientific fields leads to more sensibility about the quality of data as well as the production methods. The purpose of this research is assessing different methods of DEM generation using existing maps, selecting the best way to reduce the errors, and increasing the confidence level. Therefore, to produce the finest Digital Elevation Model two important factors have been regarded; the input data and the model construction techniques. This research includes assessing the input data, the model structure, and interpolation. In this study, digital maps at scale 1:25000 have been used and evaluated for generating DEM. After evaluating the accuracy and correctness of input data, two types of earth surface model constructions have been evaluated; Grid-based and TINbased models. These tests were carried out at areas with diverse distribution and types of features to figure out detailed effect of methods in areas with different objects. All evaluations also demonstrate that each algorithm and model have strong and weak points which make them more efficient and proper for using in particular areas.