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Báo cáo " Assessment of the influence of interpolation techniques on the accuracy of digital elevation model "

Digital Elevation Model (DEM) is an important component of GIS applications in many socio-economic areas. Especially, DEM has a very important role in monitoring and managing natural resources, preventing natural hazards, and supporting spatial decision making. Usually, DEM is built by interpolation from a limited set of sample points. Thus, the accuracy of the DEM is depended on the used interpolation method. By analyzing the data of experimental DEM creation using three popular interpolation techniques (inverse distance weighted - IDW, spline, and kriging) in four different survey projects (Thai Nguyen, Go Cong Tay, Co Loa, and Duong. | VNU Journal of Science Earth Sciences 24 2008 176-183 Assessment of the influence of interpolation techniques on the accuracy of digital elevation model Tran Quoc Binh1 Nguyen Thanh Thuy2 h College of Science VNU 2 Institute of Surveying and Mapping MoNRE Received 10 December 2008 received in revised form 26 December 2008. Abstract. Digital Elevation Model DEM is an important component of GIS applications in many socio-economic areas. Especially DEM has a very important role in monitoring and managing natural resources preventing natural hazards and supporting spatial decision making. Usually DEM is built by interpolation from a limited set of sample points. Thus the accuracy of the DEM is depended on the used interpolation method. By analyzing the data of experimental DEM creation using three popular interpolation techniques inverse distance weighted - IDW spline and kriging in four different survey projects Thai Nguyen Go Cong Tay Co Loa and Duong Lam the paper has made an assessment of influence of interpolation technique on the DEM accuracy. Based on that some recommendations on choosing interpolation technique has been made for mountainous areas the spline regularized is the most suitable for hilly and flat areas the IDW or kriging ordinary with exponential model of variogram are recommended. Keywords Digital elevation model DEM DEM accuracy Interpolation technique. 1. Introduction Digital elevation model DEM is an important part of the spatial data infrastructure SDI . DEMs are widely used in natural resource management natural hazard prevention land-related decision making etc. Usually the DEMs are produced by interpolating the elevations of a set of sample points for predicting the elevations at all positions inside the DEM area 4 . Consequently interpolation technique will contribute to the error budget of DEM. Corresponding author. Tel. 84-4-38581420. E-mail binh.geomatics@gmail.com Several researches were conducted on the relation between DEM accuracy .