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Abstract:
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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. |