EVALUATION OF ACCURACY OF DIGITAL TERRAIN MODELING METHODS BASED ON SPATIAL INTERPOLATION (Part 2)

Digital terrain model (DTM) is an integral part of many geodetic works. It allows accurately reproducing the earth's surface in a digital form with varying levels detail. One most significant problems creating DTM accuracy reflecting relief. In first work, analysis methods that can more detailed reflect relief was already conducted. For these purposes, Surfer geoinformation package selected, which offers considerable number based on spatial interpolation algorithm. Although have represented same area high detail, there still need to assess each method. The purpose this article for constructing interpolation. Since crucial factor works, it necessary determine are accurate and meet requirements different purposes use. assessment will improve efficiency works avoid errors additional costs. program, after method, report be obtained containing input values points This very useful assessing method since understanding how well reflects real To control variable Z were taken, interpolated makes possible obtain numerical characteristic compare them other. Based conducted, concluded problematic areas identified fragment topographic map, where insufficient data result not could better from instruments technologies such as GPS, lidar, etc. "Natural Neighbor" performed best elevation hilly terrain. application "Kriging," "Triangulation Linear Interpolation," "Modified Shepard's Method," "Radial Basic Function" provided fairly However, "Minimum Curvature" found ineffective did provide After conducting assessment, high-quality extremely important element achieving results when model. Keywords: model, construction methods, interpolation, geographic information system, Surfer.