Comparative Analysis Regarding GIS Interpolation Methods in the Problems of Spatial Analysis and Obtaining MDT

Interpolation methods are essential tools for generating the Digital Terrain Model (MDT). Making a comparison between different interpolation methods in the GIS environment, by using the Geostatistical Analyst function, will indicate the degree of accuracy of each method. The quality of the Digital Terrain Model (DTM) depends on the accuracy of the measured data, the techniques and software used in the measurement processing stage. In this paper, three interpolation methods available in ArcGIS software are analyzed: Inverse Distance Weighted (IDW), Local Polynomial Interpolation (LPI), and Kriging. Two scenarios were considered in the study: in the first, an area with a steep slope was analyzed, in the second scenario, a gently sloping area was analyzed. The techniques for performing topographic measurements were of the modern type, respectively the current use of satellite technology. Measurements for both scenarios were performed using GNSS technology and the RTK method for determining point coordinates in real time. The location of the studied areas is in Iași county, Miroslava commune.