Abstract
The article considers the question of estimating the accuracy of interpolation methods for building digital elevation models using Soviet topographic maps. The territory of the Kursk region of the Russian Federation was used as the study area, because it is located on the Central Russian Upland and characterized by the complex structure of the vertical and horizontal dissection of the relief. Contour lines automatically obtained using a Python algorithm were used as the initial elevation data to build a digital elevation model. Digital elevation models obtained by thirteen different interpolation methods in ArcGIS and Surfer software were built and analyzed. Special attention is paid to the ANUDEM method, which allows to obtain hydrologically correct digital elevation models. Recommendations for the use of one or another method of interpolation are given. The results can be useful for professionals who use topographic maps in their work and deals with the design using digital elevation models.
Highlights
One of the ways to depict the terrain using modern geoinformation technologies (GIT) is to build a digital elevation model (DEM)
According to Pivnyak et al (2014) DEM is a file of elevation values attached to nodes of a rather small regular network and organized in the form of a rectangular matrix, which is a digital expression of elevation characteristics on the topographic map
In order to analyze the accuracy of the DEM built with each of the 13 interpolation methods, check points were used (Figure 14), which were selected with taking into account the peculiarities of the terrain and hydrographic network and were evenly distributed over the study area
Summary
One of the ways to depict the terrain using modern geoinformation technologies (GIT) is to build a digital elevation model (DEM). According to the definition given on the website of the US Geological Survey, DEMs are arrays of regularly spaced elevation values referenced horizontally either to a Universal Transverse Mercator (UTM) projection or to a geographic coordinate system. DEM is often defined as a regular array of heights counted from any reference surface (Wood, 1996). According to Pivnyak et al (2014) DEM is a file of elevation values attached to nodes of a rather small regular network and organized in the form of a rectangular matrix, which is a digital expression of elevation characteristics on the topographic map
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