Development of a DEM in the GIS “PANORAMA” Based on a Topographic Map for the Southern Territory of the Fergana Valley

The capabilities of GIS for constructing a digital elevation model of a mountainous area and visualizing a spatial image of the terrain are given in this paper. Graphic, digital data and topographic maps, which are the main sources for GIS, are described. The methods of vectorization of isolines and the requirements for technical means of processing graphic materials are presented in detail. The advantages and disadvantages of the DEM of a mountainous region are shown here. Segmentation methods using an interpolation polynomial are described in detail. A DEM of the mountainous area where the border between the republics runs was constructed in 2D and 3D formats using the GIS Panorama. Reducing the chord length when segmenting isolines on topographic maps leads to more accurate DEM construction. A vertical profile of a mountainous area with a visibility zone between two points was constructed. It is expected that the improved latitude, longitude and altitude parameters of the topographic map will be used to form a regional geodetic network and geospatial analysis of mountain ranges. It is proposed to use not only satellite data, but also classical geodetic networks and maps. It is recommended to use satellite and aerial photography to clarify the topographic and geodetic support of the studied area.

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