COMPARISON OF THE RELIABILITY OF CALCULATING THE VOLUMES OF GRAVITATIONAL BODIES BY MEANS OF THE ARCGIS SOFTWARE PACKAGE AND THE SCIPY PYTHON LIBRARY
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Abstract
The article is the study continuation of the assessing of Earth's gravitational field variations (GFV) effect on the results of repeated leveling using modern means of geospatial analysis when observing deformations of natural and engineering objects. The main problems that arise when calculating volumes by means of ArcGIS are reflected. A new method for calculating the corrections for GFV using the python library scipy.spatial is proposed. The inexpediency of performing "enclosure" of Multipatch objects using the Enclose Multipatch tool is proved. The volumes calculated with and without "enclosure" are compared, as well as for "enclosed" objects – volumes calculated with the built-in tools of ArcGIS and using python libraries. The relationship of volume distortion in the calculation by different methods with the concomitant change in the surface area of the object, the number of vertices and the size along the Z axis is established. The comparison of the corrections for the GFV calculated using python libraries with the previously calculated built-in tools of ArcGIS has been performed. Testing of the technique was carried out on real data of cone models of the Great Fractured Tolbachinsky eruption on the Kamchatka Peninsula.
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