Geodetic fundamentals in the development of a voxel model for the subsoil of the city of Sevilla (Spain)

Abstract

Current global challenges require a better understanding of the subsoil to optimise underground resources and plan for sustainable development. This is a key issue in anthropised metropolitan environments, where the high density of elements makes difficult to gain knowledge of this reality. The use of Geographic Information Systems (GIS) enables spatial management and visualisation of the underground data obtained from geotechnical surveys. The creation of 3D models in voxel format constitutes a pioneering and relevant line of research. This paper evaluates the main factors resulting from the integration of different topographic sources at a territorial level for the creation of surface models that efficiently adjust the geotechnical data collected, which usually lacks global height values. This task involved designing a coordinate system and a reference grid, as well as adjusting elevation data for the selected study case: the metropolitan area of Sevilla, Spain.