Scholarly record
A DATA-DRIVEN AUTOMATED GIS-BASED APPROACH FOR PROCESSING PRECISE LEVELING DATA FOR THE ANALYSIS OF VERTICAL CRUSTAL MOVEMENTS
Abstract
In the process of establishing the National Leveling Network (NLN), the individual cycles are associated with the use of different technologies, instruments, and methods for data structuring and processing. The study focuses on the territory of Bulgaria, where in the last three leveling cycles, various methodological and technological approaches for data organization, processing, and analysis have been applied. In this context, taking into consideration the large volume of accumulated data from the different realizations, an automated approach is proposed for their systematization, structuring, storage, visualization, and subsequent use. The proposed approach is based on the integration of precise leveling data into a geospatial database and its use in a GIS environment. Benchmarks, elevations, leveling lines, and polygons corresponding to different observation cycles are represented as spatial objects. This data model allows systematic organization of the data and enables automated processing, including data import, identification of common benchmarks observed in different epochs, computation of height differences, and comparison of the normal heights in order to determine the vertical displacements, as well as subsequent analysis of vertical crustal movements. Statistical analysis is applied to assess the reliability of the computed height differences and to identify potential outliers. The calculated vertical movements are further analyzed in a GIS environment, which enables spatial modeling, visualization, and interpretation of vertical movement patterns. Based on the conducted research and the experimental data, recommendations are provided regarding the optimal use of multi-epoch precise leveling data, which can support the monitoring of vertical displacements, as demonstrated in this study, as well as for geoid determination, modeling of the terrain relief, and the gravity field.
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