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Abstract:
In the presented project, we focus on the digitization and refinement of the terrestrial gravimetric data observed in 1940–1961 period on the territory of the present day Czech Republic. The project aims to utilize most of these older gravimetric observations by correcting and homogenizing them to the modern geodetic reference systems. All available catalogues and data sources have been collected, digitized, and converted to the relational database. Also metadata are collected and converted to the database too. Besides, we digitized and georeferenced also the original analogue maps or schematic plots documenting the locations of the individual observations. All the digitized gravimetric data have been verified during the process. Data is transformed to modern geodetic reference systems with the aid of the acquired metadata. Finally, by applying geostatistical analysis techniques, data validity has been verified against later, more accurate terrestrial gravimetric data and new gravimetric observations. As the later observed gravity field is often affected by gravity changes and variations, we need to address all known mass transports, primarily sourced in later anthropogenic interference, as mines, quarries, dam reservoirs, etc. The described process enabled us to significantly improve the reliability, accuracy and georeference of all available terrestrial gravimetric data in the Czech Republic. The resulting homogenized gravimetric database can be used in any other project demanding accurate knowledge, or even time-differentiated knowledge, of the gravity field over the Czech Republic. Just as a geodetic applications, we can mention a quasigeoid modelling or realization of the normal heights geodetic reference system.
