Multisensor monitoring of ground movements over large areas to conduct the change from the active underground hard coal mining ages to the post-mining era

Abstract

[EN] End of 2018 about 300 years of underground deep hard coal mining in Germany came to an end. Under regard to the ordinances of the mining authorities, RAG Aktiengesellschaft (RAG) further on remains responsible for the effects of the former underground mining in the post-mining era (Hager and Wollnik, 2016). The current and future geometric monitoring based on official federal reference networks concerns the tasks to record the fading mining induced subsidence movements and to detect the beginning uplifts to the earth surface resulting from to the controlled, ordinated flooding of the underground mine building. The geometric monitoring of the earth surface had up to now steadily been adapted to the state of the art by the integration of research and development projects (R&D) into day-to-day business, like for GIS, “4D”-databases, terrestrial GNSS surveying, high-end photogrammetry and InSAR remote sensing techniques, following national (DIN) and international standards (CEN, ISO). With the participation of Saarland’s federal ordnance survey, LVGL[1], the reformation of the traditional, current surveillance networks to a modern Multisensor - Referencestation Network (MSST Network) has been realized in spring 2022 by a GNSS- and InSAR-based ground movement cadastre (SaarBoBeKa). A close cooperation with the companies Allsat[2] and Geotec[3] led to the development of an innovative time-variant network adjustment method for long time series of GNSS monitoring stations. [1] LVGL: Landesamt für Vermessung, Geoinformation und Landentwicklung des Saarlands, Deutschland [2] Allsat: ALLSAT GmbH – Die GNSS Spezialisten. Sokelantstr. 5, 30165 Hannover, Deutschland. [3] Geotec: GEOTEC – Geodaetische Technologien GmbH, Heinrich-Heine-Weg 69, 30880 Laatzen, Deutschland.