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Geophysical Data Processing

Great advancements were made in the development of appropriate tools for the processing and visualisation of the geophysical prospection data which capable of efficiently handling very large quantities of high-resolution data. The functionality to process and visualise magnetic and GPR data recorded along irregular paths was developed, tested, and continuously improved, resulting in streamlined, highly effective geophysical data processing solutions, including advanced processing steps such as GPR data migration in 2D and 3D, the output of coverage shape files and generation of geo-referenced data images for subsequent data analysis and interpretation in GIS. Functionality and efficiency of the available software are unparalleled; for example, it is currently possible to generate individual GPR depth slices for up to 72 hectare large data sets in relatively short time (processing time ca. 15 min/ha).

A considerable number of latest generation RTK-GPS receivers (JAVAD, LEICA, ALTUS) have been tested, configured and adapted for the use with the geophysical prospection systems. During the case study Vestfold an ALTUS RTK-GPS from the Norwegian partner NIKU was configured for the use with the motorized fluxgate magnetometer systems. The MIRA radios and robotic LEICA TCRP 1200 total station were successfully tested at Carnuntum for the positioning of the caesium magnetometer in situations where GPS reception is problematic. The change to continuously time triggered GPR data acquisition in combination with GPS positioning led to much improved data positioning.

Navigation and guidance systems were successfully implemented through the in-house developed LoggerVIS software interface for both magnetic and GPR surveys. This solution was thoroughly tested within the case studies, leading to further improvements.