The investigation of the inner structures of historical buildings and their foundations is a rather sofisticated task. Because of different high amplitude disturbance sources geomagnetic surveys are not successful. Gravimetric effects of cavities and tombs inside the buildings are too low in comparison to the effects from the walls and ceilings. Only ground penetrating radar measurements and geoelectric methods have proved to be an effective tool to locate the different targets and to determine their three dimensional shape. A number of applications of these methods are widely documented in the literature. Objects of interest may he cavities, tombs, crypts, foundation structures or the condition of the walls. Classical geoelectric measurements inside of historical buildings are often difficult or impossible. In most of the cases it is necessary to drill holes to coupling the current and potential electrodes with the soil. The application of methods using the electrostatic quadrupol may overcome this problem. However, such investigations requires special measurement equipment. In the present work we integrated the high resolution GPR-measurements with three dimensional conductivity information, yielded from non-destructive geoelectrical measurements. This geoelectric examinations were carried out using special electrodes and standard measurement equipment. The target of the investigation was the detection of different subsurface structures inside the St.Trinitatis church of Meissen/Saxony.


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