Detection of granite landmarks in soil with GPR

In Germany plots of land were often marked with landmarks. They are typically made from granite stones in a defined shape and have been buried closely below the surface. The suitability of GPR for the detection of landmarks has been tested. GPR laboratory experiments in a sandbox under ideal conditions as well as field trials have been carried out. The influence of the water content of soil on the GPR measurements was investigated in laboratory. In these experiments suitable characteristic parameters have been identified to distinguish granite landmarks from other reflectors.