GPR data interpretation in the landslides and subgrade slope surveys Viktor Pupatenko, Yuri Sukhobok, Gennady Stoyanovich, Andrey Stetsyuk and Leonid Verkhovtsev MATEC Web Conf., 265 (2019) 03003 Published online: 30 January 2019 DOI: 10.1051/matecconf/201926503003