This article deals with doline degradation due to uncontrolled waste dumping in the past in the Logatec Polje in Slovenia. It introduces a concept for determining 3D geometric characteristics (shape, depth, radius, area, and volume) of formerly concave landforms (i.e., recently filled dolines) by using a combination of two methods, namely photogrammetric stereo processing of archival aerial photographs and electrical resistivity imaging. To represent, visualize, and study the characteristics of the former surface morphology, a digital terrain model (DTM) for 1972 (DTM1972) was made using digital photogrammetry processing of five sequential archival aerial photographs. DTM1972 was visually and quantitatively compared with the DTM5 of the recent surface morfology in order to define areas of manmade terrain differences. In general, a circular area with a higher terrain difference is an indicator of a filled doline. The calculated terrain differences also indicate the thickness of buried waste material.