Measuring and depicting trouble areas in stereo-models. Paper presented at the 52nd Annual Meeting of the Highway Research Board HRB, Washington, D.C., January 1973.

Recognizing unstable landforms through photo and stereo-model interpretations are reported. A stereo-operator trained in interpreting landslide conditions can delineate this evidence during the mapping process. Research has produced a manual to train new interpreters through the recognition of troublesome areas.