Developments in analytical photogrammetry provide the engineering geologist and geomorphologist with a quantitative technique capable of monitoring slope instability from ground or oblique aerial photographs. This paper outlines ‘analytical’ photogrammetry and its applications to the study of slope instability. Procedures and developments in data processing are described that enable both a morphogenetic analysis of slope form and the derivation of displacement vectors for monitoring unstable slopes. The methods are illustrated by research work carried out by the authors in Nepal and southern England.

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