Photo-interpretation of boulder clay areas as an aid to engineering geological studies

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Abstract
Summary: The over-all view of the environment, the exploitation of vertical scale exaggeration and the use of film sensitive to soil moisture content, enables an experienced photo-interpreter to produce information that can supplement engineering geology studies made directly at the site. Reconnaissance soil mapping can be carried out in glacial areas by geomorphological methods supported by drainage, gully, vegetal and tonal characteristics, together with rapid field checks in selected characteristic areas. Numerical values are given for the proportion of buried bedrock features which have been detected in test areas covered with boulder clay, as well as for changes in detectability with variables such as the depth of superficial cover, the type of land use, and air photograph quality. The criteria for the identification of buried features are discussed, as well as the detection of landslides, subsidence, drainage and flooding problems, and the choice of airphoto-graph scale, materials and processes for engineering geological studies.

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