Infra-red multispectral remote sensing can supply data to supplement the information provided by aerial photographs for geological and geomorphological mapping of areas of the earth's surface.

The shades of colours obtained by combining the black and white images of the spectral bands are due partly to differences in the spectral emissivity of the surface, and partly to variations in the thermal properties of the surface materials, themselves dependent upon the nature and state of the surface.

In this paper, the author describes a case study carried out in the vicinity of Carcassonne (Aude, France) where, at several scales, the imagery obtained by aerial survey has helped to define boundaries, for example, between the alluvial terraces and the molassic formations of Lutetien, and between various types of alluvial sediments.

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