ABSTRACT
The creation of maps by aerial photogrammetry and the interpretation of information from aerial photography are two well-established techniques in surveying and civil engineering. In recent years, however, developments in satellite and airborne sensors, together with improvements in computing speed and reductions in the costs of computer memory, have led to the creation of the relatively new discipline of remote sensing. Although still in an embryonic state, particularly in the field of image processing, remote sensing is nevertheless proving to be a cost-effective method of investigating regional engineering phenomena, such as surface drainage, and more localized phenomena such as landslides, building heat loss and so on. It is also being used, although to a much more limited extent, for topographic and hydrographic mapping.
