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Abstract
The techniques of extracting metric information from aerial photography are very well established in surveying and civil engineering applications. In the last three decades, however, developments in satellite and airbone sensors, together with improvements in computing speed and reductions in the costs of computer, have led to the creation of the relatively new discipline of remote sensing. Remote sensing is proving to be a cost-effective method of investating regional engineering phnomena. It is also being used extensively in topographic mapping applications. This study investigates the accuary of topographic maps obtained by remote sensing methods, which is arelatively `new technology with promsing potential for the production of small scale maps for large areas