Medium scale mapping from spot stereo imagery based on an approximate and simplified approach for data processing

Abstract

The main objective of this paper is to suggest, for non-photogrammetric users, a simple, economic and accuracy - satisfying method for SPOT data processing. Such method is applied as a practical test, based on a pilot project basis. For instance, the suggested simplified method is fully studied here by applying it to a stereopair of SPOT images covering 52 km x 60 km in South-West of Sinai in Egypt. The images are of level IB and have a base to height ratio near to one. The method depends mainly on the traditional analytical photogrammetric techniques, neglecting thereby the SPOT image geometry to a great extent. The control points are deduced from 1:50,000 topographic maps. Although the area of study does not contain any clear or sharp features, which made the point identification a formidable and Inaccurate task, the results are encouraging. Accuracies of about 80 meter in Easting and Northing coordinates and 120 meter in height (RMS) are achieved. Accuracy better than that by about 20 to 40% is achieved for relative positions.