GPS CONTROLLED AERIAL PHOTOGRAMMETRY

Increased efficiency in establishing geodetic control required for top ographic mapping is promised by a merger of aerial photogrammetry and the NAVSTAR Global Positioning System (GPS). The purpose of this paper to discuss the concept of GPS-controlled aerial photogrammetry, its t heoretical basis, and some results obtained to date. Horizontal accura cies better than 0.04 metres RMS without use of ground control have be en demonstrated by GPS-controlled aerial photogrammetry. The paper con cludes with a discussion of the problems, particularly for large scale mapping operations, that must be addressed to assure an orderly trans ition of this new technology into practice.