Updating topographic mapping in Great Britain using imagery from high-resolution satellite sensors

Topographic mapping from remotely sensed imagery is carried out all over the world, using data from an ever-growing number of sensors. Traditional film cameras are gradually being replaced by digital cameras and scanners, but most topographic mapping still relies on sensors based on airborne platforms. This paper examines the potential of high resolution satellite sensor imagery for the updating of topographic mapping, from the perspective of a national mapping agency. After a review of satellites capable of being used for this purpose, several examples of mapping projects are presented. The paper ends with a look to the future, and asks whether satellite imagery can ever replace airborne (digital or analogue) photography for the makers of maps. It is concluded that high resolution satellite sensor imagery does have a role to play in the update of topographic mapping, especially in the detection of change.