Generalised Linear Perspective: Treated with Special Reference to Photographic Land Surveying and Military Reconnaissance

Abstract

DURING recent years much attention has been paid to air-photography as a means of surveying; the present developments of the subject being chiefly due to the varied experience which was gained in the War. The method is still on its trial. There are certain conditions under which it promises to be successful, but no peace-time surveys of any importance have yet been carried out on this system. It is likely to be found of valuein flat countries, and for maps on medium scales. Air-photo surveys havebeen suggested for the mapping of deltas, such as those of the Ganges, the Niger, and the Irrawaddy, and for the surveys of large native towns. The suggestion, made a few years ago, to map a hilly West Indian island in this way, was, probably wisely, “turned down.”

Generalised Linear Perspective: Treated with Special Reference to Photographic Land Surveying and Military Reconnaissance.

By J. W. Gordon. Pp. xvi + 184. (London, Bombay and Sydney: Constable and Co., Ltd., 1922.) 21s, net.