Abstract
Abstract Perhaps the most important requirement in any air survey is that the ground surveyed points used as a basis for controlling the photography should be correctly identified on the photographs. In the writer's experience more difficulties and delays have been caused by misidentifications of these points in the field than perhaps from any other cause, and yet very little has been written on this important subject, and there are no generally recognised methods of point identification. In this article a system of point identification is described which the writer has used with success in certain types of country, and it is hoped that the article may lead to more contributions on the subject.
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