Photo‐interpretation and Topographic Mapping

Abstract

The role of photo‐interpretation in topographic map production is examined in an attempt to show how this phase of the work influences the total procedure. The advantages of a separate photo‐interpretation phase are explained.

Instrumental Requirements for Modern Map Revision

“…A certain amount of search time and thinking time will be necessary on the part of the operator, when no obvious production will take place. A similar situation arises in new mapping where the relative merits of having the operator perform the photo-interpretation during plotting against having a separate photointerpretation phase, when no expensive equipment but only a simple mirror stereoscope is required, have often been discussed and are well understood (Tait, 1970). Also, careful point marking is known to speed up aerial triangulation observational procedures; a well plotted and checked plotting sheet will greatly increase the chances of a speedy absolute orientation.…”