Techniques and costs of mapping forest plantation extensions

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Abstract
Theory, practical aspects and costs relating to vertical aerial photography with 70 mm and 35 mm cameras are described, with particular reference to their application in updating maps of plantations where they are used for recording local forest changes such as those caused by new roads and clearings. These methods supplement major aerial surveys used for preparing accurate base maps and interpretation of extensive areas. They also provide a means of testing new photographic techniques. The techniques are simple, quick and cheap and are proving very effective in an expanding number of applications. The photographs can be interpreted stereoscopically, and detail can be transferred to maps by use of a Zeiss Sketchmaster. The 70 mm system has an internally mounted camera and a drift sight, whereas the major 35 mm system uses an externally mounted camera and flight lines are oriented with the wind to minimise drift.

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