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The use of keys The process of image interpretation can be facilitated through the
use of image interpretation keys. Key are also valuable training aids
for novice interpreters and can also provide useful reference or refresher
materials for more experienced interpreters. The key helps to evaluate
the information presented on aerial images in an organised and consistent
manner. It gives guidance on the correct identification of features
or conditions on images. Normally a key will consist of two basic parts
(1) a collection of annotated or captioned images, preferably stereopairs,
illustrative of the features or conditions to be identified and (2)
a graphic or word description of the image recognition characteristics
for the features or conditions observed. There are two general types
of image interpretation keys differentiated by the method of presentation
of diagnostic features and these are a Selective
key and an Elimination key.
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