The criteria for identification of an object with interpretation elements is called an interpretation key. The image interpretation depends on the interpretation keys which an experienced interpreter has established from prior knowledge and the study of the current images. Generally, standardized keys must be established to eliminate the differences between different interpreters.
The eight interpretation elements (size, shape, shadow, tone, color, texture, pattern and associated relationship), as well as the time the photograph is taken, season, film type and photo-scale should be carefully considered when developing interpretation keys. Keys usually include both a written and image component.
Table 7.5.1 shows an example of interpretation keys for forestry mapping which have been standardized by the Japan Association for Forestry.
The keys are specified with respect to the crown's shape, rim shape of the crown, tone, shadow, projected tree shape, pattern, texture and other factors.
Table 7.5.2 shows an example of an interpretation key for land cover mapping with Landsat MSS images in the case of single band and false color images.
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