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A second global-level evaluation of human activity (Hannah et al.,. 1994) mapped relatively undisturbed (not simply roadless) natural areas, and reduced the minimum size of mapped 'undisturbed' areas to 100,000 ha. It defined undisturbed and two classes of non-natural areas as follows:

A greater concern, particularly in the latter two studies, is that the analyses are not explicitly scaled; nor are they systematic and repeatable. This means that the precision of the mapping and the accuracy of attribute class allocations are not transparent and direct expressions of the data and the analytical procedure. It also means that they can not form the basis for any kind of consistent assessment programme to monitor change through time.

An Effective Spatial Model: Basic Requirements

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