The later-prehistoric linear ditches that divide the chalk landscape of Wessex, south England, are markers in an area. It is a topographic space. The ditches seem to be placed with a view to their visibility in the landscape. It is a human topographic space. A GIS study of the ditches' place, in terms of what a human sees in moving acros undulating ground, goes beyond that environmental determinism which underlies many GIS studies.
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Marcos Llobera (1996) studied this question.
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