| http://www.w3.org/ns/prov#value | - when it is required to monitor positional drifts of an identified point, the drift being caused e.g. by progressive changes in a natural contour, for instance due to earthquakes, ground compaction, erosion etc, or in a man made structure, for instance in the case of stress-induced distortions in a dam or bridge, sinking foundations in a building, etc.
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