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== Signal Definition == The {{SignalTerm|type=DS|id=DS-00051|label=Impervious surface area}} Damage Signal is derived from the Observable Type 'Impervious surface area' (OT-094). It quantifies the total area of land surface covered by impervious materials within a defined geographic unit, expressed in square kilometers (kmΒ²). This signal represents a DRIVER condition within the Anthropogenic-Throughput domain, indicating human-induced land cover modification associated with urbanization and infrastructure development. The temporal resolution is annual, enabling the assessment of yearly changes in impervious surface extent.
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