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Urban, dryland, and polar systems
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Uploaded on Tuesday 21 Feb 2012 by GRID-Arendal

Urban, dryland, and polar systems

Year: 2007 Author: Philippe Rekacewicz, Emmanuelle Bournay, UNEP/GRID-Arendal
Description:
Urban systems are built environments with a high human density. For mapping purposes, the MA uses known human settlements with a population of 5,000 or more, with boundaries delineated by observing persistent night-time lights or by inferring areal extent in the cases where such observations are absent.
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