Urban, dryland, and polar systems
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.
For any form of publication, please include the link to this page:
This photo has been graciously provided to be used in the GRID-Arendal resources library by: Philippe Rekacewicz, Emmanuelle Bournay, UNEP/GRID-Arendal
Urban, dryland, and polar systems
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.
For any form of publication, please include the link to this page:
This photo has been graciously provided to be used in the GRID-Arendal resources library by: Philippe Rekacewicz, Emmanuelle Bournay, UNEP/GRID-Arendal