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The grey-green divide:multi-temporal analysis of greenness across 10,000 urban centres derived from the Global Human Settlement Layer(GHSL)

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International Journal of Digital Earth 2020年第1期13卷 101-118页

作者： Christina Corbane Pesaresi Martino Politis Panagiotis Florczyk J.Aneta Melchiorri Michele Freire Sergio Schiavina Marcello Ehrlich Daniele Naumann Gustavo Kemper Thomas European Commission Joint Research Centre(JRC)Directorate for SpaceSecurity&MigrationIspraVAItaly Arhs Developments S.A. LuxembourgLuxembourg Piksel S.r.l MilanoItaly

The presence of green spaces within city centres has been recognized as a valuable component of the city *** provides a variety of benefits including energy saving,improved air quality,reduced noise pollution,decreased ambient temperature and psychological *** also shows that the amount of vegetation,known as‘greenness’,in densely populated areas,can also be an indicator of the relative wealth of a ***‘grey-green divide’,the contrast between built-up areas with a dominant grey colour and green spaces,is taken as a proxy indicator of sustainable management of cities and planning of urban *** and continuous assessment of greenness in cities is therefore essential for monitoring progress towards the United Nations Sustainable Development Goal *** availability of multi-temporal greenness information from Landsat data archives together with data derived from the city centres database of the Global Human Settlement Layer(GHSL)initiative,offers a unique perspective to quantify and analyse changes in greenness across 10,323 urban centres all around the *** this research,we assess differences between greenness within and outside the built-up area for all the urban centres described by the city centres database of the *** also analyse changes in the amount of green space over time considering changes in the built-up areas in the periods 1990,2000 and *** results show an overall trend of increased greenness between 1990 and 2014 in most *** effect of greening is observed also for most of the 32 world *** conclude that using simple yet effective approaches exploiting open and free global data it is possible to provide quantitative information on the greenness of cities and its changes over *** information is of direct interest for urban planners and decision-makers to mitigate urban related environmental and social impacts.

关键词： Global human settlement layer greenness Landsat data records degree of urbanization urban centres built-up areas sustainable development goal 11

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