Between Green and Grey: Towards a New Green Volume Indicator for Cities
نویسندگان
چکیده
Trees in urban settings have vast and documented benefits for city dwellers. We propose that to represent city green the green volume should be taken into account, instead of surface or number of trees. In addition, green volume should be seen in relation to the built “grey” volume to account for dilution or misrepresentation effects. This paper is a first contribution to develop tree-to-building volume indicators that can be used to measure and compare the greenness of cities or neighbourhoods and integrate spatial quality indicators. Our indicator is presented as a proportion between volume of trees and buildings, within geographic units. Tree volume was calculated from an existing 3D tree model derived from highly detailed light detection and ranging (LiDAR) data, while grey volume was determined from LiDAR point cloud combined with detailed building footprints. The indicator presents expected and meaningful results when tested against distance to city centre and land use types.
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