Researchers review methods for sky view factor estimation

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The sky view factor (SVF) is a geometric concept that refers to the ratio of the radiation received by a planar surface to the radiation emitted by the entire hemispheric environment. These dimensionless values are used to quantify the proportion of the visible sky or open canyon space in urban street canyons. SVF is a key factor affecting urban surface heat balance, micro-scale air circulation, and diffusion of atmospheric pollutants. There are various methods for estimating SVF. To date, however, no study systematically summarized the estimation principles, accuracy, calculation efficiency, and application scope of these methods. 

In view of this, Miao Chunping and Chen Wei from the urban ecology research group at the Institute of Applied Ecology (IAE) of the Chinese Academy of Sciences compared methods used for SVF estimation at different…

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