The sky view factor (SVF) is a key indicator in urban structures and is used in research in various fields. Recently, a method was developed to compute SVF in complex urban areas using airborne light detection and ranging (LiDAR). However, it displays low accuracy in areas with trees and ...
Rapid calculation of Terin parameters for radiation Modeling from digital elevation data IEEE Trans. Geosci. Remote Sens., 280 (5) (1990), pp. 963-969, 10.1109/36.58986 0. ISSN 15580644 http://ieeexplore.ieee.org/document/58986/ View in ScopusGoogle Scholar Gál et al., 2007 T. Gál, ...
Therefore, the Sky View Factor for a given point is given by: Rsvf=1Nfuses∑k=1Nfusesr−sinβkr As we intend to obtain a sky view factor, the radius r can be replaced by any positive number greater than zero. Rsvf=1Nfuses∑k=1Nfuses1−sinβk For a discrete calculation, it is...
So, I think using "geometry way" to approximate Sky View Factor is not correct. Sky View Factor calculation shall be based on the first principle defining the concept: radiation exchange between urban surface and sky hemisphere: (image extracted from Johnson, G. T., & Watson, 1984) Therefore...
Enhancing 3DSkyView extension performance - A multi-observer determination of sky view factorssky view factorurban geometryGIS extensionurban heat islandThis paper presents a second version of the 3DSkyView extension. The purpose of that extension was to implement a calculation algorithm for assessm...
The complicity and expensive nature of existing sky-view factor calculation techniques should mean that utilization of the outlined methodology will improve the accessibility of sky-view data for future climate studies. Copyright 2002 Royal Meteorological Society. 展开 ...
. It is based on the concept of view factor, sometimes called ‘form factor’ or ‘shape factor’ in the literature. The view factors are computed between the calculation point and numeric sky dome to obtain an estimate of the final SVF value. A special procedure is applied to take ...
In a vector-based method of SVF calculation with the rotation angle of 1掳, increasing length demonstrated no significant effect on SVF beyond a length-to-width ratio of 57.29, and the canyon could be quantitatively defined as infinitely long where the analytical method was applicable. Further...
If obstructions such as overhangs are present the sky long-wave incident on a surface is multiplied by the isotropic shading factor, Rdome, described above. The long-wave radiation from these obstructions is added to the long-wave radiation from the ground; in this calculation both obstruction...
[19]. A vector-based method of SVF calculation has the advantage of optimizing urban morphological parameters (UMPs) and urban canopy parameters (UCPs) affecting UHIs because most of these parameters, such as the plan area fraction, open space ratio, aspect ratio, and frontal area ratio, are...