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 ...
Large scale high quality sky view factor calculationHigh Performance Proprietary HPC (High Performance Computing) technology Supports huge datasets (hundreds of gigabytes) 60X faster than state-of-the-art competing alternatives Out-of-core algorithm High Quality Large scale very high resolution DEMs ...
The sky view factor (SVF) has an important role in the analysis of the urban micro-climate. A new vector-based SVF calculation tool was implemented in a free and open source Geographic Information System named OrbisGIS. Its accuracy and computational performance are compared to the ones of an...
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...
. 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 this section, we elaborate on the individual calculation subprocesses involved in the TCM. 3.1. Transmittance and sky view factor We estimate transmittance by combining semantic segmentation and binarization of panoramic imagery. As shown in Fig. 3, the workflow consists of three main steps: (...
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...
Computes an estimation of the sky view factor on each pixel on a ground surface. Ability to set pixel number and detail level of the sky dome. Installation: Drop the file into the GH canvas or into the grasshopper UserObjects folder
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...
Here we present a simplified and yet accurate model for the direct calculation of the annual irradiation and energy yield of photovoltaic systems in urban environments. Our model is based on the correlation between the solar radiation components and the shape of the skyline profile. We show how ...