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A customizable framework for computing sky view factor from large-scale 3D city models.

Authors :
Liang, Jianming
Gong, Jianhua
Sun, Jun
Liu, Jin
Source :
Energy & Buildings. Aug2017, Vol. 149, p38-44. 7p.
Publication Year :
2017

Abstract

A common approach to derive the sky view factor (SVF) in an urban environment is to combine urban morphological modeling and computational geometry techniques. Computational methods and tools have been developed to derive SVF from digital surface models (DSMs) and small-scale three dimensional (3D) city models, but they are not well suited for accommodating large-scale 3D city models. In this paper, we present a computational framework (SVFEngine) for deriving SVF from a wide variety of 3D city models, including the recently developed oblique airborne photogrammetry-based 3D city model (OAP3D), which is a highly detailed representation of an urban environment. We compared the SVF estimates computed from a large-scale high-resolution OAP3D with those from a set of street view panoramas at 30 locations. The comparison shows that the SVF estimates obtained using both methods closely match each other with a correlation coefficient of 0.99. The result suggests that high-resolution 3D city models have the potential for deriving accurate SVF estimates. Several examples are presented to show how SVFEngine can be applied in urban environmental modeling and analysis. The source code of SVFEngine is freely available ( https://github.com/ljm355/SVFEngine ) so it can be fully integrated into a user-defined workflow. [ABSTRACT FROM AUTHOR]

Details

Language :
English
ISSN :
03787788
Volume :
149
Database :
Academic Search Index
Journal :
Energy & Buildings
Publication Type :
Academic Journal
Accession number :
124140689
Full Text :
https://doi.org/10.1016/j.enbuild.2017.05.024