Functions for calculating: (1) shadow height, (2) logical shadow flag, (3) shadow footprint, (4) Sky View Factor and (5) radiation load. Basic required inputs include a polygonal layer of obstacle outlines along with their heights (i.e. "extruded polygons"), sun azimuth and sun elevation. The package also provides functions for related preliminary calculations: breaking polygons into line segments, determining azimuth of line segments, shifting segments by azimuth and distance, constructing the footprint of a lineofsight between an observer and the sun, and creating a 3D grid covering the surface area of extruded polygons.
Package details 


Author  Michael Dorman [aut, cre], Evyatar Erell [ctb], Itai Kloog [ctb], Adi Vulkan [ctb] 
Maintainer  Michael Dorman <dorman@post.bgu.ac.il> 
License  MIT + file LICENSE 
Version  0.6.4.1 
URL  https://github.com/michaeldorman/shadow/ 
Package repository  View on CRAN 
Installation 
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