Shade calculation model (Heat Overlay)
Revision as of 09:35, 20 September 2019 by Frank@tygron.nl (talk | contribs)
Whether a cell is in the shade or not is an important factor the Heat Overlay. The notion that a cell is shaded or not determined which PET function is used; PETsun or PETshade, night. In the model described by DPRA Heat stress report, cells can be shaded by buildings, terrain and foliage.
The shade is dependent on the location of the sun. This in turn is dependent on the date and the time of day and the world location of the project.
Since each timeframe result of a Heat Overlay is related to a particular date and time of day, each time frame will have a related sun altitude and sun azimuth angle.. These angles are calculated automatically based on the world location of your project and the date of the timeframe.
