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1 August 2002 Equations for potential annual direct incident radiation and heat load
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Abstract

Estimation of potential annual direct incident radiation has traditionally required numerical integration with simulation models. As an alternative, we present convenient equations for use in spreadsheet, GIS, and database applications. Input variables are latitude, slope, and aspect. The equations apply to 0–60°north latitude, slopes from 0–90°, and all aspects. By transforming aspect, the equations can also be applied as an index of heat load, symmetrical about a northeast to southwest axis.

Bruce McCune and Dylan Keon "Equations for potential annual direct incident radiation and heat load," Journal of Vegetation Science 13(4), 603-606, (1 August 2002). https://doi.org/10.1658/1100-9233(2002)013[0603:EFPADI]2.0.CO;2
Received: 17 October 2001; Accepted: 4 July 2002; Published: 1 August 2002
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