[R-sig-eco] angular statistics

[Jari Oksanen]

If you use these, remember that R cos() needs argument in radians.

Cheers, Jari Oksanen

Sent from my iPad

> On 18.10.2013, at 8.40, "Ivailo" <ubuntero.9161 at gmail.com> wrote:
> 
>> On Fri, Oct 18, 2013 at 6:16 AM, Michael Marsh <swamp at blarg.net> wrote:
>> 
>> If you want a measure of exposure, i. e., heat, I suggest using the "heatload" transformation suggested by McCune and Grace (2002). Their assumption is that mid-afternoon, when the sun is in the southwest, is usually the warmest time of day. The formula at the end of Chapter 3 follows:
>> 
>> heat load index=(1-cos(degrees-45))/2
>> 
>> McCune, Bruce and James B. Grace. 2002. Analysis of ecological communities. MJM Software Design. Gleneden Beach, Oregon. USA
> 
> Thanks for the interesting discussion!
> 
> I'd like to add that although I don't have the book, I found the
> radiation measures presented in the following paper:
> McCune, B. and D. Keon. 2002. Equations for potential annual direct
> incident radiation and heat load. Journal of Vegetation Science
> 13:603–606.
> 
> Cheers,
> Ivailo
> -- 
> UBUNTU: a person is a person through other persons.
> 
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