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[aprssig] Re: Calculating HAAT(was lots of big towers?etc)

John Kraus jfkraus3 at cox.net
Tue Dec 14 20:12:42 UTC 2004


At 11:38 AM 12/14/2004, -Jason kg4wsv wrote:

>On a topographic map, plot concentric circles centered on your tower 
>location.  Draw lines radiating outward from your tower location at 0, 45, 
>90, 135, 180, 225, 270, and 315 degrees (every 45 degrees starting at 
>0).  Everywhere a circle and radial line intersect, add the elevation of 
>that point (total of 40 points).  Divide this total by 40; this is the 
>average ground level.

How far out are the circles? 1ft 1mi 100mi?  It will affect the calculation. 





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