[aprssig] Re: Calculating HAAT(was lots of big towers?etc)
jfkraus3 at cox.net
Tue Dec 14 14:12:42 CST 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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