Hello,
Everyone should bookmark this, or atleast download it.................
The best piece of work I have found is the *Aviation Fomulary* by Ed
Williams
www.best.com/~williams/index.html
In the first part click the link for *Aviation Formulary* in html or the
link to download the text version.
If Mr.Casio [calculator] gives you trouble this may be a bit deep, but he
does cover Pathagum's theory, and even has examples of how far you would
miss Los Angles when leaving New York by several of the different formulas
[Rhumb Line, Great Circle....etc].
There is even conversion factors for Ellipsoids:
Name Major axis, a (km) Flattening (f)
WGS84 6378.13700 1/298.257223563
GRS80/NAD83 6378.13700 1/298.257222101
WGS66 6378.145 1/298.25
GRS67/IAU68 6378.16000 1/298.2472
WGS72 6378.135 1/298.26
Krasovsky 6378.245 1/298.3
Clarke66/NAD27 6378.2064 1/294.9786982138
Trey Pattillo
[EMAIL PROTECTED]
http://www.wap3.com
----- Original Message -----
From: Bob Young - www.bydesignwales.demon.co.uk
<[EMAIL PROTECTED]>
To: <[EMAIL PROTECTED]>
Sent: Thursday, 11 May, 2000 06:23
Subject: MI Accurate distances around the world
> Dear List
>
> This is a general GIS question rather than MI specific.
>
> Does anybody know where I can find a formula for measuring the distance
> from one long, lat to another long, lat anywhere in the world?
>
> I am not worried about the complexity of the formula. I am more
> concerned about the accuracy of the answers obtainable from the formula.
>
> ALSO:-
>
> Does anybody have any experiences ( good or bad ) on the accuracy of the
> answers from MapInfo Professional on distance measurement? Does anybody
> know the method employed within MI Pro?
>
> Thanks,
>
>
> Bob Young
> www.mapsbydesign.co.uk
>
>
>
> --
> Bob Young - www.bydesignwales.demon.co.uk
> ----------------------------------------------------------------------
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