Hi,

download LatLon.Zip from

http://www.geocities.com/mklotz.geo/

MX



----- Original Message -----
From: "Elkin Gonzalez" <elkin.enigma@gmail.com>
To: <piclist@mit.edu>
Sent: Monday, September 26, 2005 11:05 AM
Subject: GPS Positioning System


> I've been looking for the equation for finding the distance between two
> cities, given the latitude and longitude of both cities. For example: what
> is the formula one would use to find the distance between San Francisco
> (N37 37' 00" latitude, W122 22' 00" longitude) and Paris (N48 44' 00"
> latitude, E02 23' 00" longitude.)
>
>
>
> The equation to implement is:
>
>   A = LAT1, B = LONG1
>   C = LAT2, D = LONG2 (all converted to radians: degree/57.29577951)
>
>   IF A = C AND B = D THEN DISTANCE = 0;
>   ELSE
>
>   IF [SIN(A)SIN(C)+COS(A)COS(C)COS(B-D)] > 1 THEN DISTANCE =
>   3963.1*ARCOS[1]; /* solved a prob I ran into.  I haven't fully
>   analyzed it yet */
>   ELSE
>
>   DISTANCE=3963.1*ARCOS[SIN(A)SIN(C)+COS(A)COS(C)COS(B-D)];
>
> I'm trying to write a program for the 18F452 PIC micro that will
> include this distance
> calculation in it.
>
> Any help that members of "The PIC List" can offer would be greatly
> appreciated.
>
>
>
> Elkin Dario Gonzalez Sierra
> Bogota (COLOMBIA)
>
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