BEWARE the law of cosines, which is grossly inaccurate for minimal deltas.
IF the distance is a few miles (or more) AND you're using a good COS
algorithm, AND double precision variables - then OK.
Sorry - I'm a mathematician/computer scientist and GIS nerd. I can also
supply documentation tomorrow.
Mark
-----Original Message-----
From: Anker Berg-Sonne [mailto:[EMAIL PROTECTED]]
Sent: Wednesday, February 06, 2002 6:15 PM
To: Ben Diss; [EMAIL PROTECTED]
Subject: Re: [RCSE] Lat/Lon calculations
Ben,
I have the formul;a at work. I'll try to remember to post it
tomorrow.
Remind me of I forget. It involves a bunch of cosines!
Anker
----- Original Message -----
From: "Ben Diss" <[EMAIL PROTECTED]>
To: <[EMAIL PROTECTED]>
Sent: Wednesday, February 06, 2002 8:03 PM
Subject: [RCSE] Lat/Lon calculations
> I picked up one of those nifty little GSP units that
records a track.
I've collected some data (lat/lon/alt/datetime) and now want
to play with
the numbers. I'm not a math wiz, so I'm stumped on step 1.
How do I
calculate the distance between two lat/lon points? Any
formula would be
helpful, but a link to some kind of tutorial would be most
appreciated.
>
> Thanks.
>
> -Ben
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