[OZAPRS] Distance/bearing calculations

[Richter, Mike W]

Dave

If you are limiting it to 100km or so then use UTM because it is a
rectangular grid system. Distance and bearing are plain geometry.

xxxyyy is a simplification of UTM where you only need 100m accuracy. Full
13 digit UTM (from a GPS) gives you 1 metre resolution.

Mike VK2BMM

-----Original Message-----
From: Dave Horsfall [mailto:dave at horsfall.org]
Sent: Sunday, 29 August 2004 12:38 PM
To: APRS in Oz
Subject: [OZAPRS] Distance/bearing calculations


I'm looking for algorithms to convert between UTM/D.M.S/etc, and to
calculate distance and bearing between any arbitrary pair.  If it matters,
assume WGS-84 and the Greater Sydney area.  It's for entry into a
spreadsheet (OpenOffice), so Wintendo binaries and Javascript etc are no
good.

Also, what's the "best" way to store position information?  The usual
XXXYYY grid reference is a little too coarse, as you can be 100m out, and
GPS easily beats that these days.  I'm guessing DDD.ddd for ease of
calculation?  Translating that to D.M.S is just base-60 arithmetic, but it
would be cool to convert from/to UTM, and Maidenhead...

-- Dave
_______________________________________________
ozaprs mailing list
ozaprs at marconi.ics.mq.edu.au
http://marconi.ics.mq.edu.au/cgi-bin/mailman/listinfo/ozaprs
_______________________________________________
ozaprs mailing list
ozaprs at marconi.ics.mq.edu.au
http://marconi.ics.mq.edu.au/cgi-bin/mailman/listinfo/ozaprs