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591Re: [tracker2] PLC logic

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  • Wes johnston
    Jun 3, 2006
      Perhaps defining multiple orthogonal areas?  A 2 point line suits me ... or a parallelagram... If you look at the coast of SC, it runs approx 45 degrees to the north and east.  A orthogonal box just isn't gunna catch my balloon before it hits water.
      ----- Original Message -----
      From: scott@...
      Sent: Saturday, June 03, 2006 2:49 PM
      Subject: RE: [tracker2] PLC logic

      Actually, for rectangular areas that are orthogonal to the coordinate plane,
      there's not much processing involved.  Each GPS coordinate is already
      converted to a 32-bit integer format,  so it's just a matter of seeing if
      your coordinate pair falls between two corners.  And that only has to be
      done every second or two, when a new position comes in.

      I'll probably do that eventually as part of the scripting system.  I plan to
      set aside one page of flash (512 bytes) for script code, so you could fit a
      number of geofence checks in there.


      > -----Original Message-----
      > From: tracker2@yahoogroups.com
      > [mailto:tracker2@yahoogroups.com] On Behalf Of
      > juha.nurmela@...
      > Sent: Saturday, June 03, 2006 11:32 AM
      > To: tracker2@yahoogroups.com
      > Subject: RE: [tracker2] PLC logic
      > The "geofences" might have a use as report triggers (or blockers!);
      > circling closed garages and any other black holes. Little
      > reward from lots
      > of cpu cycles, but, again, just a thought.
      > Juha OH5NXO
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