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14491Re: [GPSL] M0XER-4

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  • James Ewen
    Aug 21, 2014
      On Thu, Aug 21, 2014 at 10:09 PM, powellite52 powellite52@...
      [GPSL] <GPSL-noreply@yahoogroups.com> wrote:

      > Thanks much for the link. aprs.fi shows the M0XER-4 path wrong.

      Well, it doesn't show the path "wrong". If you make the history long
      enough so you can see the flight path over Alaska, as well as today's
      path over Iceland, you'll get a straight line between the two, and
      this is only because the APRS-IS stream doesn't have any data between
      the two locations. aprs.fi therefore just connects the last known
      location over Alaska to the first known location over Iceland.

      In fact, there is compressed historical location information stored in
      the packets being copied. But only Leo has a script running which
      decodes the historic data and provides that data to spacenear.us. That
      site is configured to ingest the historic data and interleave it into
      the live APRS data.

      The regular APRS-IS stream has no provisions for historical
      information processing, and in fact it has a great deal of difficulty
      dealing with even short timeframe delayed packets entering the
      database.

      The spacenear.us website is a dedicated and highly honed specific
      purpose website, and it does it's job very well. I love the fact that
      these little payloads of Leo's can regale us with stories of their
      travels when they were out of range of the APRS network. We don't have
      to guess where they were... they tells us the tale of their travels.

      B-64 should be hitting the British Isles any time now! B-63 needs to
      stop hiding in the Pacific Ocean, and B-66 needs to head south a bit
      to get into range of the eastern Canadian APRS network.

      --
      James
      VE6SRV
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