Hi

The “simple” answer is that the weird legs going out from the central blob are
the result of multi-path / reflections in the received signal. With enough data 
you
might be able to correlate them to observed obstructions. The simulation 
modeling 
required to make that happen might be a bit complex…..

Bob

> On Jan 7, 2017, at 3:07 PM, Gary E. Miller <g...@rellim.com> wrote:
> 
> Yo Peter!
> 
> On Sat, 7 Jan 2017 12:54:45 -0500
> Peter Reilley <preilley_...@comcast.net> wrote:
> 
>> This is the survey from my Trimble NTBW50AA.   It looks like some 
>> bacteria floating around.
> 
> You can get those from any GPS using the program gpsprof from gpsd.
> 
> See attached for a 24 plot from a stationary GlobalSat MR-350P
> 
> I find these plots very useful when comparing GPS models.
> 
> RGDS
> GARY
> ---------------------------------------------------------------------------
> Gary E. Miller Rellim 109 NW Wilmington Ave., Suite E, Bend, OR 97703
>       g...@rellim.com  Tel:+1 541 382 8588
> 
>           Veritas liberabit vos. -- Quid est veritas?
>    "If you can’t measure it, you can’t improve it." - Lord Kelvin
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