[GRLUG] OT, but GPS, anyone?

[Michael Mol]

On Wed, Aug 26, 2009 at 12:48 PM, Bob Kline<bob.kline at gmail.com> wrote:
> Positional differences sort of cancel
> anyway.  It's not clear than any errors
> between two units are 180 degrees out
> of phase.
>
> Surveyors know a thing or two about
> using GPS for very accurate measurements.
> They usually put up a reference position,
> and it becomes more accurate the more
> GPS readings they take.  Accuracy of
> millimeters is achived.
>
> Maybe look up how they do things.  Then
> ponder the difference between accuracy
> and precision....

http://www.ngs.noaa.gov/CORS/Articles/

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:wq