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In the CWEX11 S directory at EOL is a file of Splus code, latlonalt.q, for computing averages of the GPS values of latitude, longitude and altitude.

I ran it on 6 days of data from Jul 9 11:15 to Jul 15 16:00 (arbitrary period), and it returned the following:

stn

Lat(deg)

Lat stddev(deg)

Lon(deg)

Lon stddev(deg)

Alt(m)

Alt stdev(m)

1

42.06605

1.101896e-05

-93.28521

9.501855e-06

338.998

1.798216

2

42.06977

1.317406e-05

-93.28515

1.091214e-05

340.4294

1.796624

3

42.07344

1.417124e-05

-93.28522

1.358779e-05

340.0666

1.977678

4

42.07679

1.39572e-05

-93.28523

1.211881e-05

341.577

2.024058

Note that the altitude estimates have a std deviation of around 2 meters

Here's a kml file: cwex_ncar.kml with the above positions.

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