G.P.S. Applications in Support of the Georgia Environmental Protection Division's Drinking Water Program
Date
1995-04Author
Rogers, Lewis F.
Semerjian, Christopher J.
Vick, Donald A.
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Show full item recordAbstract
Resource grade GPS receivers are being used
to determine the positional indices for wells and associated
potential pollution sources for public wells in Georgia. This
study was conducted to evaluate the accuracy and precision
of the applied technology and techniques. Sixty differentially-
corrected GPS positions were calculated at a 1st order
monument located 257 miles from the GPS Base Station.
The horizontal mean radial error for these tests was 7.8 ft.
The RMSE was 9.6 ft. and 98% of all calculated positions
fell within 19.2 ft. of the true positions. Elevation errors
were about 1.5 times greater than those for horizontal
positions. These tests were conducted under ideal conditions.
Traditional surveying is used to determine bearing and
distances between wells and associated potential pollution
sources. A bearing/distance is then shot to a GPS location
that is clear of obstruction. The Geographic Calculator is
then used to translate distances and bearing from station to
station for positional indices. This technique maximizes the
accuracy of both horizontal and vertical positional data.
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