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GPH 492/692. GPS/Survey Team Results Spring 2010 (to support gravity survey). Jay Goldfarb Courtney Murphy Garry Richardson Jason Henderson. Summary of Methods. Trigonometric leveling (total station) for upper Hidden Valley gravity points (with one GPS elevation)

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Gph 492 692

GPH 492/692

GPS/Survey Team Results

Spring 2010

(to support gravity survey)

Jay Goldfarb

Courtney Murphy

Garry Richardson

Jason Henderson


Summary of methods
Summary of Methods

  • Trigonometric leveling (total station) for upper Hidden Valley gravity points (with one GPS elevation)

  • Mapping-grade GPS (Trimble ProXH) on remainder of Hidden Valley, Prater Way, and City of Sparks gravity reference points


Gph 492 692

Maps produced using .kml files imported into Google Earth


Survey results
Survey Results

  • Estimated horizontal accuracies are between 10 cm – 10 m (upper Hidden Valley points), due to different grades of GPS used for location.

  • Estimated vertical accuracy ranges from 10 cm to 75 cm, depending primarily on time of day of GPS data collection. (poor GDOP in afternoon)

  • (all estimates at 68% confidence level)


Effect of horizontal position error on gravity estimation
Effect of Horizontal Position Error on Gravity Estimation

Effect of 30 m error in latitude on normal gravity calculation:


Effect of elevation error on gravity calculation
Effect of elevation error on gravity calculation

-> a 20 cm elevation error results in 0.04 mGal error

-> a 75 cm elevation error results in 0.15 mGal error


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