Physical geodesy 201.(thegpsobserver)(Column)

Point of Beginning | October 1, 2007| | Copyright

The previous article in this series, "Physical Geodesy 101," (POB August 2007) described the methods of collecting gravity measurements.

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In this article I will describe how the geoid can be determined from gravity measurements only. It's a complicated process, but easy to describe. The final product is the determination of the geoid height, N.

Let's begin this discussion by showing how surveyors today can determine geoid heights from GPS observations on established bench marks. Figure 1 shows a section of the Earth, the ...

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