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I'm wondering if there have been any studies which attempt to analyze or characterize GPS error distribution over different situations/conditions (e.g. surrounded by tall buildings/mountains, precipitation/clouds/fog, rural areas, etc.) to understand how these errors may change as compared to 'perfect' conditions.

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The general term for this is "Multi-path Error", which can be described as what happens when a GPS signal bounces on it's way to the receiver from the satellite instead of a direct line of sight.

http://scholar.google.com/scholar?q=GPS+multipath+error&hl=en&as_sdt=0&as_vis=1&oi=scholart&sa=X&ei=ma9dT5fVLeKWiAKpz-2sCw&ved=0CB0QgQMwAA

Lighter reading is available in the top results from the following search: http://www.google.com/search?btnG=1&pws=0&q=GPS+multipath+error

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