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=GPS Satellite Analysis=
I calculated the theoretical GPS error for each point using the agi.com C# library. I followed their cookbook for [http://www.agi.com/resources/help/online/AGIComponents/Programmer%27s Guide/Overview/Navigation Accuracy/AccuracyAnalysisSetup.html GPS Accuracy Analysis], which consists of:
# Create a constellation of satellites using AGI's SEM formatted almanac.
# Modify the constellation based on AGI's outage data.
# Configure a GPS receiver model.
## Set Elevation Angle Constraint to between 5 and 40 degrees.
## Set the latitude/longitude to that recorded by the point.
## I set the receiver to have 12 channels, which is the norm for a GPS watch.
# Evaluate the recorded GPS accuracy, Dilution of Precision and the number of satellites in view.
=Sources of Error=
There are a number of possible sources of error.
