Geodesy & Me
Mathematical shape of the Earth
What is an ellipsoid?
NAVD88
What is the North American Vertical Datum of 1988?
The number of GPS segments
What is 3?
the 3 segments of GPS
What are the Control, Space, and User segments?
the mass center of the earth
What is the origin of NAD83 and/or WGS84?
Equipotential gravity surface used as a reference for NAVD88
What is the geoid?
NSRS
What is The National Spatial Reference System?
The minimum number of control marks required for every project
What is 3?
the surface used to reference GPS derived heights
What is the ellipsoid
Mean Sea Level at 26 tide stations in North America
What is NGVD29?
Native reference datum of GPS
What is WGS84?
GNSS
What is Global Navigation Satellite System?
years in a solar cycle
What is 11?
carrier phase positioning is more accurate than code phase positioning because of this
What is the carrier wavelengths are shorter?
the 19yr average of the lowest of the 2 low tides
What is Mean Lower Low Water?
The reference ellipsoid for NAD83
What is GRS80?
WGS84
What is the World Geodetic System of 1984?
The minimum number of satellites required for a 3-D position
What is 4?
the Dilution Of Precision is a function of this
What is Satellite Geometry?
Meades Ranch, KS
What is the origin of the North American Datum of 1927?
In the formula h=N-H, N is obtained from this?
What is a geoid model?
OPUS
What is the On-Line Positioning User's Service?
the number of times a GPS satellite orbits the earth daily
What is 2?
the major source of error in GPS that is not eliminated/reduced by differential/relative positioning techniques
What is multi-path?
Father's Point/Point Rimouski
What is the origin of the North American Vertical Datum of 1988?