What is the difference between WGS 84 and GRS 80?
ParameterNotation Units GRS80WGS84 Semimajor axisa m63781376378137 Angular velocityw rad/s7292115E-117292115E-11 Gravitational Const. GMm^3/s^2986005E83986005E8 Dynamic form Factor unnormalized formJ2 108263E-8 normalized form C2,0 -484.16685E-6 Semiminor axis bm6356752.31416356752.3142 Eccentricity squarede^2 0.006694380022900.00669437999013 Flattening f0.00335281068118 0.00335281066474 Reciprocal flatteningf^-1298.257222101 298.257223563 Polar radius of curvcm6399593.6259 6399593.6258 Not much difference! Ref: North American Datum of 1983 NOAA Professional Paper NOS 2 Charles R. Schwarz, Editor U.S. Department of Commerce by:Sam Wormley swormley@cnde.iastate.edu 3/7/97 1.4 How do I convert between NAD83 and WGS 84? I think the proposition of doing a “datum shift” between NAD83 and WGS84 is a waste of time. The difference between the two is the philosophy of how an inertial datum should be defined, and is ignored by all but a handful of geodesists that are working at extraordinary lev
