Ellipsoid Parameters
Ellipsoid Parameters
- Ellipsoid parameters:
- semi-major axes (a), semi-minor axes (b)
- e = sqrt(a2- b2)/a = flattening
- N = normal length =
- Great circles and meridians
- Two main ellipsoids:
- Clarke ellipsoid of 1866, on which NAD27 is based
- Geodetic Reference System of 1980 (GRS80): on which NAD83 is based.
- For lines up to 50 km, a sphere of equal volume can be used
Notes:
3