Unit: metre
Data source: EPSG
Information source: US National Snow and Ice Data Center
Revision date: 2006-09-22
Remarks: Used in US DMSP SSM/I microwave sensor processing software. Semi-minor axis derived from eccentricity=0.081816153. Semi-major axis (a) sometimes given as 3443.992nm which OGP suspects is a derived approximation. OGP conversion assumes 1nm=1852m exactly.