Field Definitions are Available Here
Collection
varstring(255)
Mandatory if applicable
Identification given to established representation of the Earth's shape.
Geodetic Reference System 1980 (GRS80)
SemiMajorAxis, DenominatorofFlatteningRatio
Geodetic Reference System 1980 (GRS80)
Must be used with SemiMajorAxis, DenominatorofFlatteningRatio.
METADATA > COLLECTIONMETADATA > Spatial > CoordinateSystemContainer > HorizontalCoordinateSystemContainer > GeodeticModel.EllipsoidName
/gmi:MI_Metadata/gmd:referenceSystemInfo/gmd:MD_ReferenceSystem/gmd:referenceSystemIdentifier/gmd:RS_Identifier/gmd:code
Also relevant: CS_EllipsoidalCS and CD_Ellipsoid
Spatial Information