WGS84 Geoidal Separation
Separation (metres) = height of WGS84 geoid minus height of WGS84 ellipsoid
Separation data loaded incrementally
SRM_STAT_CODE_MISSING_WGS84_GEOID_SEPARATION_FILE
SRM_GetWGS84GeoidalSeparation
const SRM_GD_Coordinate_2D * WGS84GeodeticLocation_ptr,
SRM_Long_Float * GeoidalSeparation_ptr