geodesy line icons and signs. geodetics, surveying, cartography, earth, measuring, topography, gravity, reference

geodesy geodetics surveying cartography earth measuring topography gravity reference frames mapping ellipsoid coordinates triangulation navigation plate tectonic hydrography oblate spheroid orthometric datum periapsis parallax parallactic isocentric deflection projection geoid excentricity arcseconds divisions elliptic grid polygons planes precision orthogonality zenith azimuth astronomy orbit orbiter icon vector line