cartesian-geodetic-systems.svg (165.35 kB)

# Sketch of three coordinate systems: Geocentric Cartesian, Geocentric Geodetic, and Topocentric Cartesian

figure

posted on 2021-07-23, 16:02 authored by Vanderlei C. Oliveira Jr.Vanderlei C. Oliveira Jr., Leonardo UiedaLeonardo Uieda, Valeria C. F. BarbosaValeria C. F. BarbosaA sketch of three common coordinate system used to describe observations on the Earth, in particular in the field of gravimetry.

Geocentric Cartesian System: Z-axis coincides with the mean rotational axis of the Earth, the X-axis points to the Greenwich meridian, and the Y -axis completes a right-handed system.

Geocentric Geodetic System: Defined by a reference ellipsoid. The position of a point is defined by the geometric height h, the geodetic latitude φ, and the longitude λ.

Topocentric Cartesian System: Has an origin at a point P, axes x and y are parallel to the unit vectors v and w, respectively, and the z-axis is opposite to the unit vector u.

The figure was generated with the open-source software Inkscape, which can be used to export it to other formats (like PDF or PNG).