Abstract
Geokinematics in GGOS - Different Relations and Dependences The paper presents the preliminary results of the analysis of fundamental dependencies between different geodetic concepts related to the one of the GGOS (Global Geodetic Observation System) pillars called Geometry and Kinematics. These relationships are described using UML (Unified Modelling Language) - one of the graphical notations that can be used for information modelling. Concepts are represented as classes with their names, attributes, and different kinds of links between them. The main purpose of this paper is to introduce the full description of connections between all GGOS components.
Highlights
Geodesy is the science of determining the geometry, gravity field, and rotation of the Earth
GGOS stands for Global Geodetic Observing System and it was established by the International Association of Geodesy (IAG) in July 2003
Geometry and kinematics refer to the determination of object positions and their change in time
Summary
Geometry and kinematics refer to the determination of object positions and their change in time (movement). Using geopotential models (determined by means of different satellite techniques) or plumb line declination, the geoid undulations can be derived (Fig. 5) They join the ellipsoid as a geometrical surface (Geokinematics pillar) and the geoid – surface of the constant potential value (Gravity Field pillar). As an example of many mutual relations between pillar components GRS’80 (Global Reference System 1980) can be given (Czarnecki, 1997) This system is based on the geocentric equipotential ellipsoid defined using four standard values of the Earth: equatorial radius a, geocentric, gravitational constant GM, angular velocity ω and dynamical factor of shape J2, which describe normal potential on the Earth’s surface and determine all other geometric and dynamical values. Equation (1) enables geometrical flattening determination using only geodynamical values, so it joins all three GGOS segments’ elements:
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