Geodetic or geospatial data are composed of point, lines and area relations. These data are rich with attributes. As in many other sciences, geodetic problems are located in a real world.
The concept – the problem need to be modeled.
The Solution – have to be put in a geometrical and physical formulation by mathematical means
The purpose is either description or explanation and allow to
i) estimate non-observable state and
ii) predict future state
Typical types of models in geodesy are:-
i) Measurement model (observation model)
ii) Geodetic model (theoretical model)
Both models are connected via the geodetic observable.
The task of measurement – to correct and evaluate the raw observation (true observation) to adapt them to the geodetic model