Issues about satellite images georeferencing in Argentina
Argerich, Analia Isabel
Geometric corrections are intended to minimize or eliminate the distortions that are present in the geometry of satellite images. Some distortions are minimized by reception stations, which offer different levels of correction. The correction process can be approached by two different levels; by adjusting the image to a map or to another image already corrected, or by correcting the systematic distortions according to the orbital parameters of the satellite. It has been recognized that the adjustment of an image to a map or to another image already corrected, is more rigorous. This adjustment is called georeferencing and it consists of a process of change of space of reference. The conception of a reference system responds to a mathematical approach which has made it possible to establish models, parameters, and constants according to which, different coordinate systems derive. The reference frame derives from putting the reference system into practice, materializing networks of points on the land and determining its coordinates through a process that responds to the adopted model and that basically consists of integral design of the network, boundary points, measurement, calculation, and compensation. The reference system which gives place to the reference frame, implies then, the consideration of the Earth as an ellipsoid - mathematical model that sets the parameters of the ellipsoid and establishes relationships between ellipsoid and geoid -, the definition of a projection system of the ellipsoid for its representation on the drawing - model intended to present the minimum deformations - and the definition of a system of plane coordinates associated to the projection.
Event: XXIII International FIG Congress : Shaping the change
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