Geodesy in India

Geodesy and connectivity in lattices

This paper generalizes the notion of symmetrical neighbourhoods, which have been used to define connectivity in the case of sets, to the wider framework of complete lattices having a sup-generating family. Two versions (weak and strong) of the notion of a symmetrical dilation are introduced, and they are applied to the generation of “connected components” from the so-called “geodesic dilations”...

New Vertical Geodesy

Vertical geodesy is undergoing a revolution because of two factors. First, new precise three-dimensional position measurement techniques used over very long distances and based on extraterrestrial reference systems provide a new class and precision of geometric data previously unavailable for geophysical investigations. Second, physical models in tectonic theory for large earthquakes predict cr...

Reference Systems in Satellite Geodesy

GEODESY The Concept

The following second definition represents a more up-to-date description of geodesy given by the Committee on Geodesy of the U. S. National Academy of Sciences in 1978. • Establishment and maintenance of national and global three dimensional geodetic networks • Measurement and analyses of geodynamic phenomena (earth rotation, earth tides, crustal movements, etc.) • Determination of the earth's ...

Ambiguities in a Problem in Planar Geodesy

This is a study of a problem in geodesy with methods from complex algebraic geometry: for a fixed number of measure points and target points at unknown position in the Euclidean plane, we study the problem of determining their relative position when the viewing angles between target points seen from measure points are known. In particular, we determine all situations in which there is more than...