Determination of the Earth’s gravity field and geopotential value is one fundamental topics in physical geodesy. Traditional terrestrial precise leveling measurements can be used to determine values at a local or regional scale. However, recent developments optical atomic clocks have not only rapidly improved science but also contributed applied research. The latest generation approaching accur...

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...