Monday 22 August 2005

G4

PM0027
A Proposal for global height datum unification
Ardalan, Alireza¹
1 University Of Tehran, Department of Surveying and Geomatics Eng., Iran
Author email: ardalan@ut.ac.ir
An ellipsoidal Boundary Value Problem (BVP) based on observables of the types terrestrial, satellite, and airborne gravimetry, satellite altimetry, astronomical latitude and astronomical longitude is solved. By using this BVP, solved for every country separately, gravity potential value of the zero point of all national height systems can be computed. The zero point of the national height datum can be realized by precise GPS observations at the reference benchmark of the country. The difference between computed gravity potential value of the zero point of the country and geoid's potential can be regarded as a means for global height datum unification.

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