Height increments were converted into geopotential number increments and later calculated into conventional normal height values.
Geopotential numbers are used for determining the differences in surveyed geometric heights and "gravimetrically corrected" normal heights.
With 3.143 m local normal height, the geopotential number
in the top of Phanxipang Mountain in Vietnam is measured as: [[bar.W].sub.0] - [W.sub.PXP] = 30 746.17749 [m.sup.2] * [s.sup.-2], the accepted condition (10) leads to an error of 4 mm in global normal height (9).
Research interests: gravity field and measurements, height system and geopotential number, adjustment of geodetic network, quasi-geoids modelling, geodetic works in civil aviation.
Research interests: terrestrial laser scanning, height system and geopotential number, adjustment of geodetic network.
The bases of all physical height systems are geopotential numbers
. These are determined based on the height differences and the data on gravitational acceleration.