geopotential number

geopotential number

[¦jē·ō·pə′ten·chəl ′nəm·bər]
(geophysics)
The numerical value C that is assigned to a given geopotential surface when expressed in geopotential units (1 gpu = 1 meter × 1 kilogal).
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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.
As described above, to determine the effect of the gravity field gradient along a levelling profile to the levelling results, the height increments measured need to be converted into geopotential numbers, if necessary, adjusted and later converted to conventional normal height values.
143 m local normal height, the geopotential number in the top of Phanxipang Mountain in Vietnam is measured as: [[bar.
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.
Normal heights of border benchmarks Point code Geopotential number Normal height Standard deviation kgal x mm m kgal x mm 26V10238 11.
Geopotential numbers are determined in GRS 80 normal field, applying the new European gravity system and evaluating non-linearity of GRS 80 normal field equipotential surfaces (Moritz 1988).
To obtain the height of points given in metres, the geopotential number has to be divided by gravitational acceleration.
The unit of geopotential numbers is also called GPU (geopotential unit) where 1 GPU = 1 kgalm = 10 Nm/kg = 10 [m.