A platform for research: civil engineering, architecture and urbanism
A platform for research: civil engineering, architecture and urbanism
The offset of the South Korean vertical datum from a global geoid
Abstract Accurate orthometric heights in a national vertical datum can be determined economically using GPS heights and gravimetrically computed geoid undulations. If this national vertical datum should be tied to a global geoid, then both the datum offset as well as the difference between the GPS ellipsoid and the globally best-fitting ellipsoid should be known. This paper elaborates on the theory and procedures to obtain the datum offset for South Korea’s national vertical datum on the basis of the global model, EGM08. Among several GPS/leveling data sets slightly different estimates are obtained, with the estimate, 26.5 +/− 1.3 cm (above the global zero-tide geoid) obtained using over 800 data points distributed in South Korea. The uncertainty is a level of precision, not absolute accuracy, and the discrepancies between estimates using different subsets of the data indicate the presence of small unsolvable biases among them. An alternative procedure to determine orthometric heights using the modern principles is also proposed that makes the vertical datum completely independent of the global geoid in the traditional way and obviates the estimation of these offsets.
The offset of the South Korean vertical datum from a global geoid
Abstract Accurate orthometric heights in a national vertical datum can be determined economically using GPS heights and gravimetrically computed geoid undulations. If this national vertical datum should be tied to a global geoid, then both the datum offset as well as the difference between the GPS ellipsoid and the globally best-fitting ellipsoid should be known. This paper elaborates on the theory and procedures to obtain the datum offset for South Korea’s national vertical datum on the basis of the global model, EGM08. Among several GPS/leveling data sets slightly different estimates are obtained, with the estimate, 26.5 +/− 1.3 cm (above the global zero-tide geoid) obtained using over 800 data points distributed in South Korea. The uncertainty is a level of precision, not absolute accuracy, and the discrepancies between estimates using different subsets of the data indicate the presence of small unsolvable biases among them. An alternative procedure to determine orthometric heights using the modern principles is also proposed that makes the vertical datum completely independent of the global geoid in the traditional way and obviates the estimation of these offsets.
The offset of the South Korean vertical datum from a global geoid
Jekeli, Christopher (author) / Yang, Hyo Jin (author) / Kwon, Jay Hyoun (author)
KSCE Journal of Civil Engineering ; 16 ; 816-821
2012-06-29
6 pages
Article (Journal)
Electronic Resource
English
The offset of the South Korean vertical datum from a global geoid
| Online Contents | 2012
A Gravimetric Geoid Model as a Vertical Datum in Canada
| Online Contents | 2006
| Online Contents | 2019
Geoid, Sea Level and Vertical Datum of the Artic -- Improved by ICESat and GRACE
| Online Contents | 2008