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High Precision Geoid Models HKGEOID-2000 for Hong Kong and SZGEOID-2000 for Shenzhen, China.
- Source :
- Marine Geodesy; Apr-Jun2005, Vol. 28 Issue 2, p191-200, 10p
- Publication Year :
- 2005
-
Abstract
- High precision geoid models HKGEOID-2000 for Hong Kong and SZGEOID-2000 for Shenzhen, China, have been developed with a hybrid approach of so-called sequential processing, using high precision GPS/leveling data, land and sea gravity anomalies, and digital terrain models. These two local geoid models have the same 1-km resolution. The estimated accuracy (external accuracy) is better than 1.7 cm for HKGEOID-2000 and 1.4 cm for SZGEOID-2000. Some common areas are covered by HKGEOID-2000 and SZGEOID-2000. So these two geoid models, along with high quality GPS/leveling data collected on the overlapping areas, can be used to detect the systematic bias between HKGEOID-2000 and SZGEOID-2000, as well as the difference between Hong Kong Principal Datum and 1956 yellow sea height datum of China, yielding RMS errors of 1.011 m and 1,003 m, respectively. Moreover, HKGEOID-2000, along with GPS ellipsoidal heights, is employed to determine the errors of the “orthometric heights” from purely trigonometric heighting, yielding an RMS error of 0.102 m. The combination of SZGEOID-2000 and GPS ellipsoidal heights has been used to replace the traditional spirit leveling and mapping, called GPS mapping. [ABSTRACT FROM AUTHOR]
- Subjects :
- SHAPE of the earth
MARINE geodesy
GLOBAL Positioning System
Subjects
Details
- Language :
- English
- ISSN :
- 01490419
- Volume :
- 28
- Issue :
- 2
- Database :
- Complementary Index
- Journal :
- Marine Geodesy
- Publication Type :
- Academic Journal
- Accession number :
- 17552469
- Full Text :
- https://doi.org/10.1080/01490410590953758