NDLI: Orthometric corrections from leveling, gravity, density and elevation data: a case study in Taiwan

Content Provider	Springer Nature Link
Author	Hwang, C. Hsiao, Y. S.
Copyright Year	2003
Abstract	A new orthometric correction (OC) formula is presented and tested with various mean gravity reduction methods using leveling, gravity, elevation, and density data. For mean gravity computations, the Helmert method, a modified Helmert method with variable density and gravity anomaly gradient, and a modified Mader method were used. An improved method of terrain correction computation based on Gaussian quadrature is used in the modified Mader method. These methods produce different results and yield OCs that are greater than 10 cm between adjacent benchmarks (separated by ∼2 km) at elevations over 3000 m. Applying OC reduces misclosures at closed leveling circuits and improves the results of leveling network adjustments. Variable density yields variation of OC at millimeter level everywhere, while gravity anomaly gradient introduces variation of OC of greater than 10 cm at higher elevations, suggesting that these quantities must be considered in OC. The modified Mader method is recommended for computing OC.
Starting Page	279
Ending Page	291
Page Count	13
File Format	PDF
ISSN	09497714
Journal	Journal of Geodesy
Volume Number	77
Issue Number	5-6
e-ISSN	14321394
Language	English
Publisher	Springer-Verlag
Publisher Date	2003-01-01
Publisher Place	Berlin, Heidelberg
Access Restriction	One Nation One Subscription (ONOS)
Subject Keyword	Gravity anomaly gradient - Geoid - Orthometic correction - Mean gravity - Terrain correction
Content Type	Text
Resource Type	Article
Subject	Geophysics Geochemistry and Petrology Computers in Earth Sciences

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