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

Chein-way Hwang*, Y. S. Hsiao

*Corresponding author for this work

研究成果: Article同行評審

28 引文 斯高帕斯(Scopus)

摘要

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.

原文English
頁(從 - 到)279-291
頁數13
期刊Journal of Geodesy
77
發行號5-6
DOIs
出版狀態Published - 1 八月 2003

指紋 深入研究「Orthometric corrections from leveling, gravity, density and elevation data: A case study in Taiwan」主題。共同形成了獨特的指紋。

引用此