摘要
北美以及加拿大、墨西哥和美国的重力数据库进行了两项重大修改:采用国际上接受的地球椭球面,而不是习惯使用的大地水准面或海平面作为重力测点的高程基准面;改进重力异常的计算方法。对北美国家现在使用的高度校正、布格校正、地形(海洋深度)校正、间接影响校正、曲率校正、大气校正,以及均衡补偿校正,均做了不同程度的修改。
The North America gravity database as well as database from Canada, Mexico and the United States are being revised, and the revision includes the following two items ： the use of the internationally accepted terrestrial ellipsoid for the height datum of gravity stations rather than the conventionally used geoid or sea level, and the modification of procedures for calculating gravity anomalies, including corrections for theoretical gravity, atmospheric effect, height effect, Bouguer effect, indirect effect, terrain and bathymetry effect, and isostatic compensation effect.
出处
《物探与化探》
CAS
CSCD
2008年第1期8-12,共5页
Geophysical and Geochemical Exploration
关键词
高程基准面
重力异常
计算方法
北美
vertical datum
gravity anomaly
calculation method
North America
