Colorado geoid modeling at the US National Geodetic Survey
Colorado geoid modeling at the US National Geodetic Survey
复制标题
美国国家大地测量局的科罗拉多大地水准面建模
作者：
Y. M. Wang;Xiaopeng Li;K. Ahlgren;J. Krcmaric
美国国家大地测量局目前使用的大地水准面计算方法是基于Molodensky大地边值问题的解析向下延拓解。首先在1′ × 1′网格下计算全区似大地水准面，然后在简单布格异常的基础上加入大地水准面-似大地水准面分离项，得到大地水准面。测试了数据组合和地形/重力减少的一些变化，并为科罗拉多实验选择了三个模型。历史GPS/水准测量数据在计算中用作指导。对于初始运行、第一次和第二次迭代的模型，历史GPS/水准测量数据和大地水准面模型之间的大地水准面差异的标准差分别为5.2、5.0和4.9 cm。在将模型提交给科罗拉多实验后，使用GSVS 17（Geoid Slope Validation Survey 2017）GPS/水准测量数据对其进行了验证。223个GSVS 17标记的大地水准面差的标准差在三次运行中分别为3.2、2.6和2.3 cm。除了（准）大地水准面模型外，还计算了223 GSVS 17标记处的地球位数，并提交给科罗拉多大地水准面计算实验，并在Sánchez等人（2020年本期）中进行了评估。
The geoid computation method currently used at the US National Geodetic Survey is based on the analytical downward continuation solution of the Molodensky geodetic boundary value problem. The quasigeoid is computed first in 1′ × 1′ grids for the whole area, and then, the geoid is obtained by adding the geoid–quasigeoid separation term based on the simple Bouguer anomalies. A few variations in data combination and topographic/gravity reductions are tested, and three models are selected for the Colorado experiment. Historical GPS/leveling data are used as a guide in the computations. The standard deviation of geoid differences between the historical GPS/leveling data and geoid models is 5.2, 5.0 and 4.9 cm for the models of the initial run, the first and second iteration, respectively. After the models were submitted to the Colorado experiment, they were validated using the GSVS17 (Geoid Slope Validation Survey 2017) GPS/leveling data. The standard deviation of the geoid differences on 223 GSVS17 marks is 3.2, 2.6 and 2.3 cm for the three runs, respectively. In addition to the (quasi)geoid models, the geopotential numbers at 223 GSVS17 marks are also computed and submitted to the Colorado geoid computation experiment and it is evaluated in Sánchez et al. (2020 this issue).
影响因子：
4.4
作者：
Flury, Jakob;Rummel, Reiner
通讯作者：
Rummel, Reiner