The Mexican gravimetric geoid: GGM10
收藏资源简介：
GGM10 is a gravimetric geoid model for Mexico computed by the General Direction of Geography and Environment at the INEGI. It covers the region from 14° to 33° in latitudes and from 86° to 119° in west longitude, with a grid resolution of 2.5 arc-minutes. It is based on gravity data collected from 1970 up to June 2010. A remore-restore procedure is implemented by using the EIGEN-GRACE02S satellite-only global geopotential model for the long wavelengths of the field and the Continuo de Elevaciones Mexicano as the main digital terrain elevation model. The geoid determination is based on the Stokes-Helmert technique with the software provided by the University of New Brunswick (UNB). The resulting GGM10 model is referred to the GRS80 reference ellipsoid in the ITRF2008 frame (epoch 2010.0). Its estimated absolute accuracy in geoidal height values is 20 cm. The geoid model is provided in ISG format 2.0 (ISG Format Specifications), while the file in its original data format is available at the model ISG webpage.
GGM10是一款面向墨西哥的重力大地水准面模型（gravimetric geoid model），由墨西哥国家统计地理信息局（INEGI）下属的地理与环境总局研发。 该模型的覆盖范围为纬度14°至33°、西经86°至119°，网格分辨率达2.5角分。 其数据基础为1970年至2010年6月收集的重力观测数据，解算过程采用移除-恢复（remove-restore）技术：针对重力场的长波分量，使用EIGEN-GRACE02S纯卫星全球重力位模型；地形高程基准则以墨西哥连续高程模型（Continuo de Elevaciones Mexicano）作为核心数字地形高程模型（digital terrain elevation model）。 大地水准面解算采用斯托克斯-赫姆特（Stokes-Helmert）技术，并使用了新不伦瑞克大学（University of New Brunswick, UNB）提供的专用解算软件。 最终产出的GGM10模型基于ITRF2008参考框架下的GRS80参考椭球（GRS80 reference ellipsoid），解算历元为2010.0。经估算，该模型的大地水准面高绝对精度为20厘米。 该大地水准面模型以ISG格式2.0（ISG Format Specifications）提供，原始数据格式的文件可在该模型的ISG官方网页获取。
