The CASM geoid based on spectral combination approach for the Colorado Experiment: ColSCA-CASM2019

The International Service for the Geoid (ISG) was founded in 1992 (as International Geoid Service - IGeS) and it is now an official service of the International Association of Geodesy (IAG), under the umbrella of the International Gravity Field Service (IGFS). The main activities of ISG consist in collecting, analysing and redistributing local and regional geoid models, as well as organizing international schools on the geoid determination (Reguzzoni et al., 2021).国际大地水准面服务（International Service for the Geoid, ISG）于1992年成立，成立之初名为国际大地水准面服务（International Geoid Service, IGeS），如今它是国际大地测量协会（International Association of Geodesy, IAG）的官方下属服务机构，隶属于国际重力场服务（International Gravity Field Service, IGFS）。该机构的主要工作包括收集、分析并重新分发局地与区域大地水准面模型，同时组织有关大地水准面确定的国际专题讲习班（Reguzzoni等，2021）。