The gravimetric quasi-geoid of São Paulo State: QGEOID-SP-2020-GGM250

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，最初以国际大地水准面服务（International Geoid Service, IGeS）的名称运作，如今已是国际大地测量协会（International Association of Geodesy, IAG）的官方服务机构，隶属于国际重力场服务（International Gravity Field Service, IGFS）。其主要工作包括收集、分析并重新分发局域与区域大地水准面模型，同时主办大地水准面测定相关的国际讲习班（Reguzzoni等，2021）。