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Abstract:
The International Service for the Geoid (ISG), hosted by Politecnico di Milano in Italy, is an official service of the International Association of Geodesy (IAG). Its activities are coordinated by the International Gravity Field Service (IGFS) and are related to the IAG Commission 2 on Gravity Field. The ISG provides access to a comprehensive repository of geoid models through its website, most of them with an open access. In this archive, the latest releases of the most important and well-known geoid models, as well as less recent or less known models are available. In this work, the current status of the repository is described and the ad-hoc developed web-services for its exploitation are presented. All the models contained in the repository are indexed by WoS Data Citation Index. Moreover, under author request, the models can be labelled with a Digital Object Identifier (DOI) assigned to univocally identify data files and to improve interoperability and reusability. This service is currently running in cooperation with GFZ Data Services. To allow a direct access to all the publicly available models, three web-services are developed. The first one performs height conversions, and it is an updated version of the existing service. The second one is dedicated to file format conversion and sub-model extraction, improving interoperability and allowing an easier usage of the distributed models by commercial GNSS receivers and software. Finally, the last service is devised to merge different geoid models by removing discontinuities at borders and thus unifying their height reference system.
