Description: The use of digital object identifiers (DOI) for scientific data and scientific software is increasingly common practice for more than a decade. As a result of the Coalition on Publishing Data in the Earth and Space Sciences (COPDESS) and other initiatives, DOI-referenced datasets are fully citable in scholarly literature and more and more journals require the availability of data underlying scientific results and their citation. Technical implementations, like Scholix (a framework for Scholarly Link Exchange) enable direct links and between literature and data and support the visibility of research data. Key elements for enabling these links are persistent identifier (PID). These PIDs allow, e.g., to uniquely identify data, scholarly literature and code (via DOIs), persons (via ORCID), institutions and funding agencies (via ROR – the registry of research organizations), via machine-actionable links and should be included in the DOI metadata. Similar to other scientific disciplines, the use of DOI for geodetic data is increasing in the last years. While this is easy for static data, like for global of regional gravitational models or GNSS campaign data, most geodetic data are large (mainly due to the large number of files and high temporal resolution) and highly dynamic (real time data acquisition) and highly granular. Geodetic services of the International Association for Geodesy (IAG) are international key player for geodetic data provision and distribution and their operating institutions and funding agencies increasingly require the provision of tangible data use and access statistics. Credit through citation was a major reason for the Global Geodetic Observing System (GGOS) to establish a Working Group on using DOI for geodetic data sets (GGOS DOI WG) and for the working group members. The GGOS DOI WG was established in 2019 and includes international representatives of IAG Services and geodetic data centres and associated members that aims at developing best practices and recommendations for the consistent implementation of DOIs across all IAG Services and in the greater geodetic community. This presentation will give an update on recent group activities and on the status of DOI minting for geodetic datasets across IAG Services.

Description: 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.