- Rutgers, The State University of New Jersey United States
- Alma Mater Studiorum University of Bologna Italy
- Delft University of Technology Netherlands
- Wuhan University China (People's Republic of)
- TU Wien Austria
- Sungkyunkwan University Korea (Republic of)
- Argonne National Laboratory United States
- French National Centre for Scientific Research France
- Chinese Academy of Sciences China (People's Republic of)
- United States Department of Agriculture United States
- University of Zaragoza Spain
- Finnish Meteorological Institute Finland
- Lund University Sweden
- University of Technology Malaysia Malaysia
- Université Paris Diderot France
- University of Twente Netherlands
- Invertis University India
- University of California, Berkeley United States
- Russian Academy of Sciences Russian Federation
- Helmholtz Association of German Research Centres Germany
- National Oceanic and Atmospheric Administration United States
- Research Institute for Geo-Hydrological Protection Italy
- University of California System United States
- Institut de Recherche pour le Développement France
- National Academies of Sciences, Engineering, and Medicine United States
- University of Graz Austria
- Chengdu University of Information Technology China (People's Republic of)
- University of Dundee United Kingdom
- KU Leuven Belgium
- Ludwig-Maximilians-Universität München Germany
- Tsinghua University China (People's Republic of)
- University of Arizona United States
- University of Copenhagen Denmark
- University of Colorado Boulder United States
- National and Kapodistrian University of Athens Greece
- University of Copenhagen Denmark
- University of Chile Chile
- Forschungszentrum Jülich Germany
- Agricultural Research Service United States
- National Research Council Italy
- Agriculture and Agriculture-Food Canada Canada
- European Space Agency France
- University of Salamanca Spain
- University of Perugia Italy
- Norwegian Water Resources and Energy Directorate Norway
- Spanish National Research Council Spain
In 2009, the International Soil Moisture Network (ISMN) was initiated as a community effort, funded by the European Space Agency, to serve as a centralised data hosting facility for globally available in situ soil moisture measurements (Dorigo et al., 2011b, a). The ISMN brings together in situ soil moisture measurements collected and freely shared by a multitude of organisations, harmonises them in terms of units and sampling rates, applies advanced quality control, and stores them in a database. Users can freely retrieve the data from this database through an online web portal (https://ismn.earth/en/, last access: 28 October 2021). Meanwhile, the ISMN has evolved into the primary in situ soil moisture reference database worldwide, as evidenced by more than 3000 active users and over 1000 scientific publications referencing the data sets provided by the network. As of July 2021, the ISMN now contains the data of 71 networks and 2842 stations located all over the globe, with a time period spanning from 1952 to the present. The number of networks and stations covered by the ISMN is still growing, and approximately 70 % of the data sets contained in the database continue to be updated on a regular or irregular basis. The main scope of this paper is to inform readers about the evolution of the ISMN over the past decade, including a description of network and data set updates and quality control procedures. A comprehensive review of the existing literature making use of ISMN data is also provided in order to identify current limitations in functionality and data usage and to shape priorities for the next decade of operations of this unique community-based data repository.