HDWG Groundwater 2 IE

This groundwater interoperability experiment (GW2IE) developed and tested the GroundWater Markup Language 2, by harmonizing and advancing existing modeling initiatives such as: GWML1, relevant EU-INSPIRE models (Geology-hydrogeology, Environmental monitoring facilities), GeoSciML, and others. It produced an engineering report in preparation for movement to an OGC data specification subsequent to the GW2IE.

GWML2 is required for the standard transfer of groundwater feature data, including data about water wells, aquifers, and related entities. It is also intended as the encoding model for INSPIRE geology-hydrogeology data specification, and as a reference for observations associated with the features.


The OGC members that are acting as initiators of the Interoperability Experiment are:

  • Natural Resources Canada (NRCan)
  • US Geological Survey (USGS)
  • Commonwealth Scientific and Industrial Research Organisation (CSIRO)
  • European Commission (DG-JRC)

Contact information for these organizations is contained in an Annex.


The following organizations will be participating in the IE.

  • Geology Survey of Canada, Natural Resources of Canada (GSC)
  • US Geological Survey (USGS)
  • Commonwealth Scientific and Industrial Research Organization (CSIRO)
  • European Commission (DG-JRC)
  • University of Ballarat (UB)
  • Bureau de la Recherche Géologiques et Minières (BRGM)
  • British Geological Survey (BGS)
  • Geological Surveys of Germany (GSG)
  • Polish Association for Spatial Information (PASI).
  • Polish Geological Institute (PGI)
  • International Groundwater Resources Assessment Centre (IGRAC)
  • Salzburg University (Z_GIS)