These slides provide an overview of the expert survey held in advance of the H2020 Water-ForCE workshop: In situ calibration and validation of satellite products of water quality and hydrology which was held as three virtual meeting sessions on 17, 18 and 20th May 2021: Data availability, Accessibility and quality gaps Emerging technologies to address current gaps Data harmonization and sharing Source data have been removed from the graphs included in these slides but may be requested from the authors. The workshop and outcomes are part of the H2020 funded project Water-ForCE: Water Scenarios For Copernicus Exploitation. This project has received funding from the European Union’s Horizon 2020 research and innovation programme under grant agreement No 101004186