The aim of the  International SST FRM Radiometer Network is to develop a community of in situ radiometer builders, operators and data users who will:

  • Promote good practice in the construction and operation of in situ radiometers
  • Agree and establish protocols, formats and standards for quality assurance of data
  • Provide a single access point for the collection and dissemination of radiometer data
  • Support satellite radiometer operators in the long-term validation of satellite products
  • Share knowledge and coordinate activities between Network members
  • Inform the wider community about the Network's activities


Why are shipborne infrared radiometers important?

  • They are used to validate satellite measurements of skin SST, which is what satellite infrared SST measurements measure
  • They provide traceability of measurements to NMI standards (FRM4STS)
  • In the absence of a dual-view satellite sensor, they provide the reference skin SST (fiducial reference measurement)
  • They are needed for the Gap-Bridging between AATSR and SLSTR  
  • As more shipborne radiometers join the ISFRN, the current limited global coverage will be improved


The objectives for the ships4SST project are:

  • OBJ-1: Validate Sentinel-3A and Sentinel-3B SLSTR L1, L2 and higher order SST products to FRM standards.
  • OBJ-2: Maintain and deploy on a continuous basis Thermal Infrared Radiometers (TIR) FRM and necessary supporting instrumentation to validate Sentinel-3 SLSTR SST products.
  • OBJ-3: Process, archive and quality control all data following documented FRM procedures that approve their use for FRM satellite validation.  
  • OBJ-4: Deliver approved data sets and uncertainty budgets to Copernicus and the Sentinel-3 Mission Performance Centre.
  • OBJ-5: Collaborate with appropriate International Scientists and Agencies using TIR for satellite validation as an International SST FRM Radiometer Network.
  • OBJ-6: Prepare and submit peer-reviewed journal articles.
  • OBJ-7: Conduct communications and outreach material promoting Copernicus Sentinel-3 SLSTR and the SLSTR-SST-FRM-Validation project.


For instrument operation timeliness and compatibility with the service objectives, the attached spreadsheet is updated with the latest relevant information.