1 - Limited scientific description of the measurement methodology available 2 - Comprehensive scientific description of the measurement methodology, report on limited validation, and limited measurement series user guide 3 - Score 2 + paper on methodology published; Validation report available from data collector or in grey literature; comprehensive user guidance is available 4 - Score 4 + comprehensive scientific description available from data provider; report on inter comparison available; paper on validation published; user guide available from data provider includes details of validation and characterisation 5 - Score 4 + comprehensive scientific description maintained by data provider; report on data assessment results exists; user guide is regularly updated with updates on product and validation; description on practical implementation is available from data provider 6 - Score 5 + journal papers on product updates are and more comprehensive validation and validation of quantitative uncertainty estimates are published; operations concept regularly updated 1 - None 2 - Limited steps taken towards assuring traceability and comparability; limited information exists on systematic and random measurement uncertainties 3 - Score 2 + limited traceabaility and comparability assured; comprehensive documentation on measurement uncertainties present and methods for routine quality monitoring defined 4 - Score 3 + steps required to establish traceability are defined; (inter)comparison against corresponding measurements in organised campaigns available; quantitative estimates of uncertainty available and routine monitoring partially implemented 5 - Score 4 + traceability partly established; measurements regularly compared to a measurement of similar or greater traceability; systematic uncertainties removed and uncertainty estimates are partially traceable; routine quality monitoring fully implemented 6 - Score 5 + traceability established; measurements are regularly compared to other traceable measurements to verify; comprehensive validation of the quantitative uncertainty estimates that are fully traceable; routine monitoring in place with results noted in meta data or documentation 1 - Restricted availability through request 2 - Data avaliable from originator 3 - Data and documentation publically available from originator, feedback collated, irregular updates, initial versioning and local archival 4 - Data and documentation available through a recognised data portal; feedback mechanism considers published analyses; version control formalized, rocbust archival on multiple media 5 - Source data, code and metadata archived and available upon request; established feedback mechanism; regular update cycle; fully established version control; data archival at recognized national or international long-term repository 6 - Score 5 + no data access restrictions; active consideration of user feedback; data available in initial version for near-real time applications; all versions retained, indexed and available through a recognised repository 1 - None 2 - Benefit for research applications identified; Potential public and commercial opportunities identified