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A Hyperspectral network for ocean colour validation

water (ocean, coastal, lakes). A Hyperspectral network for ocean colour validation. WATERHYPERNET. WC. HYPERNET-OC. by Kevin Ruddick, Royal Belgian Institute for Natural Sciences (RBINS). NEXT WEEK’S (S3VT) TITLE: An international network for validation

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A Hyperspectral network for ocean colour validation

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  1. water (ocean, coastal, lakes) A Hyperspectral network for ocean colour validation WATERHYPERNET WC HYPERNET-OC by Kevin Ruddick, Royal Belgian Institute for Natural Sciences (RBINS)

  2. NEXT WEEK’S (S3VT) TITLE: An international network for validation of water reflectance for all VIS/NIR spectral bands of Sentinel-3AB/OLCI And MODIS-TERRA And Landsat-8 And Sentinel-2AB And PACE And CHRIS-PROBA And Pléiades And all other ocean coloursensors And MODIS-AQUA And all future hyperspectral sensors (inc Sentinel-10) And VIIRS And SEVIRI And PROBA-V And all future optical nanosatellites (Planetscope, etc.)

  3. 10 years of MERIS validation data, including a few years of AERONET-OC… • AERONET-OC = main validation source for MERIS (and OLCI): • 1 image, 1 matchup • AND have standardised calibration, processing and Quality Control • BUT do not cover all wavelengths MERIS Rhow490 MERIS Rhow510 In situ Rhow490 In situ Rhow510 [MERIS 3rd reprocessing data validation report, ACRI, 2012] Data courtesy of PIs (D. McKee, K. Ruddick, D. Siegel, S. Kratzer) and AERONET-OC PIs (G. Zibordi, G. Schuster, S. Kratzer, B. Gibson), matchup using MERMAID

  4. Heritage: NASA/JRC AERONET-OC • Federated network of instrumented sites for ocean color validation, spawned from larger AERONET network • Built up from 1 site (2002) to 15 (2017) • Full details in [Zibordi et al, 2009] [aeronet.gsfc.nasa.gov]

  5. Multi-Mission Validation [Van der Zande, Ruddick et al. Validation of Landsat-8/OLI for ocean colour applications with AERONET-OC sites in Belgian coastal waters (2016) Ocean Optics, Victoria, BC] MAPE < 3%  12 bands 3% < MAPE < 5%  8 bands MAPE > 5%  36 bands Ocean Land

  6. e.g. “490nm” spectral band of MODIS, S3/OLCI … L8/OLI and S2/MSI (and AERONET-OC) Need hyperspectral to fit all these with low uncertainty S2 SRF updated Dec 2017 is a bit “squarer” ...

  7. From AERONET-OC to WATERHYPERNET NASA/AERONET-OC CIMEL SEAPRISM instrument 412-440-500-531-555-670-870-1020nm (5/19 S3/OLCI bands…) • WATERHYPERNET • TRIOS/RAMSES instrument • Hyperspectral 350-900nm • All bands, all sensors • No band-shift/widening errors

  8. Which instrument to use? (now) • TRIOS/RAMSES instrument: • Hyperspectral 350-900nm • Robust and mature (~100s in use since 2000) • Relatively low cost for high performance • Manufacturer provides support and details of communication protocol for own data acquisition development • Well-characterised: • Spectral Straylight [Talone et al, 2016] • Thermal sensitivity [Zibordi et al, 2017] • Cosine response [Mekaoui and Zibordi, 2013] • Polarisationsensitivity [Talone and Zibordi, 2016] • Non-linearity tests [Tartu Observatory, FRM4SOC project] • Portable “FieldCAL” LED light source for relative calibration monitoring

  9. Pointing system • Pointing system reduces cost (2 sensors instead of 3), provides “parking” protection ... and possibility to explore multi-angle zenith/azimuth pointing scenarios • System design (low power, low cost controller; python open source data acquisition) by VLIZ/RBINS in HYPERMAQ project: • Lab-testing now • First tests on offshore platform: summer 2018 • Belgian sites (2 coastal, 1 inland) to be running operationally: summer 2019 • International expansion: 2019-2020 [HYPERMAQ: LOV, IAFE, ...]

  10. Network concept Similar functionality to NASA/AERONET network

  11. A new hyperspectral radiometerintegrated in automated networksof water and land bidirectional reflectance measurementsfor validation of all VIS/NIR bands of all optical missions- The HYPERNETS Project Kevin Ruddick, Joel Kuusk, Vittorio Brando, Ana Dogliotti, David Doxaran, Nigel Fox, Daniel Spengler, DavideDionisi, Claudia Giardino, ClémenceGoyens, Francisco Grings, Luis Guanter, Edouard Leymarie, TiiaLillemaa, Christophe Penkerc'h, AnuReinart, RosaliaSantoleri, Karl Segl, DimitryVanderzande, Quinten Vanhellemont, RihoVendt 1. Royal Belgian Institute for Natural Sciences (RBINS), Brussels, Belgium 2. Tartu Observatory (TO), Tartu, Estonia 3. ConsiglioNazionaledelleRicerche (CNR), Rome, Italy 4. Instituto de Astronomía y Física del Espacio, Consejo Nacional de InvestigacionesCientíficas y Técnicas (IAFE, CONICET/UBA), Buenos Aires, Argentina 5. LaboratoireOcéanographique de Villefranche, Université Pierre et Marie Curie – Paris 6 (UPMC/LOV), Villefranche-sur-mer, France 6. National Physical Laboratory (NPL), Teddington, United Kingdom 7. Helmholtz Zentrum Potsdam DeustschesGeoforschungszentrum (GFZ), Potsdam, Germany 8 ConsiglioNazionaledelleRicerche (CNR-IREA), Milan, Italy The HYPERNETS Project is funded by the European Union under the H2020 Program

  12. Reduce cost Improve performance Reduce cost Add features Expand networks NETWORKS AERONET-OC/WATERHYPERNET RADCALNET (land) and links to TERENO (land) INSTRUMENT hyperspectral a) VIS/NIR b) SWIR radiance, irradiance imaging camera thermal control? polarising filter? SYSTEMS Pointing robot solar/wind power anti-theft/animal/biofouling rain/wind/wave protection heating/cooling? Calibration LED data transmission + turbidi/fluori/backscatter? web cam, sky cam? (land) flux tower, etc.?

  13. HYPERNETS Project Overview Spectral range and resolution? Azimuth/zenith pointing range and accuracy? Other instrument or system features?

  14. Timeline • WATERHYPERNET v1 (TRIOS/RAMSES) • Lab testing of pointing system, controller and data acquisition NOW • First tests at offshore platform: 2018/07 • 3 Belgian sites (2 coastal AERONET-OC + 1 inland) operational by 2019/07 • International expansion 2019-2020 • WATERHYPERNET v2 (new “HYPERNETS” instrument) • 2019/04, 2019/10, 2020/07: Prototype instruments • 2019/10, 2020/07, 2021/01: Systems for field testing • 2022/02: Commercialisation of instrument

  15. Questions? Suggestions? Comments? • What can you/IOCCG do to help? • Contribute to user needs for: • Instrument (spectral characteristics, etc.) • Data processing and distribution service (parameter corrections, download format, etc.) • Support new sites in 2019+ (but same instrument, pointing system and protocol, please!) • Hardware~25K€ ex VAT + Site + Staff • Enhance intercomparison of calibration labs

  16. Acknowledgements • Project funding: • BELSPO/HYPERMAQ • ESA/HYPERNET-OC • EU/H2020/HYPERNETS • Partners: • RBINS (K. Ruddick, D. Vanderzande, M. Beck, C. Goyens, Q. Vanhellemont, H. Lavigne, J. Cardoso) • VLIZ (D. Vansteenwegen, T. Gritzalis, A. Cattrijsse • LOV (D. Doxaran, C. Penkerch, E. Leymarie) • IAFE/CONICET (A. Dogliotti, F. Grings) • SKLEC (F. Shen) + • TARTU (J. Kuusk, A. Reinart, R. Vendt) • CNR (V. Brando, D. Dionisi, C. Giardino, R. Santoleri) • NPL (N. Fox, N. Origo) • GFZ (D. Spengler, L. Guanter, K. Segl)

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