A Hyperspectral network for ocean colour validation - PowerPoint Presentation

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A Hyperspectral network for ocean colour validation

by Kevin Ruddick,Royal Belgian Institute for Natural Sciences (RBINS)

water (ocean, coastal, lakes)

HYPERNET-OC

WC

WATERHYPERNET

NEXT WEEK’S (S3VT) TITLE:

An international network for validation

of water reflectance for all VIS/NIR spectral bands of

Sentinel-3AB

/OLCI

And all

future hyperspectral

sensors

(

inc

Sentinel-10)

And

CHRIS-PROBA

And

Pléiades

And SEVIR

IAnd MODIS-TERRA

And

MODIS-AQUA

And Landsat-8

And

Sentinel-2AB

And

PROBA-V

And

VIIRS

And all

future optical nanosatellites (

Planetscope

, etc.)

And

PACE

And all

other ocean

colour

sensors

10 years of MERIS validation data, including a few years of AERONET-OC…

[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

In situ Rhow490

In situ Rhow510

MERIS Rhow490

MERIS Rhow510

AERONET-OC = main validation source for MERIS (and OLCI):

1 image, 1 matchup

AND have

standardised calibration, processing and Quality ControlBUT do not cover all wavelengths

Heritage: NASA/JRC AERONET-OC

Federated network of instrumented sites for ocean color validation, spawned from larger AERONET networkBuilt up from 1 site (2002) to 15 (2017)Full details in [Zibordi et al, 2009]

[aeronet.gsfc.nasa.gov]

Ocean

Land

MAPE < 3%



12 bands

3% < MAPE < 5%

 8 bands

MAPE > 5%

 36 bands

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]

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” ...

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

Which instrument to use? (now)

TRIOS/RAMSES instrument:Hyperspectral 350-900nmRobust and mature (~100s in use since 2000)

Relatively low cost for high performanceManufacturer 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]Polarisation

sensitivity [Talone and Zibordi, 2016]Non-linearity tests [Tartu Observatory, FRM4SOC project]

Portable “FieldCAL” LED light source for relative calibration monitoring

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 2019International expansion: 2019-2020 [HYPERMAQ: LOV, IAFE, ...]

Network concept

Similar functionality to NASA/AERONET network

A new hyperspectral radiometer

integrated 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, Davide Dionisi

, Claudia Giardino, Clémence Goyens, Francisco

Grings, Luis Guanter, Edouard Leymarie, Tiia

Lillemaa, Christophe Penkerc'h, Anu

Reinart, Rosalia Santoleri, Karl

Segl, Dimitry Vanderzande, Quinten

Vanhellemont, Riho Vendt1. Royal Belgian Institute for Natural Sciences (RBINS), Brussels, Belgium2. Tartu Observatory (TO), Tartu, Estonia3.

Consiglio Nazionale delle Ricerche (CNR), Rome, Italy4. Instituto de Astronomía y Física del

Espacio, Consejo Nacional de Investigaciones Científicas

y Técnicas (IAFE, CONICET/UBA), Buenos Aires, Argentina5. Laboratoire Océanographique de Villefranche,

Université Pierre et Marie Curie – Paris 6 (UPMC/LOV), Villefranche-sur-mer

, France6. National Physical Laboratory (NPL), Teddington, United Kingdom7. Helmholtz Zentrum Potsdam DeustschesGeoforschungszentrum (GFZ), Potsdam, Germany8 Consiglio Nazionale

delle Ricerche (CNR-IREA), Milan, Italy

The HYPERNETS Project is funded by the European Union under the H2020 Program

INSTRUMENT

hyperspectrala) VIS/NIR b) SWIR

radiance, irradianceimaging camera

thermal control?

polarising filter?

SYSTEMS

Pointing robotsolar/wind power

anti-theft/animal/biofouling

rain/wind/wave protectionheating/cooling?

Calibration LEDdata transmission

+

turbidi/fluori/backscatter?web cam, sky cam?

(land) flux tower, etc.?NETWORKS

AERONET-OC/WATERHYPERNETRADCALNET (land)

and links toTERENO (land)

Reduce cost

Improve performance

Reduce cost

Add features

Expand networks

HYPERNETS Project Overview

Spectral range and resolution?

Azimuth/zenith pointing range and accuracy?

Other instrument or system features?

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 2019/07International expansion 2019-2020

WATERHYPERNET v2 (new “HYPERNETS” instrument)

2019/04, 2019/10, 2020/07: Prototype instruments2019/10, 2020/07, 2021/01: Systems for field testing

2022/02: Commercialisation

of instrument

Questions? Suggestions? Comments?

What can you/IOCCG

do to help?

Contribute to user needs

for:

I

nstrument (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

Acknowledgements

Project funding:BELSPO/HYPERMAQESA/HYPERNET-OCEU/H2020/HYPERNETSPartners:

RBINS (K. Ruddick, D. Vanderzande, M. Beck, C. Goyens, Q. Vanhellemont

, H. Lavigne, J. Cardoso)VLIZ (D. Vansteenwegen, T. Gritzalis

, A. CattrijsseLOV (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)