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RadCalNet Status M. Bouvet on behalf of the RadCalNet WG.

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Presentation on theme: "RadCalNet Status M. Bouvet on behalf of the RadCalNet WG."— Presentation transcript:

1 RadCalNet Status M. Bouvet on behalf of the RadCalNet WG

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3 Outline The sites The data circulation The data processing The portal The documentation Site intercomparison RadCalNet WG and the WGCV The planning

4 RadCalNet input data 1.The surface reflectance: 30 minute intervals 9 am to 3 pm local standard time Nadir view only 10 nm intervals from 400 nm to 2500 nm (=goal) or at least between 400 nm and 1000 nm + uncertainty Nadir surface reflectance with uncertainty

5 RadCalNet input data 2.Concomitant atmosphere data for the TOA propagation: Pressure + uncertainty Temperature + uncertainty Total column water vapour + uncertainty Total column ozone + uncertainty Aerosol optical thickness + uncertainty Aerosol Angstrom exponent + uncertainty Aerosol Type (following MODTRAN options)

6 RadCalNet output data TOA reflectance: 30 minute intervals 9 am to 3 pm local standard time Nadir view only 10-nm intervals at least between 400 nm and 1000 nm and possibly can beyond (up to 2500 nm) Aiming for a timeliness (input data and and TOA reflectance available 2 weeks after measurements at site. TOA reflectance with uncertainty

7 The sites Currently 3 instrumented are providing data to RadCalNet: Baotou (China) La Crau (France) Railroad Valley Playa (US) Gobabeb (Namibia)

8 Railroad Valley Playa Surface type: dry lakebed 4 radiometers (GVRs) + AERONET sun photometer + met station Data availability at RadCalNet portal: Sept 2014 - Present

9 La Crau Surface type: pebbles and low vegetation Instrument: CIMEL photometer (12 bands) Data availability at RadCalNet portal: Feb 2015 - Present

10 Baotou Surface type: Artificial target (3 colours) Instrumentation: Three automated spectrometers + (AERONET) sun photometer for atmospheric measurements + met station Data availability at RadCalNet portal: March 2016 – Present ~96m Black gravel White gravel Gra y grav el The Location of Cimel CE318 (One of AERONET sites ) Aerial image acquired in Baotou site October 17, 2015 Knife-edge target Stationary system in black and white targets Rotatory system in gray targets

11 Gobabeb Surface type: gravel plain Instrumentation: CIMEL 12 bands + fish eye camera + met station Current status: mast available - photometer calibrated and characterised – dry run test in UK during summer followed by installation in Namibia in Oct. Data availability: Expected from end 2016

12 Gobabeb NPL/CNES Site characterisation campaign Dec. 2015 => See Aimé’s presentation

13 The sites Since the beginning of the RadCalNet WG activities, significant have been efforts dedicated to: Operationally running the sites Providing site documentation => RadCalNet Quesionnaire Defining measurement uncertainties Feeding surface and atmosphere data to the RadCalNet processing ‘system’

14 The data circulation… today in practice Site X RadCalNet portal Calibration & QC & Processing Calibration & QC & Processing Raw measurements Surface reflectance and atmosphere products (RadCalNet specific) FTP RadCalNet Processing & QC RadCalNet Processing & QC Hyperspectral TOA reflectance @ 30 mn interval for nadir view Site Y Calibration & QC & Processing Calibration & QC & Processing Raw measurements Surface reflectance and atmosphere products (RadCalNet specific)

15 Data currently available 1.All in version 00_00 2.La Crau : 95 I 2015; 58 I 2016 3.RRVP : 4.Baotou : 18/07/20 16

16 The RadCalNet processing Hosted by NASA/GSFC and based on Modtran 5 Parameterisation of the code will be fully documented Key assumptions of the RadCalNet processing: Lambertian surface Aerosol optical properties based on pre-defined types Pre-defined atmospheric profiles QC mostly inherited from site.input files RadCalNet Processing & QC RadCalNet Processing & QC

17 The RadCalNet processing On-going work by K. Thome / B. Wenny to propagate the surface / atmosphere uncertainties to TOA uncertainties via pre-computed LUT from Montecarlo MODTRAN runs RadCalNet Processing RadCalNet Processing Surface reflectance Atmospheric measurements TOA reflectance

18 The portal

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20 Documentation for users: RadCalNet data processing Document titleLead authorDue dateStatus RadCalNet data formatBrianNext teleconfDone – V4 available on RadCalNet site (but V3 still visible on homepage) RadCalNet processing and uncertaintiesBrianJune 2016 teleconf?

21 Documentation for users: site questionnaires Document titleLead authorDue dateStatus CEOS site questionnaire – TemplateMarcMeeting Dec. 2015V1 available on portal CEOS site questionnaire - BaotouLinlingNext teleconfDraft available on RadCalNet portal but with wrong template => to be reviewed by RadCalNet WG after template is updated CEOS site questionnaire - La CrauAiméNext teleconfOld Landnet questionnaire available on RadCalNet portal=> to be updated and reviewed by RadCalNet WG CEOS site questionnaire – Railroad Valley PlayaJeffNext teleconfOld Landnet questionnaire available on RadCalNet portal=> to be updated and reviewed by RadCalNet WG CEOS site questionnaire – GobabebEmma / AgaNext teleconfDraft available on RadCalNet portal => to be reviewed by RadCalNet WG. Will be updated after installation of instrument

22 Documentation for users: site measurement uncertainty description Document titleLead authorDue dateStatus Paper on measurement uncertainties - BaotouLinlingMeeting Jul. 2016? Paper on measurement uncertainties - La CrauAiméMeeting Jul. 2016? Paper on measurement uncertainties – Railroad Valley Playa JeffMeeting Jul. 2016? Paper on measurement uncertainties – Gobabeb Emma / AgaMeeting Jul. 2016? First version of measurement uncertainty documents should contain: Traceability diagrams Measurement equations Uncertainty tables

23 Documentation for users: general documentation Document titleLead authorDue dateStatus RadCalNet data policyAllMeeting Dec. 2015Done – Available on RadCalNet site RadCalNet quick start guideMarcMeeting Jul. 2016Draft available – To be reviewed by RadCalNet WG RadCalNet Reference PaperMarc + all?Meeting Jul. 2016 Tech Note / Paper: Landsat-8 and Spot-5 (and S2?) vs. RadCalNet All?Meeting Jul. 2016 Data policy in short: Publically available (after registration) Free Acknowledgment of RadCalNet and site owners when used: “Calibration data for this ‘work’ came from the CEOS WGCV RadCalNet service (www.radcalnet.org) and in particular from site X and Y.”

24 Documentation for candidate site owners: general documentation Document titleLead authorDue dateStatus Requirement Document 1: membership criteriaAllMeeting Dec. 2015Done – Available on RadCalNet site Requirement Document 2: site data provisionEmmaEnd 2016 Good Practice Guide 1: site selectionEmmaEnd 2016 Good Practice Guide 3: site characterisationEmmaEnd 2016Draft available and distributed for review by RadCalNet WG Good Practice Guide 3: site instrumentation and data processing EmmaEnd 2016 Good Practice Guide 4: site quality assuranceEmmaEnd 2016

25 RadCalNet membership for new sites

26 The TOA intercomparison of RadCalNet TOA simulation using space sensors as transfer radiometers between sites Objective: identify site-to-site differences in TOA predictions using the space sensors as transfer radiometers Plan: Intercompare: Remote sensing TOA data: Landsat-8 / SPOT-5 / Sentinel-2 / + ??? TOA simulations over the sites (both from RadCalNet and from site owners using their own TOA simulation tools)

27 The BOA intercomparison of RadCalNet surface reflectance using portable transfer radiometers Objective: identify site-to-site radiometric differences at surface radiance (reflectance) level Plan First the UoA and NPL transfer radiometers will be calibrated and compared before end 2016 Transfer radiometers will be operated at sites (blindly by site owners and/or with E. Wooliams) early 2017

28 Governance of RadCalNet will be at the WGCV. RadCalNet should be run by WGCV and be on their agenda. WGCV would do this through a committee of 3-5 people from both RadCalNet WG and some people from WGCV. These people would be appointed by WGCV and would be the arbitrator for RadCalNet membership and monitoring. That governance process should be in place before RadCalNet becomes fully public. Note that there will also be a technical RadCalNet WG under IVOS, for technical aspects of the discussion. This would be the work on the sites, the SI-traceability, discussion of comparisons and uncertainties etc.

29 Planning Beta testing from September 2016 to Q1 2017 Gobabeb site running by end of 2016 Start intercomparison of sites using the portable transfer radiometer in early 2017 Beta tester mini-WS in March 2017 (next RadCalNet WG meeting) RadCalNet goes public by Q2 2017

30 Questions?

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