MERIS US Workshop. 14 July 2008

Transcription

1 MERIS US Workshop 14 July 2008

2 MERIS US Workshop 08:10-08:55 08:55-09:10 H. Laur (ESA) Agenda a.m. ENVISAT/MERIS mission status, access to MERIS data and distribution policy Discussion 09:10-09:40 09:40-10:00 10:00-10:20 10:20-10:40 10:40-10:55 10:55-11:10 11:10-11:30 11:30-11:50 11:50-13:20 P. Regner (ESA) B. Arnone (NRL) S. Delwart (ESA) S. Delwart S. Delwart Examples of the use of MERIS data in marine & land applications Examples of MERIS data use for U.S. applications MERIS instrument overview Instrument characterization overview Discussion Coffee break Instrument calibration methods and results Discussion Lunch break

3 Agenda p.m. MERIS US Workshop 13:20-13:50 13:50-14:10 14:10-14:30 14:30-14:50 14:50-15:10 L. Bourg (ACRI) S. Delwart L. Bourg Level 1 processing Discussion Vicarious calibration methods and results Discussion Overview Level 2 products 15:10-15:25 15:25-16:25 16:25-17:10 17:10-17:25 17:25-17:40 17:40-18:00 L. Bourg P. Regner H. Laur Coffee break Level 2 processing Discussion BEAM Toolbox Plans and status of the OLCI onboard GMES Sentinel-3 Discussion

4 MERIS US Workshop, July 14 th, 2008, Washington (USA) ENVISAT / MERIS mission status, access to MERIS data and distribution policy Henri LAUR Envisat Mission Manager & Head of EO Missions Management Office

5 ESA: the European Space Agency The purpose of ESA: An inter-governmental organisation with a mission to provide and promote - for exclusively peaceful purposes - the exploitation of: Space science, research & technology Space applications HEADQUARTERS - Paris, France Director General s office and general administration EAC - Cologne, Germany European Astronaut Centre ESTEC - Noordwijk, the Netherlands Satellite development centre ESRIN - Frascati, Italy Earth Observation centre ESOC - Darmstadt, Germany European Space Operations Centre ESAC - Villafranca, Spain European Space Astronomy Centre Staff in post : ~ 2000

6 EO missions handled by ESA METEOSAT M-1, 2, 3, 4, 5, 6, 7 METEOSAT Second Generation MSG-1, -2, -3 METOP-1, -2, -3 METEOSAT Third Generation Meteo in cooperation with EUMETSAT ERS-1, -2 Earth Explorers ENVISAT GMES Cryosat (2) (Polar Ice Monitoring) GOCE (Gravity and Ocean Circulation Explorer) SMOS (Soil moisture) ADM/Aeolus SWARM EarthCARE Sentinel satellites & National missions (e.g. SPOT, Pleiades, TerraSAR, Cosmo-Skymed,...) Science to better understand the Earth Applications Services to initiate long term monitoring systems and services and Third-Party Missions: European access to non-esa missions ALOS, SPOT-4, Landsat, Kompsat-2, SeaWIFS, MODIS...

7 Envisat MERIS 12 July 2008 Envisat mission and users

8 ENVISAT Launch by ESA ARIANE 5 on March 1 st, 2002 Injection on perfect orbit

9 ENVISAT: the largest civilian EO satellite Dimensions Launch configuration: length 10.5 m envelope diameter 4.6 m In-Orbit configuration: 26m x 10m x 5m Mass Total satellite 8140 Kg Payload 2050 Kg Power Solar array power: 6.5 kw (EOL) Average power demand: Sun Eclipse (watts) (watts) Payload Satellite Orbit 800 km as ERS, sun synchronous 10:00, i.e. 30 minutes before ERS-2

10 ENVISAT: 10 ways to monitor the Earth Michelson Interferometric Passive Atmospheric Sounder Advanced Along Track Scanning Radiometer Medium Resolution Imaging Spectrometer Scanning Imaging Absorption Spectrometer for Atmospheric Cartography Microwave Radiometer to Data Relay Satellite Artemis Global Ozone Monitoring by Occultation of Stars Doppler Orbitography and Radio-positioning Integrated by Satellite Radar Altimeter 2 to Ground Stations Advanced Synthetic Aperture Radar Launch 1 st March 2002 Orbit 800 km, sun synchronous 10:00 am, i.e. 30 minutes before ERS-2

11 MERIS instrument status Status: MERIS Very stable and excellent performance since launch. Full redundancy available. Calibration diffuser degrading as expected. Risks and evolution: Very smooth ageing With the current ageing rate the required radiometric accuracy of the on-board diffusers can be maintained until 2013 Current performances: Excellent Expected evolution: Excellent

12 Some Envisat results Yellowstone caldera accelerated uplift: up to 7 cm / year Science, 9 Nov. 2007: Accelerated Uplift and Magmatic Intrusion of the Yellowstone Caldera, 2004 to 2006, Wu-Lung Chang, et al., Univ. of Utah (ESA Cat-1 project #2765) ASAR Interferometry

13 Some Envisat results September Arctic sea ice extent Canada Russia Arctic Sea: Fast decrease of sea ice extent Greenland Mosaic of ASAR images (10-days)

14 Some Envisat results 15 years of radar altimetry ERS-1 / ERS-2 / Envisat Mean sea level rise This is one of the Essential Climate Variables (ECV)

15 Some Envisat results NO 2 concentration increase by 50% over China (during last 8 years) A. Richter, J. Burrows, Nature, Sept ERS-2 Envisat

16 Synergy between ENVISAT imaging instruments AATSR MERIS ASAR Narrow Swath Modes ASAR Wide Swath Mode

17 Synergy between ENVISAT imaging instruments Hurricane Katrina Wind field (derived from ASAR) Cloud Top Pressure (derived from MERIS)

18 ENVISAT mission: 6 years! Bam earthquake Tectonic uplift (Andaman) Arctic 2007 First images Global air pollution Ozone hole 2003 Hurricane Katrina ~2100 scientific projects + several GMES pre-operational projects Prestige tanker oil slick B-15A iceberg Chlorophyll concentration CO2 map Launch Calibration Review Validation Workshop MERIS Workshop InSAR Workshop Envisat Symposium Salzburg (A) MERIS (A)ATSR Workshop InSAR Workshop Altimetry Conference Atmospheric Science Conference Envisat Symposium Montreux (CH) InSAR Workshop Mar 02 Sep 02 Dec 02 Nov 03 Dec 03 Sep 04 Sep 05 Dec 05 Mar 06 May 06 Apr 07 Dec 07

19 Next MERIS workshop: Sept. 08, Frascati Objectives: Present latest results and status of research and development projects Update MERIS/AATSR users on instrument performance and product quality Formulate recommendations for improved data access and utilization, algorithms, user tools Foster collaboration between MERIS and AATSR research groups Inform users on the current status of the GMES Sentinel 3 mission 105 oral presentations, 75 Posters Registration at:

20 Next MERIS workshop: Sept. 08, Frascati September 2008 Skagerrak MERIS FR Chlorophyll June 6, km Denmark Baltic Sea North Sea Germany

21 Current MERIS users MERIS projects/users per country 358 Category 1 projects from the United States (all types of data) 65 US projects requesting MERIS data (i.e. 18 % of total) 33% asking Red. Res. data, 66% asking Full Res. data

22 Envisat MERIS 11 July 2008 MERIS data acquisition

23 MERIS data acquisition MERIS has 2 operation modes: Reduced Resolution (RR): 1040 m x 1200 m acquired systematically (43 minutes per orbit) Full Resolution (FR): 260 m x 300 m specific planning (currently ~18 min. per orbit) Swath width is 1150 km global coverage is reached every 3 days

24 MERIS data acquisition 20 MERIS Full Resolution MERIS Full Resolution data acquisition: a gradual increase since beginning of mission min/day 16 Average minutes / orbit min/day 150 min/day Jan-03 Apr-03 Jul-03 Oct-03 Jan-04 Apr-04 Jul-04 Oct-04 Jan-05 Apr-05 Jul-05 Oct-05 Jan-06 Apr-06 Jul-06 Oct-06 Jan-07 Apr-07 Jul-07 Oct-07 Jan-08 Apr-08 Recent increase thanks to new Canadian stations

25 ENVISAT data acquisition ARTEMIS Ka-Band (real time & recorders) ENVISAT 75 % of MERIS FR 50 % of MERIS RR 50 % of AATSR X-Band X-Band (real time & recorders) Ka- Band KIRUNA ESA/ESRIN MATERA

26 MERIS data acquisition Downlink in Real Time to Kiruna station Downlink to Canadian stations Recorded on board for downlink via Artemis or Kiruna Downlink in Real Time to ESRIN station via Artemis In yellow, data that are downlinked in Real Time to ESA Kiruna station. In orange, data that are downlinked in Real Time to ESRIN station via Artemis. In white, data that are recorded on-board, then downlinked to Kiruna or via Artemis. In blue, data that are downlinked in Real Time to Canadian stations: Temporary set-up: raw data sent by Internet to Kiruna for processing Final set-up: processing in Canada (early 2009)

27 Envisat MERIS 11 July 2008 MERIS data access

28 ESA Earth Observation Policy Data policy defined by ESA Member States in 1997: to stimulate a balanced development of Science, Public Utility and Commercial Applications, consistent with the mission objectives, to maximize the beneficial use of data from ESA EO satellites. Project purpose Category 1 use Research, Applications Development Most of ESA data (e.g. MERIS) available only through Cat.1 Category 2 use SAR & HR optical data available in Cat.1 or Cat.2 Distribution responsible esa using ESA facilities/stations competing Distributing Entities using ESA facilities and/or agreements with non-esa stations Data costs Costs of reproduction Free on Internet Cat.1 use Terms & Conditions Data costs defined by competing Distributing Entities

29 Category 1 use Terms & Conditions Main points: to use the data provided for Category 1 use only within the project team (i.e. PI and co-pis) i.e. no data redistribution outside the Cat.1 use project team to widely publish the project results in scientific publications or presentations, with data citation: [mission or instrument] Data provided by European Space Agency (to facilitate ESA web searching of publications, and subsequent reporting on mission/instrument achievements) Each PI shall sign the Category 1 use Terms & Conditions.

30 How to apply for MERIS data access? t Application for Category 1 use data access can be submitted to ESA at any time using the ESA Earth Observation Principal Investigator portal (

31 Registration or full proposal? Registration Category 1 Project Proposal

32 Products systematically available on Internet Registration Updated list available at :

33 MERIS products available on Internet NRT & recent data availability period coverage MERIS Red. Resolution (1200 m) Level 1 & Level 2 Systematic (i.e. processing of all data) Products available within 3 hrs from acquisition (95%) Rolling archive of last 15 days Worldwide coverage MERIS Full Resolution (300 m) L1 & L2 Europe coverage Systematic (i.e. processing of all data) Products available within 3 hrs (L1) and within 12 hrs (L2) from acquisition (90%) Rolling archive of last 20 days Europe coverage Simple registration MERIS Full Resolution (300 m) L1 & L2 North America Systematic (i.e. processing of all data) Temporary set-up: Products available within 9 hrs (L1) and within 24 hrs (L2) from acquisition (90%) Rolling archive of last 20 days North America coverage MERIS Full Resolution (300 m) Other geographical coverages Not systematic On request Limited quantities Few hours after acquisition According to instrument planning Full proposal NRT data from other Envisat sensors (e.g. ASAR, AATSR) also available on Internet

34 Which data access systems for NRT and recent data? Same NRT and recent dataset for both systems NRT and recent data Rolling Archives (ftp or http) NRT and recent data Web File Server (http) Complete product (e.g. MERIS orbit) Each acquisition station has its own rolling archive Geographical selection (with product subset to decrease data volume for download) One single web site for all acquisition stations Current download problems at Kiruna station!

35 MERIS products available on Internet Archived data Archived availability period coverage Systematic MERIS Red. Resolution (1200 m) Level 1 & Level 2 (i.e. for each re-processing of the data) Whole mission since mid-2002 Worldwide coverage MERCI Web Interface Simple registration Not systematic On request MERIS Full Resolution (300 m) Limited quantities on Internet Whole mission since mid-2002 Worldwide coverage Products usually provided on DVD-Rom Full proposal

36 Which data access systems for archived data? MERCI web interface, giving access to global MERIS Reduced Resolution data archived since mid TBytes of MERIS RR data Cat.1 registration requested to MERCI web interface will be used also for Envisat/ERS (A)ATSR archived data (Oct. 2008)

37 EOLI-SA: On-line multi-mission catalogue To order archived MERIS FR data Yesterday

38 MERIS Level 3 demonstration products Chlorophyll-a Case 1 Total water vapour column Aerosol optical thickness Aerosol Angstrom coefficient Global Vegetation Index Available at: No registration required

39 MERIS data reprocessing MERIS Reduced Resolution data reprocessing First data reprocessing in 2004 Second data reprocessing in 2006 Third data reprocessing was planned for 2nd half 2008, but is postponed to 2009 Main drivers: Observed discrepancies in water leaving reflectances with match-ups (Boussole between 13% (490nm) and 31% (412nm) errors). Vicarious adjustment at Level 2: same method as applied by NASA for SeaWIFS (Franz et al [Applied Optics 46]; Bailey et al. 2007, submitted to JGR). It consists in computing average multiplicative gain factors to correct the TOA signal using a database of match-ups (Boussole, or Moby, or both). New aerosol properties tables.

40 Envisat MERIS 10 July 2008 MERIS science team

41 MERIS data quality: organisation MERIS Quality Working Group (MERIS QWG) Mission Manager Mission requirements & evolutions Request/approval & reporting MERIS ESL s Engineering Support Laboratories Algorithm dev. Product validation Processor validation Support for Validation Campaigns Routine QC Processor maintenance PDS integration ESA DPQC Data and Product Quality Control CAL/VAL Teams

42 Envisat MERIS 10 July 2008 MERIS documentation

43 Documentation about MERIS data

44 Documentation about MERIS data MERIS Product Handbook

45 Documentation about MERIS data Extract of DPM2

46 Documentation about MERIS data Cyclic Report: Detailed information of every 35 day period of: instrument performance modifications in the processing chain results of cal/val activities

47 Envisat MERIS 10 July 2008 Envisat mission duration

48 Envisat satellite status and evolution Envisat satellite is in good health and with an expected reasonable evolution. MERIS instrument is in excellent shape. Efficient consumption of on-board hydrazine allow to operate nominally Envisat until But most of hydrazine will be consumed in ESA has elaborated a technical solution to further extend mission by 3 years, i.e. until 2013, based on a decrease of orbit altitude. the solution allows to carry on with the current Envisat applications, including MERIS applications. Funding for Envisat operations extension ( ) is however not yet granted. Prestige tanker oil slick Ozone hole 2003 Bam earthquake Chlorophyll concentration Global air pollution B-15A iceberg Hurricane Katrina CO2 map

49 Envisat mission extension Envisat 3-years extension [ ]: the need to prevent gaps for long-time series essential for Earth Science a growing demand for operational data for GMES ERS-2 SAR ATSR Altimetry GOME Scatt Envisat ASAR MERIS AATSR Altimetry GOMOS SCIAMACHY MIPAS MetOp Risk of data gap & Sentinel-1a Launch end 2011 Need of back-up Sentinel-1b Sentinel-3a Launch early 2013 Sentinel-3b Sentinel-4? Sentinel-5? Envisat extension: funding not yet granted

50 Envisat MERIS 11 February