Ground Segment Interoperability in the GSCB Missions Pleiades

JN.Hourcastagnou /R.Moreno / A. Meygret/ V.Toumazou

(CNES)

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Pleiades status (1/2) • Launch from KOUROU with SOYOUZ launcher, 17th of December 2011 !! • First Image the 20th of December • Technical Commissioning Review : 1st of March 2012

– System is fully validated –  all system requirements are met :

• 450 images / day / satellite (PA+XS mode) • Mosaïc, bi stereo and tri-stereo capabilities • 4 spectral bands (blue, green, red and infrared) • 50 cm products • imaging swath of 20 km at nadir • single-pass collection of mosaics with a footprint of 100 km x 100 km • near-real-time stereo and tri-stereo acquisition with a 20 km x 280 km footprint • daily coverage of 1,600,000 sq.km.

• Full image quality commissioning :On going until June 2012 • Thematic Commissioning : On going until March 2013 • Second satellite (PHR 1B) : launch foreseen end 2012 (7 Nov-7 December)

• http://smsc.cnes.fr/PLEIADES/premieres_images.htm • http://www.flickr.com/photos/pkpro/sets/72157628743311535/ • http://image-cnes.fr/1-loeil-du-satellite/bora-bora-vue-par-pleiades/

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Pleiades Status( 2/2) •  Two ways to access the system

–  Defence channel : •  50 requests maximum per day for 2 satellites

(among 700) with high priority level •  Specific defence Users Centres in Spain and

France •  The 2 centres are fully operational.

–  Civil channel :

•  delegated to a civil Operator (Astrium GEO-Information Services ,ex Spot Image) = 650 images per Day for 2 satellites.

•  This center is ready to work for commercial production.

•  40% for Public Service : Institutional Users of the cooperating countries and GMES at operational cost

•  60% for commercial use

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Ground Data flow concept of Pleiades

Strategic Partners Channel Partners

Clients

Network of Regional Image Receiving

Station

Kiruna receiving station

(Sweden)

Toulouse main receiving station (France)

High Latitude Uplinks station Kerguelen, Kiruna

Programming and Tasking preparation

Pleiades Spacecrafts

Control and Command

X-Band S-Band

World-wide Archive Master Catalogue

Processing

Media or network data transfer

X-Band

CNES

Acquisition Request

Mission Plan

List of AR 3 times/ day

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HMA implementation First experience comments and recommendations

•  HMA-I status ( see Astrium GEO-Information Services presentation)

•  CNES Comments on HMA : –  CNES considers HMA as THE interoperability standard for EO

data –  But

•  This standard is very complicated and difficult to implement and should be simplified (e.g. Opensearch) for a better diffusion

•  This standard has competitors : –  In Europe, GENESI-DEC (easier to implement) is becoming a standard

de facto (implemented within GENESI, SCIDIP, …), presented by Terradue at NASA and at GEO/GEOSS

–  In CEOS/WGISS and GEO/GEOSS CWIC protocol is used by a lot of agencies (NASA, NOAA, USGS, China, INPE and probably soon in JAXA, CCSRS, …)

•  CNES does not want to implement several interoperability standards for EO data.

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Quality Assurance for Earth Observation (QA4EO)

•  The implementation of the guidelines at CNES: –  Pre-flights activities:

•  characterization/calibration using traceable references ⇒ budget documents + sensors data are internally managed and archived

•  Level 1 processing methods description published for users

www.spotimage.fr

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Quality Assurance for Earth Observation (QA4EO)

–  Post launch activities: •  IOT: complete characterization/calibration

–  Comparison to pre-flight measurements and specifications –  Documents :

»  Detailed performance and calibration budgets (CNES internal documents)

»  Performance report (synthetic performance budget, method description, calibration parameters) published

»  Publications (news, conferences, workshops,…) –  Products:

»  Complete traceability of the processing through Processing Parameters management

»  Calibration parameters updated

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Quality Indicators: ⇒ at pixel level for radiometry mainly (singularity, saturation,…) ⇒ At product level for geometry

⇒ at processing level (input data integrity, registration errors, spike detection for sounding,…)

Quality Assurance for Earth Observation (QA4EO)

PLEIADES Dimap examples

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Quality Assurance for Earth Observation (QA4EO)

•  Routine: periodic calibration and performances assessment →  Performances report updated regularly

examples: →  SPOT, PLEIADES Image quality performances: annual →  IASI Quarterly performance report…

→  Product information updated

•  CAL/VAL infrastructure used for own missions cal/val activities:

–  Technical Expertise Center developed for each mission: Part of the system: interfaced with the payload data ground segment and the flight operation segment; used during the IOT and routine for :

- calibration and performance assessment - L1 processing parameters update - on board processing parameters update

•  Takes advantage of generic multi-mission tools (advantage of the genericity: well validated tools and easy cross comparison between sensors):

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Long Term Data Preservation (LTDP) •  Missions

•  SPOT 1 2 3 4 5, Venµs, Pléiades •  JASON 1 2 3, Topex, Altika/SARAL •  Polder, Parasol, Calipso,Megathropique

•  Status of the archive –  Guidelines

•  Already level A compliant and partly level B •  The guidelines are covered by CNES normative

documentation (RNC) •  CNES does not intend to do more for the moment

–  Standards / related activities •  CNES is an active member of LTDP WG •  CNES is actively involved in CCSDS standardisation

(OAIS, PAIS and PAIMAS) •  CNES is involved in SCIDIP, but with a very limited

man power

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Future CC/CDN pilot/study activities •  In cooperation with ESA and DLR, CNES intends to participate to one of the flagship projects selected by the European CC initiative (Helix Nebula) : the Geohazard SuperSites Exchange Platform.

• In the 2013-2017 timeframe, CNES plans to continue to invest in its own archiving facilities and by the time being does not have any project to evolve its operational infrastructure toward CC / CDN.

• However, in the frame of the French thematic centres, CNES foresees to use CC technologies in order to reprocess and archive products that could be freely distributed to the scientific community (private or collaborative cloud)

• CNES thinks that GSCB efforts in CC and the European CC initiative should converge and adopt the same standards, SSI rules

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Issues and comments (1/2)

•  As stated previously (slide n°5), HMA standards have competitors and are quite complex. Therefore the HMA Architecture Working group should consider simplifying them (for instance introduction of opensearch)

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–  In order to facilitate interoperability and inter-accessibility between earth observation ground segments, GSCB could address the following topics that become more and more relevant in the future ground segment architectures :

•  Cloud computing (could be addressed by participating to the european CC initiative Helix Nebula)

–  Standardisation of the interface for EO data and processing –  Definition of a strategy for the implementation of a cloud infrastructure in

Europe

• Data and processing distributed architectures –  Standardisation of the authentication : SSO –  Standardisation of the processing services interfaces : e.g. WPS

Issues and comments (2/2)

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Suggestions concerning the GMES operations concept •  What are the plans regarding GCMs to replace Envisat ? •  Will Esa encourage the use of GCMs to simulate and prepare

Sentinels missions (Spot for S2, Cryosat for S3…)? •  Announced at Esa Info Day in april 2011 :”Current initial operations

based on data from GMES Contributing Missions provided to GMES Core Services.” but also an explicit link to EO data users on the scheme of the PDGS presented. In this framework, it is useful to have the state of the art related to –  Data Policy –  Data access

•  The Contributing Missions are seen as gap filler. But they can also be used to perform CalVal/intercalibration with Sentinels. What are Esa’s plans about that ? How will it be organised taking into account that “It is expected that every mission owner/operator manages the quality of its products.”?