LSP Breakout Challenges

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LAI Evaluation and Protocols WorkshopBackground
and Charge

• Jeffrey L. Privette
• Chair, Land Product Validation Subgroup

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Land Remote Sensing in 21st Century

• Data Rich Environment (Moderate resolution)
• AATSR, VEGETATION, MODIS, AVHRR, GLI, SAC-C,
  MERIS, POLDER, NPP/NPOESS, SeaWiFS
• Operational land products
• E.g., LAI, FPAR, Land Cover/Change, Albedo, NPP
• Multiple temporal and spatial scales

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Implications of Operational Land Products

• Single algorithm
• Consistent global approach
• Accuracy varies with target
• Less scientific oversight
• Much greater but less critical user community
• Product interdependencies (e.g., surface
  reflect.)
• Products used into large-scale process models
• National and international policies
• Errors increasingly important
• e.g., Antarctic ozone hole found late

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Evaluation QA vs. Validation

• Quality Assessment
• Basic sensibility checks
• Qualitative
• Validation
• Comparisons with independent measurement source
• Quantitative
• Global products point to international
  cooperation/ standards
• CEOS WGCV Land Product Validation Subgroup

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Context of LPV Subgroup

• Committee for Earth Observing Satellites (CEOS)
• Purpose to coordinate civilian observations from
  space
• Complimentarity, compatibility, exchange
• Composed of the worlds space agencies
• Two Working Groups
• Working Group on Information Systems and Services
  (WGISS)
• Working Group for Calibration and Validation
  (WGCV)
• Charter facilitate and encourage standards,
  efficiencies, best practices
• Five Subgroups
• Synthetic Aperture Radar
• Microwave Sensors
• Terrain Mapping
• Infrared and Visible Optical Sensors
• Land Product Validation

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LPV Subgroup Organization

• Implementation
• Topical workshops
• Reports, recommendations.
• Community activities to address issues/problems
• Leadership
• Chair Jeff Privette (NASA tenure 3-5 years)
• Deputy Chair Jeff Morisette (SSAI)
• European Lead Kurt Gunther (DLR)

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LPV History

• Organizational meeting in Ispra (2000)
• Charter, Vision, Work Plan
• GOFC chosen to provide an initial programmatic
  focus for LPV
• WGCV, CEOS approval in October 2000
• Additional discussions in January 2001
• Aussois, France (ISPRS PMSRS)
• Washington DC (MODIS Science Team Mtg.)

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Global Observation of Forest Cover (GOFC)

• Part of the Global Terrestrial Observing System
  (GTOS) contributing to the IGOS Carbon Theme
• Objective to improve operational monitoring of
  land surface from the carbon perspective
• GOFC themes
• Land cover
• Biophysical Parameters (LAI/FPAR/NPP)
• Fire
• Providing validated products is a high priority
  for GOFC

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Year 2001 Focus TopicBiophysical Parameters

• Initial Focus Leaf Area Index and FPAR
• MODIS product released in August, 2000
• Forthcoming GLI, MISR, MERIS (VI-derived)
• Informal Meetings
• May 00 (Ispra), Jan. 01 (ISPRS/Aussois), Jan
  01 (MODIS Sci. Team Mtg., Washington)
• Major validation projects afoot
• VALERI, BigFoot, Canadian Network, SAVE

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LAI Product Evaluation

• 12-18 month pathfinder
• Shake-out for more rigorous, longer-term and
  multiproduct comparisons
• Evaluation of operational and research products
• Leverage Year 2000 field campaigns (24)
• 1st Workshop Frascati, June 6-7, 2001

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LAI Product Evaluation Sites

LAI and satellite data collected in Year 2000
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Support of LAI Evaluation Sites
SATELLITE DATA Multiple sensors, various
scales, subsetted over the site and WWW
accessible.
Ancillary/GIS Layers such as - elevation
- land cover - reference layer (with
political boundaries, airports, water
bodies) Scientific Networks such as AERONET
and FLUXNET data
Field and airborne data WWW accessible
Graphic courtesy of the BigFoot program
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Steps To Global LAI Validation

• Identify and endorse best methods ? Standards
  (v.1)
• Link (by methods, data exchange) existing
  project-based site networks into Global Test
  Site Network
• Critical Assessment of Global Test Site Network
• Statistical credibility, representivity, size,
  scheduling
• Feedback to Algorithm Developers, CEOS community

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Charge

• Evaluate LAI products from satellites (Day 1)
• Challenging conditions, biomes
• Product idiosyncrasies
• Discuss/draft Best Methods for LAI data
  collection and analysis (Day 1 and 2)
• Site measurements (Space, Time, Method)
• Scaling
• Comparisons with products
• Requirements for community to do job (tools)
• Think and work as a team in service to satellite
  product user-community