CEOS Land Product Validation Core Sites

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CEOS Land Product Validation Core Sites
Proposed joint activity between WGCV and WGISS
to provide web-based, easy access, to
satellite-derived data and products over
land Proposed by the land product validation
subgroup
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Motivation for CEOS Land Validation Core Sites

• Provide a focus for ongoing satellite, aircraft,
  and ground data collection for validation of CEOS
  member satellite/sensor products
• Provide scientists with sets of readily
  accessible in-situ and CEOS member instrument
  data for algorithm validation and improvement
• Build on infrastructure of existing scientific
  networks and validation sites
• International cost sharing opportunities
• Basis for long-term validation of time series

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CEOS Land Validation Core Sites Goals

• Facilitate validation and cross validation of
  Global Land products
• Allow synergy within and between Satellite/Sensor
  science teams for data collection and subsequent
  research
• Allow ready collaboration between validation
  investigators and existing science networks and
  programs
• Address science questions suitable for combined
  field and multi-resolution image data
• Provide science community with immediate, easily
  accessible data from CEOS member sensors
• Ramp-up validation efforts, leveraging off of the
  infrastructure and protocols developed through
  existing site activities, to include a more
  comprehensive sampling of Earths ecosystems

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Link to IGOS, TCO, GOFC

• Site would be registered with the GTOS
  Terrestrial Ecosystem Monitoring Sites (TEMS)
• The data sets and resulting correlative and
  time-series analysis can contributed to better
  product knowledge and assessment of the products
  stability and intercomparable (specified as the
  major challenges of the TCO theme)
• Site location chosen to help GOFC monitoring

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Site locations

• Start with sites which are currently part of
  exiting networks
• Initial sites EOS Core Sites and VALERI
• GOFC priority sites
• Additional sites CEOP/NASDA, CSIRO, GT-net,
  ILTERs
• Aim for representative biome types
• Productivity
• Global spatial extent
• Location in meteorological space (precip. Vs
  temp.)
• North/South Hemisphere validation
• Consider practical issues
• Accessibility
• Existing facilities (e.g. towers, laboratories,
  instrumentation)
• Heritage/long term ground-based commitment

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Land Validation Core Site Minimal Tower
Schematic
Indicates instruments in addition to those in
minimal tower configuration

• Radiometry
• Fluxes
• AOT
• Soil/Canopy

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Data Compilation for Land Validation Core Sites
SATELLITE DATA from various CEOS Member
sensors, 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 ILTERs
Field and airborne data WWW accessible
Graphic courtesy of the BigFoot program
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Distribution of Sites
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EOS Core Sites infrastructure as example
EDC DAAC MODIS, ETM, ASTER SeaWiFS subsets at
GSFC Ancillary data at Umd Field data
locally maintained
EOS Core Site web page provides link to on-line
ftp directories
ORNL Mercury system Archive and access of field
data
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WGCV/WGISS conceptual interaction

• WGCV
• site locations and data set requirements,
• negotiate subsetting and on-line storage of core
  site data
• some correlative analysis on these data, and
• interpretation of possible discrepancies between
  products

WGISS provide seamless internet-based access to
the multiple data sets
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WGCV/WGISS Example
MERIS and AATSR Validation Team (MAVT) Subset and
place on-line MERIS surface reflectance for Core
Sites
WGISS Provides single file with MODIS/MERIS
surface reflectance as multi-layer product
MODIS Land Validation Team (MLVT) Subset and
place on-line MODIS surface reflectance for Core
Sites
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Possible data

• Potential, future
• ENVISAT
• Aqua data
• GLI data/products

• Potential, existing
• ATSR-2
• SPOT
• TRMM
• AVHRR
• SAR products?
• ECMWF
• Meteosat
• DAO

• Currently on-line
• MODIS Land products
• ASTER
• SeaWiFS
• ETM
• TM ('90s era)
• Ancillary layers
• AERONET sun photometers

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Initial steps

• Seek approval of WGCV to move forward
• Submit proposal to WGISS
• Coordinate with GOFC/MAVT/MLVT on initial sites
  and products
• Work with WGISS to develop interface
• Consider additional sites and products via
  coordination with NASDA/CSIRO/others