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MODIS Albedo Subsets for Selected Field sites. Bob Cook, Steve Margle, Susan Holladay, and Lisa Olsen Oak Ridge National Laboratory Oak Ridge, Tennessee, USA 2nd CEOS/WGCV/ Land Product Validation (LPV) Workshop on Albedo Products Vienna, Austria April 28–29, 2005.

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MODIS Albedo Subsets for Selected Field sites

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Modis albedo subsets for selected field sites l.jpg

MODIS Albedo Subsets for Selected Field sites

Bob Cook, Steve Margle,

Susan Holladay, and Lisa Olsen

Oak Ridge National Laboratory

Oak Ridge, Tennessee, USA

2nd CEOS/WGCV/

Land Product Validation (LPV)

Workshop on Albedo Products

Vienna, Austria

April 28–29, 2005


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Collaborators / Contributors

  • Jeff Morrisette, Nazmi El Saleous (NASA GSFC)

  • Crystal Schaaf and Ranga Myneni (Boston University)

  • Steve Running and Faith Ann Heinsch (University of Montana)

  • Giri Palanisamy and Tammy Beaty (ORNL)


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Goal

  • To provide subsets of MODIS Land Products in a format and spatial scale useful to field investigators

    • Facilitates interaction between remote sensing scientists and field investigators

    • Easily compare satellite data with ground-based measurements

  • Used for validation of MODIS Land Products


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MODIS ASCII Subsets

  • Subsets of Terra and Aqua MODIS Land Products for 280 sites worldwide (field sites or flux towers) in an easy-to-use ASCII format

    • 7 km x 7 km centered on flux tower or field sites

  • Two annual products, four 8-day products, two 16-day product, and calculated albedo, from 2000 to present


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BSRN Sites

Toravere, Estonia

Tateno, Japan

Payerne, Switzerland

Barrow, Alaska

S. Great Plains, Oklahoma

Fort Peck, Montana

Bondville, Illinois

Boulder Colorado

Penn State, Pennsylvania

Goodwin Creek, Mississippi

Other Sites

Guzelyayla , Turkey

Ovacik, Turkey

Arabia1, Saudi Arabia

Ngotto Forest, Cent.African Rep.

RAC, Central African Republic

Nile Delta, Eqypt

Novara, Italy

Po Valley, Italy

Hapex-Sahel, Niger

Lamto, Cote D'Ivoire

Nigeria, Nigeria

Suchow, China

Mammoth Mountain, CA, USA

ARS-NE PLRC, PA, USA

Pleasant Plains, IL, USA

Allegheny Nat. Forest, PA, USA

MODIS Subset Sites: Albedo Related


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Greenland (Denmark)

Crawford_Point 2

Crawford_Point 1

DYE-2

JAR1

JAR2

Saddle

South Dome

SM2

Summit

ETH/CU Swiss Camp

MODIS Subset Sites: Albedo Related


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MODIS ASCII Subset Web Site: http://www.modis.ornl.gov/modis/


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User-selects optical depth and szn


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Albedo Calculated from MODIS BRDF Product

  • MODIS BRDF Albedo Model Product (MOD43B1) contains parameters for calculating albedo for visible, near-IR, and shortwave

  • Black Sky albedo

    • ƒ(parm 1, parm 2, parm 3, szn)

  • White Sky albedo

    • ƒ(parm 1, parm 2, parm 3)

  • Blue Sky albedo

    • ƒ(white sky albedo, black sky albedo, optical thickness)


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Quality Assurance

  • Provide quality assurance data layers

    • Including snow

Toravere BSRN, Estonia, January 1, 2005


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Information at bottom of Grid Display


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MODIS ASCII Subsets Web-Based Data Visualization: GridToravere BSRN, Estonia


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MODIS ASCII Subsets Web-Based Data Visualization: Time SeriesToravere BSRN, Estonia

Visible Broadband Blue Sky Albedo (fraction)

Pixel Values

Mean Value of Pixels

Percent of Pixels that met QC Criteria

Year


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Additional data compiled for albedo validation

  • Broadband Diffuse Irradiance Climatology for the selected MODIS ASCII Subset Sites (n = 254)

    • Based on AERONET data

    • Prepared by Privette and Hoffman

    • Available from ORNL

      ftp://daac.ornl.gov/data/eos_land_val/albedo/

  • Subsets of Optical Depth (MOD04) for 24 sites;

    • Summit, ETH_CU_Swiss_Camp, Tateno, Fort_Peck_Montana, Payerne, BARC, Barton_Bendish, BOREAS_BERMS, Jornada, Lake_Tahoe, Mandalgobi, Metolius_Old_Pine, Tapajos, North_Temperate_Lakes

    • Available from NASA GSFC

      ftp://windhoek.nascom.nasa.gov/private/ichoku/MAPSS/


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Future Plans: MODIS ASCII Subsets

  • Continue to offer subsets of Collection 4 MODIS Land Products from Terra and Aqua

  • Add Continuous Vegetation Field subsets when available

  • Evaluate current sites and seek additional sites for future processing / reprocessing (e.g., Collection 5 in late-2005)

    • To have your field site added to the MODIS Subset Collection, we need the geographic coordinates (to four significant decimal places; 10s of meters) and your commitment to share data


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Need site location good to 0.0001 degree

1 minute uncertainty yields +/- 2 km or 25 pixels

Uncertainty of +/- 1 minute


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Future Plans: MODIS Subset Pilot

  • Tool to enable on-the-fly subsetting and visualization

    • For any area in North America up to 200 x 200 km

    • For pre-selected sites for the rest of the world

  • Incorporate albedo calculation from MOD43B parameters


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MODIS ASCII Subsets Web Sitewww.modis.ornl.gov/modis/

Contact:Bob Cook

ORNL DAAC

[email protected]


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