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    • MODIS/Terra Land Water Mask Derived from MODIS and SRTM L3 Global 250m SIN Grid V061

    Metadata Updated: May 27, 2024

    The Terra Moderate Resolution Imaging Spectroradiometer (MODIS) Land Water Mask (MOD44W) Version 6.1 data product provides a global map of surface water at 250 meter (m) spatial resolution. The data are available annually from 2000 to present. MOD44W Version 6.1 is derived using a decision tree classifier trained with MODIS data and validated with the Version 5 MOD44W data product. A series of masks are applied to address known issues caused by terrain shadow, burn scars, cloudiness, or ice cover in oceans. Version 6.1 is the generation of a time series rather than a simple static representation of water, given that water bodies fluctuate in size and location over time due to both natural and anthropogenic causes. Provided in each MOD44W Version 6.1 Hierarchical Data Format 4 (HDF4) file are layers for land water mask and water body classification. A quality assurance (QA) layer provides users with information on the determination of water. The new seven class water classification layer provides values for shallow ocean, land, shoreline, inland water, ephemeral water, deep inland water, moderate ocean, deep ocean, and a classification deemed to fall outside of the projection.

    Improvements/Changes from Previous Versions

    • The Version 6.1 Level-1B (L1B) products have been improved by undergoing various calibration changes that include: changes to the response-versus-scan angle (RVS) approach that affects reflectance bands for Aqua and Terra MODIS, corrections to adjust for the optical crosstalk in Terra MODIS infrared (IR) bands, and corrections to the Terra MODIS forward look-up table (LUT) update for the period 2012 - 2017.
    • A polarization correction has been applied to the L1B Reflective Solar Bands (RSB).
    • Additional data files will be produced annually and are scheduled for distribution in the first quarter of the calendar year.
    • Seven-class water body classification layer produced at 250 meter resolution is provided in tiled format.
    • For Collection 6.1 and beyond, Antarctica data are now being produced.

    Access & Use Information

    Public: This dataset is intended for public access and use. License: No license information was provided. If this work was prepared by an officer or employee of the United States government as part of that person's official duties it is considered a U.S. Government Work.

    Downloads & Resources

    Dates

    Metadata Created Date February 28, 2024
    Metadata Updated Date May 27, 2024

    Metadata Source

    Harvested from NASA Data.json

    Other Data Resources

    Additional Metadata

    Resource Type Dataset
    Metadata Created Date February 28, 2024
    Metadata Updated Date May 27, 2024
    Publisher LP DAAC
    Maintainer
    Identifier C2565805847-LPCLOUD
    Data First Published 2024-02-22
    Language en-US
    Data Last Modified 2024-02-22
    Category Terra, geospatial
    Public Access Level public
    Bureau Code 026:00
    Metadata Context https://project-open-data.cio.gov/v1.1/schema/catalog.jsonld
    Metadata Catalog ID https://data.nasa.gov/data.json
    Schema Version https://project-open-data.cio.gov/v1.1/schema
    Catalog Describedby https://project-open-data.cio.gov/v1.1/schema/catalog.json
    Citation Mark Carroll, Charlene DiMiceli, John Townshend, Robert Sohlberg, Alfred Hubbard, Margaret Wooten, Caleb Spradlin, Roger Gill, Savannah Strong, Amanda Burke, Mariana Blanco-Rojas, Melanie Frost. 2024-02-22. MODIS/Terra Land Water Mask Derived from MODIS and SRTM L3 Global 250m SIN Grid V061. Sioux Falls, South Dakota, USA. Archived by National Aeronautics and Space Administration, U.S. Government, NASA EOSDIS Land Processes Distributed Active Archive Center. https://doi.org/10.5067/MODIS/MOD44W.061. https://doi.org/10.5067/MODIS/MOD44W.061.
    Creator Mark Carroll, Charlene DiMiceli, John Townshend, Robert Sohlberg, Alfred Hubbard, Margaret Wooten, Caleb Spradlin, Roger Gill, Savannah Strong, Amanda Burke, Mariana Blanco-Rojas, Melanie Frost
    Harvest Object Id 3e0b5b84-51a2-4d96-836d-9f1ef24e42cb
    Harvest Source Id 58f92550-7a01-4f00-b1b2-8dc953bd598f
    Harvest Source Title NASA Data.json
    Homepage URL https://doi.org/10.5067/MODIS/MOD44W.061
    Metadata Type geospatial
    Old Spatial -180.0 -90.0 180.0 90.0
    Program Code 026:001
    Release Place Sioux Falls, South Dakota, USA
    Source Datajson Identifier True
    Source Hash fce050acb98426bb95ab3230adf2093ce8dba449b04ca0f57a0c3f9b52b0aca5
    Source Schema Version 1.1
    Spatial
    Temporal 2000-01-01T00:00:00Z/2024-05-27T00:00:00Z

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