MODIS/Terra Land Water Mask Derived from MODIS and SRTM L3 Global 250m SIN Grid V006

Description

The MOD44W Version 6 data product was decommissioned on July 18, 2024. Users are encouraged to use the MOD44W Version 6.1 data product (https://doi.org/10.5067/MODIS/MOD44W.061). The Terra Moderate Resolution Imaging Spectroradiometer (MODIS) Land Water Mask (MOD44W) Version 6 data product provides a global map of surface water at 250 meter (m) spatial resolution. The data are available annually from 2000 to 2015. MOD44W Version 6 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. A primary improvement in Version 6 is the generation of time series data 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 Hierarchical Data Format 4 (HDF4) file are layers for land, water, no data, and an associated per pixel quality assurance (QA) layer that provides users with information on the determination of water. Known Issues * The mask area for pixels outside of the Sinusoidal Grid for tile h27v14 should be labeled as 250 (Outside of Projection) instead of 0 (Land) and the QA values should be 10 (Fill) instead of 3 (Lower confidence land) for years 2000 through 2015. * Additional known issues are described in the User Guide and ATBD. * For complete information about known issues please refer to the [MODIS/VIIRS Land Quality Assessment website](https://landweb.modaps.eosdis.nasa.gov/knownissue?sensor=MODIS&sat=Terra&as=6). Improvements/Changes from Previous Versions * Corrected for errors of many misplaced rivers in South America due to limited spatial resolution of previously used input data. * Improved data in the far northern latitudes. * Water extent provided as a time series that can be used to detect changes between 2000 and 2015. * Increased spatial resolution of 250 m. The Version 5 product was 500 m. * Improved terrain shadows with slope and elevation masking. * Burned areas (scars) delineated.

Resources

Name Format Description Link
5 https://landweb.modaps.eosdis.nasa.gov%2F
5 https://doi.org%2F10.5067%2FMODIS%2FMOD44W.006
5 https://lpdaac.usgs.gov%2F
5 https://lpdaac.usgs.gov%2Fdocuments%2F109%2FMOD44W_User_Guide_ATBD_V6.pdf
5 https://www.earthdata.nasa.gov%2Fcenters%2Flp-daac
5 https://landweb.modaps.eosdis.nasa.gov
5 MOD44W.006 https://doi.org/10.5067/MODIS/MOD44W.006
5 https://www.earthdata.nasa.gov/centers/lp-daac
33 MOD44W_User_Guide_ATBD_V6.pdf https://lpdaac.usgs.gov/documents/109/MOD44W_User_Guide_ATBD_V6.pdf
0 The metadata's original source. https://cmr.earthdata.nasa.gov/search/concepts/C2763298119-LPCLOUD.iso19115

Tags

  • earth-science-surface-radiative-properties-land-surface-reflectance
  • earth-science-surface-water-terrestrial-hydrosphere-surface-water-processes-measurements-total

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