Global Water Frequency

Data Access
Global Water Frequency Product

The extent of inland water bodies can have a high dynamic due to seasonality and extreme weather events, such as flooding, drought, and late-season snow and ice cover. The inland water frequency dataset delineates water dynamic at both spatial and temporal dimensions by measuring the occurrence of water through a year. It provides a more comprehensive estimation of global water area and changes in compare to static inland water maps.

The Water Frequency (WF) layers contain estimates of the percentage of water occurrence among all valid Landsat observation through the target year. The confidences of the estimates were provided in the error layer. The inland water mapping Algorithm (Feng, et al.2015) was applied for Landsat water mapping. Cloud contaminated observations were identified using FMask ( and excluded.

Code Values
Value Label
0 - 100 Water Frequency
255 No data
How to Cite This Data Set

Citation Format: Author (Publication Date), Collection Name, Product Name, Processing Level, Publisher, Publisher Location, Product Coverage Date.

Data Citation Parameters Example:

  • Author: Feng, Min, Joseph O. Sexton, Saurabh Channan, and John R. Townshend
  • Publication Date: 2015
  • Collection Name: Global Inland Water
  • Version: 1.0
  • Publisher: Global Land Cover Facility, Department of Geographical Sciences, University of Maryland
  • Publisher Location: College Park, Maryland
  • Product Coverage Date: Circa 2000

Associated Peer-Reviewed Publication: Feng, Min, Joseph O. Sexton, Saurabh Channan, and John R. Townshend. 2015. "A Global, High-Resolution (30-M) Inland Water Body Dataset for 2000: First Results of a Topographic-Spectral Classification Algorithm." International Journal of Digital Earth. doi:10.1080/17538947.2015.1026420.

Intellectual Property Rights

University of Maryland; Department of Geographical Sciences; use is free to all if acknowledgement is made. UMD holds ultimate copyright.


Source for this data set is the Global Land Cover Facility,

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