Description

Data represents surface water occurrence frequency (percentage), which describes the frequency for each grid appeared as water in the 30 years time period of 1991 to 2020. The data covers Canada’s entire landmass including all transboundary watersheds, and is at 30-meter spatial resolution. The surface water occurrence frequency is derived using the surface water model of Wang et al. (2023) from all-available monthly water data observed by the Landsat satellites (Pekel et al., 2016). Here, permanent waters are represented by 100%, and permanent land surfaces by 0%, of water occurrence for a 30-meter by 30-meter grid. References: Pekel, J.-F., A. Cottam, N. Gorelick, A.S. Belward, 2016, High-resolution mapping of global surface water and its long-term changes. Nature, 540, 418-422. Wang, S., J. Li, and H. A. J. Russell, 2023, Methods for Estimating Surface Water Storage Changes and Their Evaluations. Journal of Hydrometeorology, DOI: https://doi.org/10.1175/JHM-D-22-0098.1.

Resources

Name	Format	Description	Link
Surface Water Frequency Maps of Canada from 1991-2020	TIFF		https://datacube-prod-data-public.s3.ca-central-1.amazonaws.com/store/water/surface-water-frequency/canada-water-frequency-1991-2020-percentage.tif
STAC API	HTML		https://datacube.services.geo.ca/api/collections/surface-water-frequency
Surface Water Frequency Maps of Canada from 1991-2020	WCS		https://datacube.services.geo.ca/ows/surface-water-frequency?service=WCS&request=GetCapabilities
Surface Water Frequency Maps of Canada from 1991-2020	WMS		https://datacube.services.geo.ca/web/surface-water-frequency.xml?request=Getcapabilities&service=WMS&version=1.3.0&layers=frequency&legend_format=image%2Fpng&feature_info_type=text%2Fxml
Surface Water Frequency Maps of Canada from 1991-2020	WMS		https://datacube.services.geo.ca/web/surface-water-frequency.xml?request=Getcapabilities&service=WMS&version=1.3.0&layers=frequency&legend_format=image%2Fpng&feature_info_type=text%2Fxml

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