Content: General | Processing Strategy | Data Holding | Data Versions | Data Formats | Citation


The product of the water occurrence mask is created in the processing of the surface area time series. It is used for filling of remaining data gaps caused by voids, clouds or snow. However, it can also provide important information for hydrological applications since it contains information about water occurrence of a lake or reservoir since the 1980s. An exemplary water occurrence mask is shown for Ray Roberts Lake in the right figure.

Example of water occurrence mask
Processing Strategy

This product is estimated within the processing strategry of surface areas for lakes and reservoirs. Therefore, more information can be found here.

Data Holding

DAHITI currently provides 190 water occurrence masks distributed over all continents, except Antarctica. In Africa (10 time series), Asia (9), Australia (1), Europe (5), North America (158), and South America (7) water occurrence masks are available. The water occurrence masks in DAHITI are freely available and can be downloaded after a short registration process. The amount of water occurrence masks is permanently increasing.

Data Versions

This product is processed in the processing chain of surface areas.
More information can be found here.

Data Format

The water occurrence mask is stored as GeoTiff. The spatial resolution is 0.0001° which is about 10m.

user@dahiti:/> gdalinfo  water_occurrence_mask.tif
Driver: GTiff/GeoTIFF
Files: water_occurrence_mask.tif
Size is 3901, 2713
Coordinate System is:
        SPHEROID["WGS 84",6378137,298.257223563,
Origin = (-97.178600000000003,33.577800000000003)
Pixel Size = (0.000100000000000,-0.000100000000000)
Image Structure Metadata:
Corner Coordinates:
Upper Left  ( -97.1786000,  33.5778000) ( 97d10'42.96"W, 33d34'40.08"N)
Lower Left  ( -97.1786000,  33.3065000) ( 97d10'42.96"W, 33d18'23.40"N)
Upper Right ( -96.7885000,  33.5778000) ( 96d47'18.60"W, 33d34'40.08"N)
Lower Right ( -96.7885000,  33.3065000) ( 96d47'18.60"W, 33d18'23.40"N)
Center      ( -96.9835500,  33.4421500) ( 96d59' 0.78"W, 33d26'31.74"N)
Band 1 Block=3901x1 Type=Float32, ColorInterp=Gray

Description of pixel values:

Pixel value Description
0 - 100 Percentage of Water Occurrance