Land-Water Masks of Lakes and Reservoirs

Product Land Water Mask

General

This product contains land-water masks which are computed in the approach for estimating surface area time series. In all land-water mask, remaining data gaps caused by voids, snow or clouds are filled by using the long-term water occurrence mask. Example of Land-Water Mask In the right figure, an example of a filled land-water mask is presented for Ray Roberts Lake.

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 180 land-water masks distributed over all continents, except Antarctica. In Africa (5 time series), Asia (3), Australia (1), Europe (5), North America (155), and South America (7) water occurrence masks are available. The land-water masks in DAHITI are freely available and can be downloaded after a short registration process. The amount of land-water 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 land-water masks are stored as GeoTiff. The spatial resolution is 0.0001° which is about 10m.

user@dahiti:/> gdalinfo  2018-12-27.tif
Driver: GTiff/GeoTIFF
Files: 2018-12-27.tif
Size is 3901, 2713
Coordinate System is:
GEOGCS["WGS 84",
    DATUM["WGS_1984",
        SPHEROID["WGS 84",6378137,298.257223563,
            AUTHORITY["EPSG","7030"]],
        AUTHORITY["EPSG","6326"]],
    PRIMEM["Greenwich",0],
    UNIT["degree",0.0174532925199433],
    AUTHORITY["EPSG","4326"]]
Origin = (-97.178600000000003,33.577800000000003)
Pixel Size = (0.000100000000000,-0.000100000000000)
Metadata:
  AREA_OR_POINT=Area
Image Structure Metadata:
  COMPRESSION=LZW
  INTERLEAVE=BAND
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=3901x2 Type=Byte, ColorInterp=Gray
  NoData Value=255

Description of pixel values:

Pixel value Description
0 Land pixel
1 Water pixel

Citation

Find more topics on the central web site of the Technical University of Munich: www.tum.de