Bathymetry of Lakes and Reservoirs

Product Bathymetry

General

The bathymetry product is computed within the process of estimating time series of volume variations. The hypsometric curve is derived from water levels from satellite altimetry and surface areas from optical imagery. This allows us to estimate a water level for each surface area, respecively land-water based. Finally, the resulting bathymetry above minimum surface area is computed by stacking all valid land-water masks. Example of Bathymetry The right figure shows the bathymetry for Ray Roberts Lake as an example. It is available for heights above 189.13m.

Processing Strategy

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

Data Holding

DAHITI currently provides 60 data sets of bathymetry distributed over all continents, except Antarctica. In Africa (4 data sets), Asia (2), Australia (1), Europe (4), North America (42), and South America (7) water occurrence masks are available. The bathymetry data setsin DAHITI are freely available and can be downloaded after a short registration process. The amount of bathymetry data sets is permanently increasing.

Data Versions

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

Data Format

The bathymetry is stored as GeoTiff. The spatial resolution is 0.0001° which is about 10m.

user@dahiti:/> gdalinfo  bathymetry.tif
Driver: GTiff/GeoTIFF
Files: 10146_bathymetry.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:
  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=3901x1 Type=Float32, ColorInterp=Gray

Citation

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