A 100 m resolution bathymetric model of Lake Victoria, Africa. The model is
created from approximately 148,600 points collected by a lead line or acoustic
surveys over the 20th and 21st Centuries. The points were either GPS referenced
or manually digitized via a process of fitting admiralty maps to the lake shore-
line using their graticule. All input data are either non-copyright data collect-
ed by our research team or expired UK crown copyright (50+ years old). Points 
were converted to a raster model by a process of simple kriging. The deepest 
portions of the lake may not be captured as the lead line had a maximum reach of
200 ft. in some locations. 

The projection is ESRI: 102024 and the vertical units are meters with a resolu-
tion of 1 m. Data include the ~148,000 bathymetric points, the cross-validation
points, the bathymetric raster pictured above, the kriging settings, a standard
error map, and the respective world files. Please note the three bays of Mwanza
(Tz), Kisumu (Ky), and Port Bell (Ug) contain ~120,000 points with the remaining
~28,000 distributed across the rest of the lake. 

The model will continue to be improved as we capture more data. If you have more
data, then send the data to us for validation and incorporation. Updates can be
found at http://bit.ly/LV_Bathy

Stuart Hamilton
http://www.stuartehamilton.info