This rather beautiful looking Google Maps mashup shows bathymetry data for the Sacramento-San Joaquin Delta. The map uses a colour scale to show the depth of the delta on the map.
It is possible to add a map overlay from the National Oceanic and Atmospheric Administration. The map also has a feature to draw a line across a section of the map and view an elevation chart for that section.
Via: Mapperz
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For more details on this see my post. I am also working on adding more data available from NOAA.
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