How to get the elevation data for water bottoms from DEM data?

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11-27-2013 06:19 PM
WileyNg
New Contributor II
I downloaded the ASTER global DEM from the following website:
http://gdex.cr.usgs.gov/gdex/
And I found out that whenever there is water bodies the DEM data looks bumpy and I think it doesn't reflect the actual elevation for the river/lake bottoms.

How can I get the elevation for the river/lake bottoms. i read that from some website that i should overly a different dataset (TIN?) onto the DEM data? where should I get that?
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