Questions about DEM data from ASTER

Discussion created by wileyhk2001 on Nov 28, 2013
Latest reply on Dec 1, 2013 by wileyhk2001
Does ASTER DEM data also capture some of the buildings by mistakes/ by chance?

I was looking at the raster i downloaded from ASTER but I found out that some part of the data is weirdly high, which should abnormal in a floodplain.

Also, how to obtain elevation data of the Riverbed if the DEM surface is capturing the water surface level?
or no, how are the other ways of getting the river cross-section?