Questions about DEM data from ASTER

Discussion created by wileyhk2001 on Nov 28, 2013
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?