Hi, I have a few questions about using the hydrology toolset in ArcGIS.
Thank you.
if the reservoirs are nodata, then you will have to assign them a reasonable elevation appropriate with the surrounding terrain. This can be accomplished with a combination of IsNull and Con as described in the link. Obviously a value of 1 meter would pretty well make it a deep sink in most parts of the world.
Thanks Pat, that's pretty helpful.
However, when I used the IS NULL tool, areas which the were identified as sinks and have no data values actually have data in the DEM.
Would you know why Sink tool identify them as sinks with no data?
Thank you.
look at the Nibble tool to fill those areas in.