I want to calculate/draw the boundary extent in Glacier valley with the help of DEM.

Can you please guide me which is the best tools in ArcGIS and steps to calculate.

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    @Ateeq Can you give us a little more detail. For example what is the source and resolution of the DEM? To do what you are looking to do, you may need a high quality DEM like one generated by LiDAR. It's hard to say without more information. – WhiteboxDev Oct 3 '14 at 0:25
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    Are you interested in delineating the glacier using manual editing/drawing? Using a DEM thresholding technique? Or, possibly, are you looking for an automated delineation approach (e.g. supervised classification)? – Aaron Oct 6 '14 at 4:34

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