3D polygons for landform reconstruction

[GrahamDriver]

Hello, 

I have a DTM of a glacier and it's surrounding terrain and I'm trying to reconstruct the past glacier volume and size. Is there a way I can create a 3D polygon that sits flush to the bottom of the glacier (the DTM) and slopes so I can use it to estimate mass and volume loss? 

I'm new to the 3D side of things with ArcPro and was wondering if this could be done?

Here's a terrible diagram showing what I am trying to get at...

[David_McRitchie]

Hey Graham I would recommend checking the following page as it lists some useful geoprocessing tools that could be used for this workflow.

I think drawing a large polygon over your DTM layer, assigning a Z value to this so that it sits ontop then running the Surface Volume tool should achieve this.

Hope that helps!

David