1.      Add both DEMS and hillshades to map so you can visually identify changes in the landscape.

2.      Using the Geoprocessing pane, search for Stack Profile (3D Analyst Tools).

3.      Click the pencil icon to the right of the dropdown under Input Line Features and select Line.

4.      Click the drop down under Profile Targets and select both DTMs.

5.      Using the hillshades as a guide, draw a line across the feature whose elevation you would like to analyze.

6.      Click Run.