You can stack 3D surface maps by selecting them both and clicking Map Tools | Map Tools | Stack Maps. You do need to have both map objects selected for this command to be active.
Two things to take note of when stacking 3D surfaces:
- The map view properties should be the same for both maps. For example:
- Select Map in the Contents window for one of the 3D surfaces.
- In the Properties window, note the Projection, Rotation and Tilt values on the View page.
- Then select Map in the Contents window for the other 3D surface.
- In the Properties window, on the View page, make sure it has the same Projection, Rotation and Tilt values.
- Then select both Map objects (click one, hold CTRL on the keyboard, and click the other) and click Map | Stack Maps.
- The maps are stacked according to their XY coordinates, so both surface maps need to be in the same coordinate system.
Another option is to overlay the maps (select them both and click Map Tools | Map Tools | Overlay Maps). Stacking maps simply aligns the maps according to their XY coordinates. However, they are still two independent and separate map objects. Overlaying puts both surface layers into the same map object, so the surfaces are oriented correctly relative to each other and they use the same set of axes.
Updated October 25, 2017