Stack/overlay 3D surfaces in Surfer

You can both stack and overlay multiple 3D surface maps in Surfer. Stacking maps aligns the map frames according to their XY coordinates, so they are still two independent and separate maps. You can control the vertical separation when stacking maps. Overlaying puts both surface layers into the same map frame, so the surfaces are oriented correctly relative to each other and they use the same set of axes. The vertical separation between overlaid surfaces depends on their Z values.

To stack 3D surface maps in Surfer, vertically move them to the desired spacing, then select them all and click Map Tools | Map Tools | Stack Maps. This will align them by their X and Y coordinates. You do need to have multiple map frames selected for this command to be active.

 A few notes when stacking 3D surfaces:

1. The map view properties should be the same for all maps. For example:
   1. Select Map in the Contents window for one of the 3D surfaces.
   2. Click Home | Clipboard | Copy Format.
   2. Select the other maps you want to stack and click Home | Clipboard | Paste Format.
2. The maps are stacked according to their XY coordinates, so the surface maps need to be in the same coordinate system.

To overlay 3D surfaces in Surfer, select them all and click Map Tools | Map Tools | Overlay Maps.  

Updated December, 2021