If you have a paid (pro) version of Sketchup you can do it rather easily by the following steps. If you don't have Sketchup Pro, you can get a 30-day free trail that might just get your project done at least. This may sound complicated but if you know how to use Sketchup and Revit pretty well already this won't be difficult at all.
In Sketchup:
New file
File --> Geo-Location --> Add Location
Enter coordinates, address, etc. and select the area you want, click "Select Region" and then "Import"
Note: By default the tag (layer) for the 3D object (Location Terrain) is turned off, so all you see is the flat version (Location Snapshot). Turn the Terrain tag on, and the Snapshot tag off.
File --> Export --> 3D Model, select .DWG file type and select which characteristics you want. (this is the secret sauce because .dwg is only available in the trial, or paid versions)
In Google Earth Pro (log in with your Google Account if prompted)
Zoom to the location you entered in Sketchup Geo-Locate
In the Layers panel (bottom left corner by default) turn off all the clutter, places, roads, etc.
File --> Save --> Save Image, and a little tool bar shows up under the top tool bar.
Select "Maximum Resolution" --> Save Image
In Revit:
Manage --> Materials
In the material editor find an existing material that is very simple, like a paint color or something without any spectral aspects, bump maps, etc. but has an image on the Generic table under Appearance (this part is important). Select the material, right-click, and select "Duplicate Material and Assets", and rename it to something easy to find later.
Select the new material, then the Appearance tab, then click whatever image was there before and browse to the file you saved from Google Earth. Make sure all of the boxes are un-checked (Reflectivity, Bump, Tint, etc.).
Don't worry about the sample size yet, we'll come back to that.
Go to or create and open a 3D view in Revit.
Insert --> Link CAD, change file type to .DWG and browse to the file you exported from Sketchup. By default the units should be inches, but you may have to experiment a little to make sure it comes in at the right size you intend.
Create a Toposurface (v2023) or Toposolid (v2024) by selecting the imported .DWG object.
Once you create the Topo object, delete the imported .DWG object (or plan on hiding it everywhere).
Go to a plan view that shows the entire toposurface and measure it in both X and Y directions. Write it down.
Go back to your material editor and open your new material you made.
On the Appearance tab, click the thumbnail of your image and it will open the Texture Editor. If not already expanded, click "Transforms" to show Position, Scale, etc. In the Scale field, you want to de-select the icon that locks the proportions (looks like links of chain). Now enter the X Y dimensions you got from previous step. Click done/Ok, etc. to get back to your model.
Select the Toposurface/solid and in the properties window find "Material" and click the "..." and find your material you just made in the Material Editor.
Change your Graphic Display Options to "Realistic" and you should see the image "draped" onto your terrain.
The attached image is rendered in Enscape, but the image also shows nicely on the terrain just fine in Revit as well.
I hope this helps someone!
