Ahh! I think I got the solution. I had been importing the jpeg as an image instead of as a texture. But I had not context-clicked and made it a projected texture. Even when I did this I then forgot to re-sample the image with the eyedropper tool.
It now appears fine.
But, I swear that last week it worked well by importing the jpeg as an image and then some combination of grouping /ungrouping / sampling allowed me to use the paint bucket and it worked.
Above your terrain, create a single plane of geometry, the same size or a bit larger than the terrain.
Paint the plane with the texture.
Edit the texture transparency so you can see through it to the terrain below.
Set the camera in Top View and Parallel Projection.
Position the texture in relation to the terrain as needed. Position Texture Tool — SketchUp Help
When the texture is in the proper position, right context click on the face > Texture > Projected
Turn off hidden geometry.
Smooth the terrain if necessary. It must be a Surface … Not individual Faces. Soften Edges Dialog Box— SketchUp Help
Open the terrain group for editing.
Note your texture on the plane above is grayed out when you open the terrain group for editing.
No worries … the texture is still there.
Sample the projected texture with the Paint Bucket + Alt
Click the paint Bucket tool on the surface of the terrain.
Close the terrain group.
Done.
Watched every video available, including most of Sketchup’s, and was literally pulling my freakin’ hair out trying to find what I had missed – so frustrated!!! Then, on 3rd day, took one more shot, and found this explanation. SO SIMPLE and right on the mark!!! Maybe I’m still dense, but at least I’m now moving forward again, and will never forget this solution. THANK YOU!
As a guess it looks like you have applied the texture to a closed group rather than the actual surface.
But without seeing your model we can only guess.
One question, when using a high resolution image it seems to downgrade the quality, I downloaded a tool that can split up the image into tiles. Will it work to pick only each tile and project it down one tile at a time?
Those two images in the gif are textures with Projected on (and are Jpeg’s).
If you look again at the first gif I showed you, you will see that in the first phase there are Images, and then I right clicked > explode and they turned into textures.