We did note several places during the trip that didn't contain bramble. The hotspot in the middle of the residential area was also entirely isolated.

For a proper evaluation you would need to be more methodological but as a sanity-check we were very happy with it.

One other thing to point out about the bramble model is that it is pixel-wise. That is each prediction is exclusively only what is within the 10 metre pixel (give or take the georeferencing error).