Extensive false positives in rocky desert areas

[authalic]

I'm seeing a large number of false positives, numbering at least 5,000 polygons, in the rocky desert areas of southern and eastern Utah. It appears that large rocks in certain types of geologic formations are being extracted as buildings. I have attached screenshots from the Navajo Nation area in southeastern Utah. All of these images are north of the Utah-Arizona and south of the San Juan River.

In area shown in the image below, building footprints are represented with a yellow outline and a transparent fill. This image shows approximately 1,500 individual footprints:

The area shown is very sparsely populated, with likely no more than a hundred actual buildings. When examined in detail, the errors are apparent:

Large rectangular rock features are being extracted as buildings footprints. Also, areas with no discernible features are being extracted as buildings. For example, this is the area near the Monument Valley Airport has no rocks, but large irregular footprints are present:

Errors like these are present over hundreds of square miles in the rocky desert and mountainous areas of the eastern half of the state. The total number is easily more than 5,000 false footprint polygons. I imagine it's similar in other desert states.