2 example locations: Old houses near downtown big cities. These houses have trees that grow very tall due to the time the trees have been around. It makes it harder to see the secondary buildings like garages and sheds. Sometimes it becomes harder to see the primary building of the house due to trees, or the shadows of these trees.

Big new suburb at the edge of the urban crawl. The land was stripped to the grass. The houses have been placed down. Now the satellites goes by and takes images. It is easy to see the outline of the house.

We are in a race against the trees when we map houses using Aerial Data.