Strange Stuff On Aerial Photography

I've seen a lot of strange stuff on aerial photography and recently I've picked up two whilst digitising footpaths in the Hawkesbury local government area.

Lawn Maintenance

"Aliens" or drunk person on a lawn mower.

The 1 in 100 Flood Event

If the flood rises (and it will) these brand new houses are screwed.

Cross hatching

I dont know what's going on here. Are they laying down pipes under the field for storm water detention or just replacing the grass?

aerial photography, interpretation, pattern recognition, funny