It's awefully small... It does look like a post-it-note, but imagine how large the photos must be in comparison. If a post-it-note appears that small, then they must be shpping millions of photos...
Also, it's in line with the edges of that property, and it has small marks on it. I think it's just a barn. Maybe the owner has a bad taste in color.
it looks like the shadow is curved because I think the building has a slight arc to the roof. That or the land has a slight indentation on the west side. If you look at the buldings to the east, their shadows also point west.
Satellite Problems 
ROTFL!!!!!!!!
"TO-DO: Remove packing tape before shipping images to Google server."
Also, it's in line with the edges of that property, and it has small marks on it. I think it's just a barn. Maybe the owner has a bad taste in color.
it looks like the shadow is curved because I think the building has a slight arc to the roof. That or the land has a slight indentation on the west side. If you look at the buldings to the east, their shadows also point west.
OK, someone needs to organize a Thai road trip to solve this once and for all. :)
http://maps.google.com/maps?ll=16.266289,103.356596&spn=0.004515,0.007522&t=k&hl=en
More yellow. :)
I think it's just roofing, probably for the heat, as you said.