I think some are just differnt colours, because the satillite images are composed of various photos put together, taken at differnt times, so they
don't all match. Same with the zoom levels, some of the photos are higher res than others. For example, i can Zoom all the way when looking at some
areas in Vancouver, but go east of there a bit and i can't zoom in that far. They just don't have high res photos of everything.


