>  Think of  things like visualizing historical change, whether that's
> forest cover over decades, or UAV imagery from a crisis situation over
> a period of days.  

For time series of images to be useful, I could see possible mashups
like the possibility to animate the images or to shove them into a
simple (WPS ?) change detection algorithm (image difference,
ratio ...).  

More generally, I find your idea of having more or less arbitrary images
rather than a reference layer per zoom level interesting.

Cheers,

Yves




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