I have a NASA BlueMarble tile layer that goes from zoom factors 0-8. I when I go to zoom level 9, I do see a momentary scaling to 9 (stretching pixels). But then, as expected, I get the errorTileUrl. Nothing wrong here. But rather than have to created the tile cache (and massive data store) for zoom factors 9-14 or so, how would one go about having those zoom factors be pixel scaling and stretching?
This would be very useful for my offline maps.
(BTW, any suggestions for how to store offline tile caches? Say 2K to 4K of tiles in PNG format? Would I use an app manifest? (web application)?