Is there a way to detect if the map contains "No image available" tiles?

I looked through the API and couldn't find any clues. The problem I'm trying to address is this: The user sets the map to Aerial mode and zooms in on a rural area in China. But beyond a certain zoom level, she finds the "No image available" tiles. Instead, we'd like to automatically switch the map view to Road mode. Any ideas how this can be done?

-Tim

[560 byte] By [TimChan] at [2007-12-27]

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