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About
Dr Mike J Smith
Kingston University
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Google Earth Imagery Updates
The Google Earth blog is one well worth monitoring for useful titbits. This recent post explains how often imagery is updated. This is a crucial point as it is not always obvious what the currency is and how the "patch work" of dates varies. They note a policy of trying to keep all imagery less than 3 years old, although this isn't always possible. Don't forget that they store (historic) archive imagery and also provide a KML file showing where the updates are. Useful stuff.
[/remote_sensing]
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