Google Earth Imagery Updates
Tuesday, October 5, 2010
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.