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Get To Know Google Earth - Historical Imagery

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Released as part of Google Earth 5.0, Historical Imagery is an amazing feature. As I mentioned a few days ago with the Britain from Above story, Historical Imagery is certainly one of the best new features added to Google Earth in the past few years.One interesting aspect of historical imagery is that it's not always old -- sometimes the "historical" imagery for a particular location might be newer than the base imagery. The key is that the imagery for the base layer of Google Earth is always what they consider to be the best imagery for that location. Freshness certainly plays into that, but so does lighting, cloud cover, etc. Quite often, Google will capture new imagery for a location but decide it isn't good enough for the base layer and will put it in the Historical Imagery layer instead.The new Google Earth 5 has a great new feature letting you turn back the clock on aerial/satellite imagery. Here's an example looking at the building of the Beijing National Stadium (also known as the "Bird's Nest") built for the 2008 Beijing Olympics.

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