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Google Earth: Google Earth Pro
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Google Earth is a new product that combines satellite imagery, maps and the power of Google Search to put the world's geographic information at your fingertips. Google Earth puts a planet's worth of imagery and other geographic information right on your desktop. You can type in an address and Google Earth will fly to that location. You can get driving directions between locations. You can even tilt and rotate to see 3D buildings in metropolitan areas such as St. Louis.
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Google Earth is a beta product available in a free version, and in licensed versions for commercial use. It is currently only officially available on Microsoft Windows 2000/XP. A Linux versions should be released by end of 2005 but this looks increasingly unlikely. However, a leaked version of working non-public beta of Google Earth for Mac OS X started to appear on the internet on December 08, 2005.
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Google Earth Pro ($400) has broader capabilities than Earth Plus for importing spreadsheet data and for printing in a higher resolution. It ... adds the ability to measure areas and can be extended with a variety of optional modules, such as the "movie making" module.
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Google Earth puts a planet's worth of imagery and other geographic information right on your desktop. View exotic locales like Maui and Paris as well as points of interest such as local restaurants, hospitals, schools, and more. There are three versions of the service available. The basic one is free to download, and will suffice in most cases. There is Google Earth Plus, an optional upgrade adding GPS device support, the ability to import spreadsheets, drawing tools and better printing. For professional and commercial uses, Google Earth Pro is the ultimate research, presentation and collaboration tool for location information.
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Not all the imagery in Google Earth comes from satellites. A lot of the imagery comes from aerial photographers mostly in airplanes with special high resolution cameras. Some of the imagery even comes from kites and balloons. Google acquires imagery from a variety of providers. Some of the imagery is given to Google by city or state governments. The age of the imagery varies greatly, but most of the high resolution imagery is between 6 months and 5 years of age.
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Google Earth is currently offered as a free product; ... two more high-powered versions are available for a fee. The latter two are useful for business applications or for users who own a GPS device.
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Google Earth Pro