Global Mapper also includes the ability to directly
access multiple online sources of imagery, topographic
maps, and gridded terrain data. This includes access
to worldwide high resolution color imagery from
DigitalGlobe (watermarked access for free), detailed
street maps from OpenStreetMap.org, and access to the
entire TerraServer-USA database of USGS satellite
imagery and topographic maps free-of-charge. Global
Mapper also has the ability to easily access WMS data
sources, including built-in access to elevation data
and color imagery for the entire world, and to view
elevation and vector data in true 3D with any loaded
data draped on top of it!
http://www.globalmapper.com/
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