High Quality Content by WIKIPEDIA articles! Microsoft Research Maps or MSR Maps is a free online repository of public domainaerial imagery and topographic maps provided by the U.S. Geological Survey (USGS). The site is a collaboration between Microsoft Research (MSR), Bing Maps, and the USGS. It has been under continuous operation since June 1998. It had 30,000 to 50,000 visitors per day as of January 2010. The site was renamed in 2010, prior to which it was known as TerraServer-USA (formerly Microsoft TerraServer).