A new service from Yahoo Maps, MapMixer lets you overlay your own map images on top of Yahoo Maps. The idea is that you can add your own maps with additional detail and information on top of Yahoo Maps, with the overlay map’s opacity being adjustable to set how visible your map is relative to the underlying Yahoo Map. The site has tools to help you align your map geographically, but it works best with maps in the geographic or Mercator projections. Here’s a sample showing a map of the USC campus with building names laid on top of Yahoo Maps; use the slider at the upper right to set the overlay opacity:


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