The example shown above is a DOQQ, and is one of the better ones I could find without an overlay . . . which probably isn't saying much. As you can see, it is a raster-based image that has been compressed to become a 2D map. In other words, it is a combination of a picture of an area and a map of the same area. The one shown is off of a software website, and the original users did not bother to mark it. It is actually 17 overlain DOQQs.
Where example was found: http://www.goldensoftware.com/products/didger/didgernew.shtml
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