1. A method comprising the following computer-executable acts: automatically locating a digital image, the digital image being a candidate map of a geographic region; automatically determining whether or not the digital image is a map of a geographic region, wherein automatically determining whether or not the digital image is a map of the geographic region comprises: extracting text from the digital image; comparing the extracted text with a database of known points of interest for the geographic region to locate matches between the extracted text and the known points of interest for the geographic region; and determining whether or not there is spatial correspondence between the extracted text in the digital image and matched known points of interest, wherein the digital image is determined to be a map of the geographic region if and only if there is spatial correspondence between the extracted text in the digital image and the matched known points of interest; and if the digital image is determined to be a map of the geographic region, automatically generating correlation data that correlates the digital image with a reference map that includes the geographic region.