1. A method, performed by a computer system, the method comprising: generating, by a processor associated with the computer system, a visual model of a document that includes a geographic signal; identifying, by a processor associated with the computer system, a hierarchical structure of the document based on the visual model; segmenting, by a processor associated with the computer system, the document based on the hierarchical structure and the visual model of the document; and associating, by a processor associated with the computer system, a portion of the document as corresponding to the geographic signal, when the portion includes the geographic signal and when the portion is within a lowest level of the hierarchical structure that includes the geographic signal.