1. A computer-implemented method for providing an overhead image browsing user interface, the computer-implemented method comprising: under control of an overhead image viewing system comprising computing hardware including one or more processors: receiving user input specifying a geographic region of interest; in response to the user input, outputting for display (1) a master image of the geographic region of interest, and (2) a representation of one or more overhead images, wherein the overhead images correspond to the geographic region of interest; and responding to user selection of one of the representations of the overhead images by outputting for display the selected overhead image superimposed over a geographically-corresponding portion of the master image.