1. A computer-implemented method of enhancing an image, comprising: receiving an original image having a set of sites; receiving one or more images related to the original image; and for a first site of the set of sites, performing operations comprising: identifying a plurality of candidate labels from the one or more related images; selecting a label for the first site, the label selected from the candidate labels responsive at least in part to evaluating a degree of difference between the label and the first site; and storing an identifier of the selected label in association with the first site, wherein identifying the plurality of candidate labels comprises: identifying a second site partially overlapping the first site; computing an offset between locations of the first site and the second site; identifying a label having a greatest degree of similarity to the second site within one of the one or more related images; and identifying, as a candidate label, a second label within the one of the one or more related images, wherein the second label is offset by the computed offset from the label having the greatest degree of similarity to the second site.