1. A computer-implemented method of evaluating a characteristic or trait prtesent at and in the vicinity of a geographic location from plural, initially non-georeferenced maps that depict the characteristic or trait being evaluated and other related data and that have been georeferenced, which comprises: (a) constructing a virtual bounding box around each inset of the maps; (b) defining a virtual rectangular geographic grid system covering the total area covered by the maps; (c) for each grid rectangle that intersects an inset bounding box, tracing the inset enclosed by the bounding box to determine if there is intersection of the grid rectangle and the inset; (d) if there is intersection of a grid rectangle and an inset, adding the identity of the inset to a list associated with the grid rectangle; (e) geocoding the location of the geographic location; and (f) examining the insets contained in the list associated with the one grid rectangle containing the geocoded location, and, using the data thereon, performing the evaluation.