1. A method, comprising: (a) receiving, in a computer, a set of Cartesian data and a set of geodetic data relating to a geographic area; (b) generating a set of control points, each control point being associated with a coordinate expressed in terms of latitude and longitude, and with a corresponding point in the Cartesian data; (c) determining a plurality of sets of Cartesian coordinates for each of the control points, each of the sets of Cartesian coordinates for one of the control points corresponding to a Cartesian system; (d) determining a deviation for a combination that includes a control point and a Cartesian system, the deviation being a difference between coordinates for the point in the Cartesian data and the set of Cartesian coordinates for the control point; (e) for each set of Cartesian coordinates associated with the Cartesian system that is included in the combination, but further associated with a control point not in the combination, modifying the set of Cartesian coordinates according to the deviation; (f) determining a cumulative deviation for the combination by determining a sum of distances of each set of Cartesian coordinates modified in step (e) from the coordinates of the corresponding point in the Cartesian data; (g) repeating steps (e)-(f) for a plurality of combinations; and (h) identifying a combination associated with a minimum cumulative deviation.