Patent ID: 7190377
Filing Date: 2007-03-13
Classification: G06T

Abstract:
1. A method for georeferencing a raster map, comprising: displaying a first map and a second map, the first map being a digital raster map, having a plurality of pixel locations, and the second map being a previously georeferenced map, having associated geographic coordinates, wherein the first map displays at least a portion of an identical geographic region displayed in the second map, each pixel location includes an associated x-coordinate and y-coordinate, and each geographic coordinate includes an associated longitude coordinate and an associated latitude coordinate; receiving an entry identifying a first point pair, wherein a first pixel location on the first map is associated with a first geographic coordinate on the second map and the first pixel location is located at a position on the first map corresponding to the first geographic coordinate on the second map; receiving an entry identifying a second point pair, wherein a second pixel location on the first map is associated with a second geographic coordinate on the second map and the second pixel location is located at a position on the first map corresponding to the second geographic coordinate on the second map; assigning to the first pixel location the longitude coordinate and the latitude coordinate associated with the first geographic coordinate; assigning to the second pixel location the longitude coordinate and the latitude coordinate associated with the second geographic coordinate; creating a mathematical georeferencing function, based on the first point pair, the second point pair, and a third point pair, for assigning corresponding geographic coordinates to any one of the plurality of pixel locations, wherein the mathematical georeferencing function is based on a linear transformation; and revising the mathematical georeferencing function when a new point pair is received.