System and method for georeferencing maps
First Claim
1. A computer-implemented method of georeferencing an initially non-georeferenced raster map image, comprising the steps of:
- (a) displaying a raster map and a georeferenced map that both depict the same geographic area;
(b) identifying at least two point pairs, each point pair comprising one point on the raster map and one point on the georeferenced map, each point of a point pair lying on the same geographic feature on both maps;
(c) with the use of the raster image coordinates of each point on the raster map and the geographic coordinates of the corresponding point on the goereferenced map, determining the functional relationships between the image coordinates and the geographic coordinates;
(d) thereafter, for each additional corresponding point-pair that is identified (i) revising the functional relationships between the image coordinates and the geographic coordinates according to the additional point pairs, and (ii) disregarding any points which are substantially inconsistent with the functional relationships.
1 Assignment
0 Petitions
Accused Products
Abstract
After FEMA paper flood maps are scanned into a computer system, they are each displayed side-by-side with the relevant portion of a stored vector map covering the geographic area covered by all of the FEMA maps. During display, corresponding points, or “point-pairs,” on each map are marked by a keyboard or mouse device. The corresponding points may be such artifacts as roads, stream beds, railroad tracks, intersections of the foregoing, buildings, mountain peaks, etc., which are identifiable on each displayed map. When two point-pairs are marked, a stored algorithm calculates georeferencing functions which permit translation of the x,y coordinates of the raster map to the latitude,longitude coordinates of the vector map and vice versa. As more point-pairs are marked, the georeferencing functions are refined. Another algorithm removes apparent “bad” points from the georeferencing calculations, which points may re later used if it appears that they are not bad.
196 Citations
30 Claims
-
1. A computer-implemented method of georeferencing an initially non-georeferenced raster map image, comprising the steps of:
-
(a) displaying a raster map and a georeferenced map that both depict the same geographic area;
(b) identifying at least two point pairs, each point pair comprising one point on the raster map and one point on the georeferenced map, each point of a point pair lying on the same geographic feature on both maps;
(c) with the use of the raster image coordinates of each point on the raster map and the geographic coordinates of the corresponding point on the goereferenced map, determining the functional relationships between the image coordinates and the geographic coordinates;
(d) thereafter, for each additional corresponding point-pair that is identified (i) revising the functional relationships between the image coordinates and the geographic coordinates according to the additional point pairs, and (ii) disregarding any points which are substantially inconsistent with the functional relationships. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15, 16, 17)
-
-
18. A computer system for georeferencing an initially non-georeferenced raster map image, comprising:
-
(a) a monitor for displaying a raster map and a georeferenced map that both depict the same geographic area;
(b) first facilities for identifying at least two point pairs, each point pair comprising one point on the raster map and one point on the georeferenced map, each point of a point pair lying on the same geographic feature on both maps;
(c) second facilities that use of the raster image coordinates of each point on the raster map and the geographic coordinates of the corresponding point on the goereferenced map, for determining the functional relationships between the image coordinates and the geographic coordinates;
(d) third facilities for, after each additional corresponding point-pair is identified, revising the functional relationships between the image coordinates and the geographic coordinates according to the additional point pairs, while disregarding any points which are substantially inconsistent with the functional relationships. - View Dependent Claims (19, 20, 21, 22, 23, 24, 25, 26, 27, 28, 29, 30)
-
Specification