| 摘要 |
An originally non-georeferenced raster map, which may have resulted from scanning and storing a non-georeferenced paper map, is georeferenced with reference to a georeferenced map, such as a vector map. Points denoting common features, such as road intersections, on each map are captured as point-pairs. When two point-pairs have been captured, a computer system calculates two functions, one converting the x,y coordinates of the raster map to the lat,lon coordinates of the vector map, the other converting lat,lon to x,y. Thereafter, the maps may be viewed simultaneously-top-and-bottom, side-by-side-or quasi-simultaneously, for example, toggling rapidly back and forth. The georeferencing functions are used by the system to effect manipulation of one map as the other map is manipulated. Thus, any manipulation of the vector map-scrolling, zooming, etc,-by a user is mimicked by the raster map. |
