Matching of multi-scale digital raster map using precise geometric correction

In the processing and applying of the digital map, it is one of the key technologies that aligning the maps from different projective coordinate systems to a standard. Using the principium of geometric correction, the paper compared and analyzed three correction models of the raster map, presented the idea of correcting the maps of different scale with corresponsive correction models, and citing a map of certain scale, the author compared the correction effects and errors of three models by programming and proved the accuracy and feasibility of this idea