A New Distortion Correction Method for the Maps of Public Land of Korea

Abstract

There are about 800,000 map sheets for 36,500,000 parcels of land of Korea. They have been used for almost 100 years with the known problems of the shrinkage-expansion of the paper cadastral maps. The area of a parcel is recorded in a cadastre, and the maps are used just as a reference drawing for the location and the shape of the land. However, digitization of the maps began to reveal the problem of distortion of the map as the conflict between the areas on the cadastre and the digital maps was shown in numerical form. The distortion problem is tried to be resolved in this paper. Using the fact that original maps drawn on the plane tables in the years of 1910 to 1918 have grid lines and have been preserved well, a strategic flow was developed, which applies the refinement techniques to the digital maps with the original maps as controls. Several types of distortions and corrections were simulated, and errors between an error-free map and the distortion corrected map were evaluated. The RMS errors in the corrected digital maps were allowable, thus, the method developed in this study was applicable for the digital cadastral maps.