지적도면의 수치화를 위한 신축오차 보정에 관한 연구 = A study on the expansion-shrinkage correction for cadastral map computerization

다국어 초록 (Multilingual Abstract)

It is essential to convert existing cadastral maps into digital form to construct the database of a Land Information System. For this conversion, the development of a new method of the expansion-shrinkage correction for the paper maps and the practical study to lead to the solution of disagreement in joining the digitally converted maps, are necessary.
In this study, theoretical basis of the main phases related to the present status of cadastral maps were analyzed. Also planning strategy and process of conversion of the cadastral maps were illustrated. Current methods for correction of the expansion-shrinkage problem of the cadastral maps were analyzed and a new method was developed. The current method is using the 4 corner points of the border lines as the control points for the transformation. Whereas, the new method is using the grid points overlayed on the original cadastral maps. Thus this method made the distortion be corrected locally.
To test performance of the new method, a couple of sample cadastral data were generated, distorted and then corrected by the new method. The corrected data were compared to the originally generated data and the RMS error of ±0.3mm was obtained, which is within the error allowance for digital cadastral maps.