필지 중심 토지정보시스템의 구축에 따른 유형별 오류 분석에 관한 연구

필지중심 토지정보시스템 구축을 위한 지적자료 오류를 분석했다.

It is essential to convert existing cadastral maps into digital form to construct the database of a Land Information System and to computerize the land records. For this conversion, the standard rules of converting cadastral maps into digital data must be established and the solutions for expected problems of this conversion should be prepared. Also, performance critera of equipments for effective input and output systems must be proposed for acquirement of the systems. The input and the output systems and the rules of this conversion for the Land Information System should be designed and customized practically to be adequate to our society's need.

Especially, 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 rules of conversion of cadastral maps into digital form and present status of cadastral maps were analyzed. Also planning strategy and process of conversion of the cadastral maps were illustrated. Also, methods of combining of attributes to the graphical data, structural editing and inspection of the digitalized cadastral data were proposed and analyzed.

The rules of converting cadastral maps into digital form were attached in the appendix. Current methods for correction of the expansion-shrinkage problem of the cadastral maps were analyzed a new method was developed. The current method is using the 4 cornet 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 the computer source codes of this new method are listed in the appendix. And the criteria of errors in terms of map scales and methods of map join is proposed. As the alternative ways of correcting mismatch of the maps, when the proposed new method does not produce the matching errors below tolerance, usage of the large scale orthophotos, the digital basemaps and the conventional surveying method were studied.

Finally, performances of the input and the output equipments(common LIS/GIS equipments and currently used equipments in cadastral offices) for conversion of cadastral maps into digital files were investigated. Besides, the standards of the equipments for orthphoto manufacturing and fartherly to be used for the reform of the cadastral maps were proposed.