고해상도 항공사진을 이용한 4대강 하천구역 내 토지이용변화 분석 -낙동강 유역을 사례로 = Analysis of Land Use Change within Four Major River Areas Using High-Resolution Air-Photographs: The Case of the Nakdong River Basin

항공사진과 지적도를 이용해 하천구역의 토지이용 변화를 분석했다.

Landuse changes and cadastral information error categories in the four major river areas were analyzed for the use of policy data as cadastral re-arrangement of national and public lands would be required, using high-resolution air-photographs and cadastral maps before and after the river development. The study sites were the river areas of 40km around four dams of the Nakdong river where their landuses were changed most. As the results, national and public lands reached 79.9% of land parcels and 93.3% of land areas of the study sites similar with those of the four river areas, 84.3% of land parcels and 85.5% of land areas.

The landuse classification of the study sites before the four river development was consisted most of ‘river’(71.6%) and ‘rice field’(12.3%), but after the development the ‘river’ was reduced to 42.7% and ‘park area’(19.6%) including sport fields and ‘mixed lots’(20.8%) were increased. Also, 86.7% of land parcels before the development could be reduced after the development if administrative districts and land ownerships were not considered. Cadastral information error categories can be found as cadastral polygon missing, polygon overlap, location and boundary non-coincidence, small polygon generation, and non-coincidence between cadastral boundary and river boundary.

Landuse change monitoring method using air-photographs will be useful to analyze landuse state through fast information aquisition and to manage properties of national and public lands such as river areas.