| Title |
A Study on a GIS based Updating Methodology of Landcover Maps for the Enhancement of Utilization in the Total Maximum Daily Loads |
| Authors |
곽근호 ( Geun Ho Kwak ) ; 김계현 ( Kye Hyun Kim ) ; 이철용 ( Chol Young Lee ) ; 오성광 ( Seong Kwang Oh ) |
| DOI |
https://doi.org/10.15681/KSWE.2014.30.3.340 |
| Keywords |
Geographic Information System; GIS; Landcover Map; Nonpoint Source Pollution; Total Maximum Daily Loads; TMDL |
| Abstract |
Recently, TMDL has been implemented to estimate the amount of pollutant loads and to establish proper mitigation strategy to decrease the pollutant loads by the Ministry of Environment. To estimate the amount of pollutant loads with reasonable accuracy, securing landcover map with periodically updating is essential. However, in reality, due to the technical and financial difficulties, the landcover map has not been updated annually. Hence, this study mainly aims to suggest an effective GIS-based updating method in order to promote utilization of landcover map in the estimation of pollutant loads. Bupyeong-gu at the City of Incheon with the total area of 31.98 km2 was chosen for this study and spatial data including digital topographic maps, ortho aerial photo, and satellite images were collected and utilized. A total of 7,235 feature entities were newly produced through the updating process of five steps and it was revealed that the classification of landcover with the total area of 3.34 km2 was to be changed. The validity and feasibility of the suggested method were proved with the accuracy of 97.9% from the field verification. Further study needs to be made for devising more automated method to update landcover map to facilitate TMDL for individual local governments. |