The specification of surface vegetation is essential for simulating actual evapotranspiration of water resources. The availability of land cover maps based on remotely collected data makes the specification of surface vegetation easier. The spatial resolution of hydrologic models rarely matches the spatial scales of the vegetation data needed, and remotely collected vegetation data often are upscaled up to conform to the hydrologic model scale. In this study, the effects of the grid scale of of surface vegetation on the results of actual evapotranspiration were examined. The results show that the coarser resolution causes larger error in relative terms and that a more realistic description of area-averaged vegetation nature and characteristics needs to be considered when calculating actual evapotranspiration.

Abstract
 1. 서 론
 2. 재료 및 방법
 3. 이론적 배경
 4. 결과 및 고찰
 5. 결 론
 감사의 글
 REFERENCES

• 이길하(대구대학교 건설시스템공학과, Department of Civil Engineering, Daegu University) | Lee, Khil-Ha Corresponding author