APPLICABILITY AND DISUCUSSION ON THE NDVI-EVAPOTRANSPIRATION LINEAR RELATIONSHIP

Abstract

Relationship between evapotranspiration and NDVI is discussed using the single layer model with physical process in the Natori River basin. A new algorithm is developed to make cloud free images of NDVI in time series. Distributions of albedo, wind speed, and interception are involved in the single layer model, which provides evapotranspiration distribution to compare with NDVI. As the results, the correlation coefficient of evapotranspiration estimated by the single layer model and the liner relationship method is more than 0.9, some regions having low and high NDVI do not have good agreements, and the applicable time period of the linear relationship is more than 1 month. Totally, the liner relationship can make us satisfy the estimation of evapotranspiration distribution.