本研究目的為利用現地觀測與MODIS衛星影像兩種方法推估區域蒸發散，以討論不同估算方法之差異。現地觀測是採用樹液流與土壤含水量觀測，以觀測樹液流的方式計算植物蒸散量，經由葉面積指數進行尺度放大後計算區域蒸散量，再與土壤含水量變化所獲得之蒸發量相加，即為現地觀測的區域蒸發散量值；而衛星蒸發散的方法是利用MODIS衛星影像推估蒸發散公式所需要的氣象因子而來，首先針對衛星影像進行前置處理作業，採用無雲霧干擾之MODIS影像資料估算氣象因子，配合Penman-Monteith法與SEBAL法兩種估算蒸發散方法估算區域蒸發散量，最後再以評鑑指標探討現地區域蒸發散與衛星區域蒸發散量之差異。
研究發現衛星區域蒸發散量均較現地區域蒸發散來的大，首先改進衛星估算葉面積指數的估算方式後，兩者間的差異仍無改進，後續分析發現使用衛星估算的氣象因子有誤差，改以現地觀測資料計算衛星區域蒸發散後，發現有明顯的改善，而且以Aqua MODIS配合Penman-Monteith法估算區域蒸發散的結果與現地區域蒸發散最接近。

The objective of this study proposed herein is to discuss the differences between field experiment and Moderate-resolution Imaging Spectroradiometer (MODIS) images methods by adopting them in estimation of regional evapotranspiration. During the field experiment, sap flow and soil moisture measurements were respectively used to calculate regional transpiration (derived by scaling up Leaf Area Index) and evaporation which were then combined to provide regional evapotranspiration of field experiment. On the other hand, regional evapotranspiration of satellite remote sensing as proposed in this study was estimated by plugging meteorological factors into the calculating equation of Penman-Monteith and SEBAL methods. Above all, the detection and removal of cloud and haze in satellite images is necessarily proceeded. Finally, we used evaluation indicators to analyze the diversity of regional evapotranspiration between field experiment and satellite remote sensing.
Results of this study indicated that the estimation result of satellite remote sensing has higher regional evapotranspiration than field experiment does. In order to compensate the bias between the two calculating results, the study intended to change the procedure of estimating Leaf Area Index estimation from satellite remote sensing first, but resulted in no significant improvement due to the existing deviation from meteorological factors of satellite remote sensing. Then, we found out that regional evapotranspiration would show more improvement if we replace meteorological factors of satellite remote sensing with field experiment data. For better accuracy of regional evapotranspiration, it is highly suggested to estimate regional evapotranspiration applying Aqua MODIS with Penman-Monteith method.

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