蒸發散量(Evaportranspiration)為水資源估算中重要的一項，台灣以往在水資源的研究中，單純以固定測站的觀測結果應用到整個研究集水區，並無法反映出集水區的實際狀況，近年來，由於遙測技術的進步，已經開始有學者開始討論利用衛星遙測來估算集水區區域蒸發散的方法，遙測計算蒸發散的方法不僅可以應用於廣泛範圍的估算，同時也可以考慮到集水區內非均值的地表特性，因此，本研究目的探討以衛星遙測估算蒸發散量之應用，並比較各氣象因子對蒸發散量估算結果之影響。
　　本研究主要利用NOAA AVHRR衛星影像來估算蒸發散量，首先將影像資料經過雲霧剔除處理，再藉由地面觀測資料建立推估所需氣象資料，並採用Modified Penman、Penman-Monteith及Priestley-Taylor方法探討台灣西半部各氣象站蒸發散量的估算結果，結果發現以Penman-Monteith法最適合遙測資料估算蒸發散量，並討論以遙測估算與地面觀測資料推估蒸發散量之誤差，同時比較各氣象因子對估算結果之影響，結果發現遙測與地面資料估算結果相近，而估算誤差主要來自淨輻射量的影響。最後，將此方法應用於基隆河流域，並考慮不同地表覆蓋下的折算係數，配合SPOT衛星影像完成之土地覆蓋分類結果，配合折算係數資料，即可獲得此流域的實際蒸發散量，此種利用NOAA AVHRR影像估算蒸發散量之方法將可以做為相關人員在水資源管理及調配上的參考依據。

　　Evapotranspiration is one of the important items of water resources. Pervious researches were only applied the stationary observation to the whole catchments in Taiwan. But these point data cannot reveal the real distribution of evapotranspiration. Recently, the satellite remote sensing technology has been wildly developed. Many scholars aimed to estimate evapotranspiration by using satellite remote sensing (RS). By using RS, this method has two advantages. First is the estimation of extensively area, and the second is the consideration of heterogeneous in the basin. Therefore, this study will explore the estimation of evapotranspiration by using satellite RS, and compare the influence from meteorological factors of evapotranspiration.
　　NOAA AVHRR satellite images were used to estimate the meteorological factors of potential evapotranspiration. By using the NOAA images, it is necessary to filter off the cloudy pixels. Then these cloud free data were used to estimate meteorological factors of evapotranspiration. Three different evapotranspiration methods, Modified Penman method, Penman-Monteith method and Priestley-Taylor Method, were used to compare with the observed data from station at west Taiwan. The results reveal that Penman-Monteith method with RS data has the higher agreement in estimating evapotranspiration. By comparing the evapotranspiration calculation with RS and observed meteorological data, the results reveal that both of these two methods have the approximate estimation. To analysis the sensitivity of meteorological factors, the net radiation has the most sensitivity factor to influence the estimation. As the actual evapotranspiration is the product of potential evapotranspiration multiplied by conversion coefficient of land cover in the Keelung River basin are classified by using SPOT image. The method by using NOAA AVHRR images to estimate actual evapotranspiration is suitable for water resource management.

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