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In the water cycle, evapotranspiration is one of the most important components, but it is one of the most difficult to measure and monitor. Evapotranspiration relates to the exchange of energy in the atmosphere, ground surface, and root zone. Some elements of calculated evapotranspiration can be measured by weather stations, while others are estimated from empirical equations. Then, the calculated evapotranspiration has some inaccuracy. To improve upon this problem, the combination of meteorological data and remote sensing observersions are an alternative evapotranspiration approach. (Hongjie et al., 2002; Kalluri et al., 2003) On the other hand, temperature is normally measured in a number of weather stations. Since temperature relates to many weather data, temperature can imply the characteristic of other weather data. For example, low temperature is included high humidity but low evaporation can be occurred in the condition of low temperature. Moreover, the variable spatial resolution is the characteristic of both actual evapotranspiration and temperature. At present, satellite image are used for studying the Earth's surface and it bolsters spatial resolution. Then, the purpose of this study is to determine the effect of temperature on actual evapotranspiration using satellite image. Evapotranspiration occurs from evaporation and transpiration, and it can be obtained from weather data and satellite images. Evaporation is the primary process of water transfer in the hydrological cycle. The water is transformed into vapour and transported into the sky. Evaporation can be classified into potential evaporation and actual evaporation. The potential evaporation is defined as the amount of evaporation that would occur if a sufficient water source were available. On the other hand, the actual evaporation is the amount of water which is evaporated a normal day. The potential evaporation is the maximum value of the actual evaporation. Transpiration is included by the vaporization of liquid water contained in plant tissues and the vapor removal to the atmosphere. (Hongjie et al., 2002; Kalluri et al., 2003) Evapotranspiration is normally computed from the PenmanMonteith FAO 56 equation using weather data. This equation is affected by principal weather parameters such as radiation, air temperature, humidity and wind speed. These parameters can be measured by weather station and computed by the equation of FAO irrigation and Drainage Paper No. 56 (Allen et al., 1998). In addition to the PenmanMonteith FAO 56 equation, evapotranspiration can be estimated from the concept of energy

The Effect of Temperature on Actual Evapotranspiration based on Landsat 5 TM Satellite Imagery