ABSTRACT

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 [14, 18] 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 images are used for studying the Earth’s surface and it bolsters spatial resolution. This chapter discusses effects of temperature on actual evapotranspiration using satellite image.