Application of Landsat Satellite to Regional Temperature Mitigation Effect

• Main Author: 簡文煥
• Other Authors: 陳莉
• Format: Others
• Language: zh-TW
• Published: 2004
• Online Access: http://ndltd.ncl.edu.tw/handle/83374582666380418413

碩士 === 中華大學 === 土木工程學系碩士班 === 92 === In order to maintain the normal growth of paddy rice, it has to maintain a certain depth of water in the field during stages of active growth, such as transplanting, splitting, etc. The evaporation and transpiration from the paddy field absorb the heat in the air and land surface, thus reduce the temperature in the neighborhood and possess the function of mitigating surface temperature in the community. In order to study the quantity of temperature mitigation, the thermal bands of two Landsat-7 satellite images dated in May 28, 2002 and May 31, 2003, were used to derive the surface temperature in Taoyuan and Shinchu areas. The surface temperature distribution was created based on physical model, and its correlation with major land covers was analyzed. The result shows that the effect of temperature mitigation is as follows: 1. The surface temperature in the Taoyuan area was 1.2℃ higher in 2002 than in 2003, while the temperature of paddy fields was 0.2 ℃ higher in 2002 than in 2003. 2. Surface temperature of rice paddy was 6.6 ℃ lower than those of buildings and roads, and 2.6 ℃ lower than bare soil and uncovered ground in Taoyuan area in 2002, while it was about 7.2 ℃ lower than buildings and roads, and 8.3℃ lower than bare soil and uncovered land in 2003. 3. The surface temperature in the Shinchu area was 1.5℃ higher in 2002 than in 2003, while the temperature of paddy fields was 1.6 ℃ higher in 2002 than in 2003. 4. Mean surface temperature of rice paddy was 7.7 ℃ lower than those of buildings and roads, and 4.3 ℃ lower than bare soil and uncovered ground in Shinchu area in 2002, while it was about 10.1 ℃ lower than buildings and roads, and 8.3 ℃ lower than bare soil and uncovered land in 2003. 5. The surface temperature was 26.3 ℃ for land set-aside in 2003 in Gobei work group of Shinchu Irrigation Association, which is 3.0 ℃ higher than the same area with cultivated land in 2002. Buffer analysis suggested that the surroundings were affected by the amount of 1.7 ℃ within the extent of 300 m and 1.3 ℃ within 600 m and 1.2 ℃ within 1,000 m.