【摘要】 由于冠层叶片群体效应,在1km的空间尺度上遥感获取浓密植被陆面温度与气温近似相等。根据这个原理对利用遥感手段获取气温进行了尝试,提出利用NDVI-Ts空间获取气温的方法,计算气温空间分布模式,同时对Prihodko和Goward提出的气温遥感获取模型(简称P-G模型)进行试验并与NDVI-Ts空间法进行了对比。根据Parton和Logan提出的气温尺度转换模型,利用气象站观测最高气温和最低气温获取Terra卫星过境时刻气温作为“测定值”,对遥感获取的气温进行检验,得到以下结论:P-G模型计算气温与观测结果相比偏高,而NDVI-Ts法计算结果偏低,但是其总体误差范围相当,大约为+4℃;与P-G模型相比,尽管NDVI-Ts空间法获得的气温在精度上对P-G模型没有多大的改善,但这种方法能够更加充分利用遥感获取的信息,而且在计算机运算效率上也有很大的改进,NDVI-Ts空间法相对于P-G模型具有一定优势。更多还原

【Abstract】 Because of the colony effect of leafs in canopy, the complex mixture of sunlit, partly shaded and fully shaded leafs causes the phenomenon that radiant temperature for dense canopy are equal to the air temperature approximately. And based on the fact, we try to retrieve the air temperature from combined reflected solar and emitted terrestrial radiation with NDVI-T_s space. The air temperature at the time of satellite passing through was estimated from the maximum and minimum air temperature measured in situ with Parton & Logan model and we still named it as "measured" air temperature. Then the results from NDVI-T_s space and P-G method were validated with "measured" air temperature. The results showed that: the air temperatures estimated from remotely sensed image with P-G model were higher and the ones from NDVI-T_s space were lower than "measured" averagely. But the remotely sensed air temperature estimated from the two methods is all with about +4℃ error compared with the "measured" air temperature. Although the NDVI-T_s space method doesn’t improve P-G model from the error scale, the NDVI-T_s space method is superior to P-G model because the former has used the remotly sensed infomation much fully than P-G model and has higher operation efficiency.更多还原