【摘要】 单窗算法和单通道算法的提出为应用LandsatTM热波段反演地表温度开辟了新途径。由于进行地面像元尺度同步温度测量难度较大,目前尚无法对这两种算法进行直接评判。通过对算法所需参数分别取一定变动区间并进行渐变取值测算,分析了算法对其参数估计误差的敏感性,以此作为对这两种算法适用性的一个间接评判依据。更多还原

【Abstract】 The advent of the mono-window algorithm(MWA)and single-channel method(SCM)has opened up a new way for retrieving land surface temperature(LST)from Landsat TM thermal band.However,due to the great difficulty of obtaining the in situ ground measurements comparable to the pixel size of Landsat TM6 data at the satellite pass,validation of these two algorithms with the in situ measurements is still not feasible at the present time.In this paper,a sensitivity analysis has been conducted to examine the effects of possible errors in the three parameter(i.e.,ground emissivity “ε”,near-surface air temperature “T 0” and the atmospheric water vapor content “w”)estimations on LST retrievals,thus to provide an alternative way to assess the performance of the two algorithms.The research results show that:(1)both MWA and SCM are not very sensible to the possible errors of ε;(2)MWA is more sensible to the possible errors of w(when T 0 is low)or T 0(when w is high),if compared with the relatively insignificant impact of the possible errors of ε on the retrieved LSTs;(3)as for SCM,the effect of the possible errors of w on the LST retrievals is much greater than that of ε.更多还原