基于TM影像的亮温与地温数据比对分析

Contrastive Analysis of Black-body Temperature and Land Surface Temperature Based on TM Image

亮温与地温是研究城市热岛效应的两个有效指标。在详述基于影像算法反演地温的基础上,以绵阳市建成区为实验区,对比分析了亮温与地温的差异性。结果表明,(1)与亮温相比,地温数据的最大值和最小值均偏大约2K,且二者差值大小主要分布在0.91~2.57K之间,约占总面积的98.06%;(2)以亮温与地温数据为基础划分的热岛区和冷岛区结果相近,通过转移矩阵法研究发现,两种划分结果在空间分布上差异很小,一致性比例达到94.50%。

Black-body temperature(TBB) and land surface temperature(LST) are effective indexes of urban heat island effect. Taking Mianyang City as the study area, based on the IB algorithm of LST, this paper contrastive analyzed the differences between TBB and LST. The results show that(1)the maximum value and minimum value of LST are bigger than TBB's, and the D-value is about 2 K. The D-value distributes among 0.91~2.57 K mainly, and it accounted for about 98.06% of the total area.(2)The classifying results of heat island area and cold island area based on TBB and LST are similar, the difference is small in space, the consistency ratio is about 94.50%.