HJ-1B卫星三种反演地表温度模型的分析与验证

Analysis and verification of three models for land surface temperature retrieval from HJ-1B satellite

由于对不同的传感器,单通道算法中的经验公式必须根据相应的热红外波段特征重新进行拟合,该文以覆盖广州市的卫星影像HJ-1B/CCD和HJ-1B/IRS为数据源,利用基于同步面上像元尺度的多源遥感数据MOD021KM,并结合上下行辐射和地表比辐射率来反演大气水汽含量以及大气透射率。在此基础上,针对环境卫星,提出修正的普适性单通道算法、大气辐射传输方程算法和单窗算法3种模型,进行广州市地表温度反演,最后利用野外观测数据进行验证。结果表明,相比普适性单通道算法和单窗算法,辐射传输方程模型精度比较高。

This article used the synchronous multi-source remote sensing data on the pixel scale MOD021 KM to invert atmospheric moisture content and the atmospheric transmissivity,combined upward and downward long wave radiation and the surface emissivity based on HJ-1B/CCD and HJ-1B/IRS data sources of Guangzhou HJ satellite images.On that basis,three models including generalized single-channel algorithm,modified radiative transfer equation algorithm and mono-window algorithm for HJ-1Bsatellite were used to invert the land surface temperature of Guangzhou City.Experimental result showed that the precision of radiative transfer equation algorithm would be higher than that of the other two.