SPOT数据反演地物辐射亮度和反射率的基础研究

以往用户对于SPOT卫星数据的应用主要针对其高空间分辨率的特性,但是因SPOT卫星传感器的波段数和波长范围有限,故利用SPOT数据进行定量遥感分析(如地物辐射亮度及反射率)的应用研究较少。然而,利用SPOT数据进行地物辐射亮度和反射率的测量也有其高空间分辨率的优势,可以更精细地分辨各类地物的细节,降低混合像元对于定标分析的影响,提高定量遥感分析的准确度。本文将就SPOT数据的辐射校正原理及其在反演地物辐射亮度和反射率方面的应用开展基础性研究,对于SPOT卫星数据的定标参数读取提供了相应的方法,选取了几种比较典型的地物进行数据分析,并利用Landsat-7数据作为参考,评价SPOT数据测量地物辐射参数的可靠性和应用效果。

Study on Inversion of Radiance and Reflectivity with SPOT Data

In the earlier application of SPOT data, the research and application are mainly focused on the higher spatial resolution. Study on inversion of radiometric parameters of ground objects (such as radiance and reflectivity) was little, because the band number and bandwidth of sensor restrict the application in the fields of radiometric calibration and quantification of remote sensing. However, using SPOT high spatial resolution data can distinguish the ground objects efficiently in detail and improve the accuracy of radiometric calibration and quantification of remote sensing. This article discusses about the theory of SPOT data radiometric calibration and its application to the inversion of the radiance and reflectivity of ground object, and retrieval of radiometric calibration parameters. Some typical sample areas are selected to analyze, and Landsat-7 data are used to validate the feasibility and reliability of the inversion.