摘要
在热红外光谱区域,假设非同温平面混合像元的发射率为r-emissivity,那么它的辐射温度是随波长变化的。以典型的由土壤和植被组成的非同温平面混合像元为例,分析了非同温对其辐射温度的影响,并给出体现辐射温度变化的可能的方法。利用模拟的热红外高光谱数据对该方法进行了验证,验证结果表明,该方法能够较好地刻画非同温平面混合像元辐射温度随波长的变化,提高了非同温平面混合像元r-emissivity的反演精度。
In the thermal infrared spectral region, the radiometric temperature of flat non-isothermal mixed pixel varies with the wavelength if we assumed that its emissivity can be represented by r-emissivity. The typical flat non-isothermal mixed pixel composed of soil and vegetation is taken as an example, analyzing the non-isothermal effects on the radiometric temperature of the pixel, and giving a possible method to present the variation of radiometric temperature change. In order to validate the method, simulated hyper spectral thermal infrared dataset is generated. The validation results show that the method can characterize the change of flat non-isothermal mixed pixel with wavelength well and improve the inversion precision of r-emissivity of flat non-isothermal mixed pixel.
出处
《大气与环境光学学报》
CAS
2008年第1期57-64,共8页
Journal of Atmospheric and Environmental Optics
基金
国家自然科学基金(40501042
40401042
40671139)
中国科学院知识创新工程重要方向性项目(KZCX3-SW-334
KZCX3-SW-338-2)
国家重点基础研究发展项目(2007CB714400)
关键词
非同温混合像元
温度
发射率
热红外
遥感
non-isothermal mixed pixel
temperature
emissivity
thermal infrared
remote sensing