摘要
从70年代开始，遥感技术获得了突飞猛进的发展，地球资源卫星获得的大量遥感图像中包含着有关地球表面、海洋表面等的大量信息，因此利用遥感图像卫星资料来研究地面及目标的光学特性（热红外的反射率、辐射度及反射特性、温度及随时间的变化），是一种极其有应用价值的方法和手段。NOAA／AVHRR2有5个通道，通道1和通道2位于可见光波段，用于观测可见光的反射太阳能，通道4和通道5是位于10～12μm的热红外通道，用于探测地面、海面及目标的辐射信息。通道3兼有上述两种特性，是一个比较复杂的通道。我们仅选用了通道4和通道5的遥感卫星图像进行了研究，从黑体辐射公式出发，反演出传感器的探测温度Td，并对其进行了传感器定标校正、温度的大气校正，从而得到比较精确的表面温度Ts。同时利用双红外通道4和5相关度大的特性，对其进行了组合，用回归统计分析法进行了反演精度比较。研究结果表明，本文的技术和方法可以进行大面积区域目标特征的提取，把传统的点研究推广到面的研究。
Remote sensing teclinique has made rapid progress since 70's,a procedure estimation of sea surface temperature was developed by using thermal infrared data. Earth-data Remote Sensing Satellite image includes earth surface and sea surface data so using this kind of data to study surface and object's optical feature (thermal infrared reflectivity, radiation, temperature and the changes with the time) is the most valuable method. NOAA/AVHRR2 has five channels, channel 1 and channel 2 lie in the visible-wave band to survey the reflected radiation of the Sun, channel 4 and channel 5 lie in 10~2eμm thermal infrared wave band to survey Earth, Sea and object's radiation. Channel 3 is a complicated channel taking account of the two features above-mentioned. We only use the satellite image of the channel 4 and channel 5, based on Planck formula to counter-deduce the temperature of the sensor, then correct the affect by the air. At the same time using inter-relationship between 4 and channel 5, we compared the precision with the standard data by regression method, Results show that the technique and method providing in this paper can be used to study wide area features of the object.
出处
《光电子技术与信息》
1998年第5期16-20,共5页
Optoelectronic Technology & Information
