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利用ADEOS POLDER多角度遥感数据 ,从统计意义出发 ,对光照与观测角度互易的观察对进行考察 ,发现在POLDER数据中存在不可忽略的不互易现象 ,以文中定义的不互易度来衡量 ,可见光波段不互易度可达 1.0 ,红外波段不互易度可达 0 .3。两个方向上计算NDVI的偏差可达 0 .2。分析了不互易度与NDVI和海拔的相关性 ,发现不互易性与地表的复杂程度有一定的相关性 ,并提出地物光谱反射弱的数据不互易度大的假设。
Using ADEOS POLDER multi-angle remote sensing data, from the statistical significance, we investigate the reciprocity between light and observation angle and find that there is a non-reciprocal phenomenon that can not be neglected in the POLDER data, which is measured by the non-reciprocity defined in the paper , The band of non-reciprocity of the visible light band can reach 1.0, and the non-reciprocity of the infrared band can reach 0 .3. The deviations of the calculated NDVI in both directions are up to 0.2. The relationship between nonreciprocity and NDVI and altitude is analyzed. It is found that there is some correlation between nonreciprocity and surface complexity, and the hypothesis that the data with weak reflectance of the spectrum of the object is not easy to be reciprocal is proposed.