红外多角度观测的优势分析

Analysis of Advantages of Multi-angle Infrared Observation

常规单一角度热红外谱段观测获得的是像元平均温度,无法区分像元内不同地物的类别信息,导致物理意义模糊不清,在数据应用时无法满足精细地表温度反演的需求。红外多角度遥感数据通过双层能量模型、结合先验知识可以反演混合像元的组分温度(土壤、植被冠层等);可利用不同辐射传输路径获得红外大气透过率的差异,可从图像自身提供的信息反演所需的大气参数,在无大气廓线情况下有效的完成大气校正,减少地表温度反演过程中带来的误差,提高地表真实温度的反演精度;可以获得更为全面的异质异构地表的热辐射状态,避免由于遮挡或者不可见而损失的热辐射信息。另外,红外多角度观测对于更为客观认识地表热辐射状态提供了可能,其在陆表生态系统建模、地表能量平衡研究等方面具有重要科学价值,同时也为热辐射方向性科学探索提供了必不可少的数据支撑。红外多角度光学遥感为热红外遥感数据定量反演提供了有效的手段,是一个重要的发展方向;无论是对工程应用还是对科学研究,红外多角度空间光学遥感器及其应用的研究都有非常重要的意义。

The feature has obvious heat radiation directional characteristics, thermal infrared spectral observations conventional single-angle is obtained pixel average temperature, can not distinguish different categories of information within a cell surface features, resulting in physical meaning obscure in data applications, unable to meet the demand for fine surface temperature inversion. Multi-angle infrared remote sensing data can be as inversion of component temperature of mixed pixel elements（soil, canopy, etc.）. The use of different radi- ation transmission path can obtain the difference of infrared atmospheric transmittance, can provide atmos- pheric parameters needed for information inversion from the image itself, and can complete effectively atmos- pheric correction in the absence of atmospheric profiles, reducing the errors caused by surface temperature in- version process and improving the retrieval accuracy of the real temperature of the surface. A more comprehen- sive heterogeneous surface thermal radiation state can be got to avoid loss of heat radiation information due to invisible or occlusion. In addition, multi-angle infrared observations can get more objective understanding of the status of surface thermal radiation, which has important scientific value in terms of land surface ecosystem construction and surface energy balance studies, but and provide data support which is necessary for scientific exploration in neat radiation directivity. Multi-angle infrared optical remote sensing provides an effective means for the thermal infrared remote sensing quantitative retrieval of data, and is an important direction of development. For both scientific research and engineering applications, multi-angle infrared space optical remote sensor and its application research has very important significance.