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机载AISA EagleⅡ传感器为“黑河综合遥感联合试验(HiWATER)”额济纳旗试验区提供航空高光谱影像。介绍了高光谱原始数据的辐射定标、几何校正、大气校正等预处理过程。根据研究区地形差异以及数据使用目的的多样性,几何校正中可选择是否加高精度DEM产品,大气校正的选择策略可分为平坦地形无DEM的大气校正和起伏地形添加DEM大气校正。本试验数据采用加载高精度DEM的几何校正和平坦地形大气校正方法,经过预处理后的高光谱数据产品,其地理坐标与高分辨率的CCD影像对比,地理位置信息较为准确;与实测地物光谱对比,影像光谱能较好地体现地物光谱的特性,数据可用作定量遥感进一步的研究。
The airborne AISA Eagle II sensor provides aerial hyperspectral images for the “HiWATER” Ejinaqi pilot area. The preprocessing of radiation calibration, geometric correction and atmospheric correction of hyperspectral raw data is introduced. According to the topographic differences in the study area and the diversity of data usage purposes, the DEM product can be selected for geometric correction. The selection strategy for atmospheric correction can be divided into atmospheric correction for flat terrain without DEM and atmospheric correction for undulating terrain. The experimental data are loaded with the geometric correction of the high-precision DEM and the atmospheric correction method of the flat topography. After the pre-processed hyperspectral data products, the geographical coordinates are compared with the high-resolution CCD images, and the geographical location information is more accurate; Spectral contrast, image spectroscopy can better reflect the characteristics of feature spectrum, the data can be used as a quantitative remote sensing further research.