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利用模拟数据,评价Autonomous Atmospheric Compensation(AAC)算法的抗噪性,认为AAC算法的抗噪性较弱。基于TASI实测数据,利用AAC算法开展反演计算时,计算结果呈现出多样性问题。结合In-scene Atmospheric Compensation(ISAC)算法中黑体像元的标定方法,提出了一种复合改进算法。首先,利用ISAC算法反演的大气透过率和路径辐射,重新计算AAC算法中大气透过率之比(Tr)和相邻两强弱吸收通道的路径辐射之差(Pd),再次,运用经验公式获得稳定的大气反演结果(大气透过率和路径辐射),有效解决了计算结果多样性的问题。利用复合改进算法,开展的温度与发射率分离实验,证明反演得到的发射率波谱更接近野外实测波谱。 相似文献
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甘肃龙首山铀成矿带是中国内陆一条重要的铀成矿带。芨岭铀矿床是龙首山成矿带中典型的碱交代型铀矿床,蚀变种类繁多,且与铀矿化关系密切,利用航空高光谱技术可以从宏观上获取芨岭铀矿床地表蚀变、构造、岩性分布信息,为芨岭矿床及周边铀多金属矿产勘查提供依据。本文采用CASI/SASI/TASI航空高光谱遥感技术,对甘肃龙首山地区芨岭碱交代型铀矿区及周围地表出露的热液蚀变进行了研究,识别出了碱性长石、赤铁矿、透闪石、中铝绢云母、高岭石、石英（硅化）等与碱交代热液作用演化密切相关的蚀变矿物,并将蚀变矿物与构造、岩性等要素进行了综合分析。研究表明,碱性长石、透闪石、中铝绢云母和石英（硅化）等蚀变矿物分别代表了芨岭及周围地区碱交代热液作用过程中早期碱交代、中期中性交代、晚期酸性交代等不同演化阶段的热液蚀变作用;芨岭铀矿区碱交代热液作用的主要通道是区域不整合面、深大断裂、不同岩性接触带的复合体,马路沟铀矿控矿断裂的芨岭矿区段明显发育透闪石、中铝绢云母、硅化与碱交代作用相关的热液蚀变。根据芨岭铀矿床的航空高光谱遥感特征,提出了龙首山碱交代型铀矿找矿的主要预测判据。这些判据对龙首山的铀矿找矿新区预测和老矿点、异常点的新评价具有重要的意义。 相似文献
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Thermal infrared remote sensing (8–12 μm) (TIR) has great potential for geologic remote sensing studies. TIR has been successfully used for terrestrial and planetary geologic studies to map surface materials. However, the complexity of the physics and the lack of hyperspectral data make the studies under-investigated. A new generation of commercial hyperspectral infrared sensors, known as Thermal Airborne Spectrographic Imager (TASI), was used for image analysis and mineral mapping in this study. In this paper, a combined method integrating normalized emissivity method (NEM), ratio algorithm (RATIO) and maximum–minimum apparent emissivity difference (MMD), being applied in multispectral data, has been modified and used to determine whether this method is suitable for retrieving emissivity from TASI hyperspectral data. MODTRAN 4 has been used for the atmospheric correction. The retrieved emissivity spectra matched well with the field measured spectra except for bands 1, 2, and 32. Quartz, calcite, diopside/hedenbergite, hornblende and microcline have been mapped by the emissivity image. Mineral mapping results agree with the dominant minerals identified by laboratory X-ray powder diffraction and spectroscopic analyses of field samples. Both of the results indicated that the atmospheric correction method and the combined temperature–emissivitiy method are suitable for TASI image. Carbonate skarnization was first found in the study area by the spatial extent of diopside. Chemical analyses of the skarn samples determined that the Au content was 0.32–1.74 g/t, with an average Au content of 0.73 g/t. This information provides an important resource for prospecting for skarn type gold deposits. It is also suggested that TASI is suitable for prospect and deposit scale exploration. 相似文献
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