内蒙古本巴图铀资源勘查远景区航空高光谱数据不同大气校正方法评价及应用  

Evaluation and Application of Different Atmospheric Correction Models for Airborne Hyperspectral Data in Benbatu Uranium Resources Exploration Prospect Area, Inner Mongolia

作　　者：张川[1] 叶发旺[1] 童勤龙[1] 郭帮杰[1] 李新春[1] 淦清清 ZHANG Chuan;YE Fawang;TONG Qinlong;GUO Bangjie;LI Xinchun;GAN Qingqing(National Key Laboratory of Remote Sensing Information and Image Analysis Technology,Beijing Research Institute of Uranium Geology,Beijing 100029,China)

机构地区：[1]核工业北京地质研究院遥感信息与图像分析技术国家级重点实验室,北京100029

出　　处：《铀矿地质》2023年第1期101-109,共9页Uranium Geology

基　　金：核能开发项目“基于航空高光谱与伽玛能谱的铀矿勘查技术研究”(编号:[2021] 88);铀资源高光谱遥感智能化勘查关键技术(编号:遥YY2101)联合资助。

摘　　要：航空高光谱遥感在岩石矿物精细识别和填图方面具有显著优势和应用前景。大气校正是实现航空高光谱影像中矿物反射光谱重建的关键技术,现有的大气校正模型方法需进一步评价和开发,以适应地质矿产勘查领域中的实用化需求。文章以内蒙古巴丹吉林盆地东部的本巴图铀资源勘查远景区为试验区,基于4种经典大气校正模型开发了航空高光谱数据大气校正批处理软件,对试验区SASI航空高光谱影像开展大气校正不同方法的试验评价。以试验区5种典型蚀变矿物的反射光谱重建作为评价对象,通过与USGS标准矿物光谱进行对比,结果表明:经过FLAASH模型、6S模型、快速大气校正模型和经验线性模型校正后的SASI影像均能较准确地反映矿物的诊断性光谱特征,吸收峰波长位置未发生明显偏移。相对而言,经验线性法更好地保持了矿物的光谱形态,作为试验区航空高光谱数据大气校正的优选方法。最后,在航空高光谱大气校正的基础上,完成了本巴图铀资源勘查远景区矿物填图,为分析和评价该地区铀成矿潜力提供了技术支撑。Airborne hyperspectral remote sensing has significant advantages in detail identification and mapping of rock minerals. Atmospheric correction is the key technology to realize the reconstruction of mineral reflection spectrum in airborne hyperspectral images. In order to further evaluated and developed the practical use of geological mineral exploration, SASI airborne hyperspectral images in Benbatu uanium resource exploration prospect area in Eastern Badain-Jaran Basin, Inner Mongolia was selected for the test. A batch processing software for atmospheric correction of airborne hyperspectral data was developed to test and evaluate the effects of different atmospheric correction method. The reconstructed reflection spectrum of five typical altered minerals was used as the evaluation objects by comparing with the USGS standard mineral spectrum. The results showed that the SASI images corrected by FLAASH model, 6S model, quick atmospheric correction model and empirical line model can accurately reflect the diagnostic spectral characteristics of minerals, and the wavelength position of absorption peak does not shift significantly. Comparatively, the empirical line method can preserves the spectral shape of minerals better, and it was the preferred method for atmospheric correction of airborne hyperspectral data in the test area. Finally, on the basis of airborne hyperspectral atmospheric correction, mineral mapping of the Benbatu uanium resource exploration prospect area was completed, which provided technical support for the analysis and evaluation of uranium metallogenic potential in this area.

关 键 词：航空高光谱 大气校正 辐射传输 经验线性 矿物光谱 反射率 

分 类 号：P627[天文地球—地质矿产勘探]