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首页> 外文会议>ISPRS Congress >ANOMALY DETECTION AND COMPARATIVE ANALYSIS OF HYDROTHERMAL ALTERATION MATERIALS TROUGH HYPERSPECTRAL MULTISENSOR DATA IN THE TURRIALBA VOLCANO
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ANOMALY DETECTION AND COMPARATIVE ANALYSIS OF HYDROTHERMAL ALTERATION MATERIALS TROUGH HYPERSPECTRAL MULTISENSOR DATA IN THE TURRIALBA VOLCANO

机译：大鼠火山火山高光谱多传感器数据的异常检测与对比分析

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The aim of this work is the comparative study of the presence of hydrothermal alteration materials in the Turrialba volcano (Costa Rica) in relation with computed spectral anomalies from multitemporal and multisensor data adquired in spectral ranges of the visible (VIS), short wave infrared (SWIR) and thermal infrared (TIR). We used for this purposes hyperspectral and multispectral images from the HyMAP and MASTER airborne sensors, and ASTER and Hyperion scenes in a period between 2002 and 2010. Field radiometry was applied in order to remove the atmospheric contribution in an empirical line method. HyMAP and MASTER images were georeferenced directly thanks to positioning and orientation data that were measured at the same time in the acquisition campaign from an inertial system based on GPS/IMU. These two important steps were allowed the identification of spectral diagnostic bands of hydrothermal alteration minerals and the accuracy spatial correlation. Enviromental impact of the volcano activity has been studied through different vegetation indexes and soil patterns. Have been mapped hydrothermal materials in the crater of the volcano, in fact currently active, and their surrounding carrying out a principal components analysis differentiated for a high and low absorption bands to characterize accumulations of kaolinite, illite, alunite and kaolinite+smectite, delimitating zones with the presence of these minerals. Spectral anomalies have been calculated on a comparative study of methods pixel and subpixel focused in thermal bands fused with high-resolution images. Results are presented as an approach based on expert whose main interest lies in the automated identification of patterns of hydrothermal altered materials without prior knowledge or poor information on the area.
机译：这项工作的目的是TurriaLBA火山（CostaRICA）在多师和多传感器数据中的频谱异常相关的水热改变材料存在的比较研究，来自可见光（VI）的光谱范围，短波红外（ SWIR）和热红外（TIR）。我们用于此目的Hymap和Master Isbore传感器的高光谱和多光谱图像，以及2002年和2010年之间的一段时间内的抗灾和Hyperion场景。采用现场辐射测量以消除经验线方法的大气贡献。由于在基于GPS / IMU的惯性系统中获取活动中的同时测量的定位和方向数据，直接地致直接地理学获得了Hymap和主图像。允许这两个重要的步骤允许鉴定水热改变矿物的光谱诊断带和精度空间相关性。通过不同的植被指标和土壤模式研究了火山活动的环境影响。在火山的火山口中被映射了水热材料，实际上目前活跃，它们的周围进行了分化的主要成分分析，分化为高低吸收带，以表征高岭土，伊利石，三农素和高岭土+蒙胶，划分区域的累积随着这些矿物质的存在。已经在与高分辨率图像融合的热带中的方法像素和子像素的比较研究上计算了光谱异常。结果作为基于专家的方法呈现，其主要利益在没有先前知识或地区信息的情况下的热热改变材料模式的自动识别。

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