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首页> 外文期刊>Journal of Geophysical Research. Biogeosciences >Analysis of simulated advanced spaceborne thermal emission and reflection (ASTER) radiometer data of the Iron Hill, Colorado, study area for mapping lithologies
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Analysis of simulated advanced spaceborne thermal emission and reflection (ASTER) radiometer data of the Iron Hill, Colorado, study area for mapping lithologies

机译：分析科罗拉多州铁山研究区的模拟先进星载热发射和反射（ASTER）辐射计数据，以绘制岩性图

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The advanced spaceborne thermal emission and reflection (ASTER) radiometer was designed to record reflected energy in nine channels with 15 or 30 m resolution, including stereoscopic images, and emitted energy in five channels with 90 m resolution from the NASA Earth Observing System AM1 platform. A simulated ASTER data set was produced for the Iron Hill, Colorado, study area by resampling calibrated, registered airborne visible/infrared imaging spectrometer (AVIRIS) data, and thermal infrared multispectral scanner (TIMS) data to the appropriate spatial and spectral parameters. A digital elevation model was obtained to simulate ASTER-derived topographic data. The main lithologic units in the area are granitic rocks and felsite into which a carbonatite stock and associated alkalic igneous rocks were intruded; these rocks are locally covered by Jurassic sandstone, Tertiary rhyolitic tuff, and colluvial deposits. Several methods were evaluated for mapping the main lithologic units, including the unsupervised classification and spectral curve-matching techniques. In the five thermal-infrared (TIR) channels, comparison of the results of linear spectral unmixing and unsupervised classification with published geologic maps showed that the main lithologic units were mapped, but large areas with moderate to dense tree cover were not mapped in the TIR data. Compared to TIMS data, simulated ASTER data permitted slightly less discrimination in the mafic alkalic rock series, and carbonatite was not mapped in the TIMS nor in the simulated ASTER TIR data. In the nine visible and near-infrared channels, unsupervised classification did not yield useful results, but both the spectral linear unmixing and the matched filter techniques produced useful results, including mapping calcitic and dolomitic carbonatite exposures, travertine in hot spring deposits, kaolinite in argillized sandstone and tuff, and muscovite in sericitized granite and felsite, as well as commonly occurring illite/muscovite. However, the distinction made in AVIRIS data between calcite and dolomite was not consistently feasible in the simulated ASTER data. Comparison of the lithologic information;produced by spectral analysis of the simulated ASTER data to a photogeologic interpretation of a simulated ASTER color image illustrates the high potential of spectral analysis of ASTER data to geologic interpretation. [References: 33]
机译：先进的星载热发射和反射（ASTER）辐射计旨在记录15个或30 m分辨率的9个通道中的反射能量（包括立体图像），并从NASA地球观测系统AM1平台记录5个90 m分辨率的通道中的发射能量。通过对已校准的，注册的机载可见/红外成像光谱仪（AVIRIS）数据和热红外多光谱扫描仪（TIMS）数据重新采样到适当的空间和光谱参数，为科罗拉多州Iron Hill的研究区域生成了模拟的ASTER数据集。获得了数字高程模型来模拟ASTER派生的地形数据。该地区的主要岩性单元是花岗质岩石和铁矿质，其中注入了碳酸盐岩储层和相关的碱性火成岩。这些岩石被侏罗纪砂岩，第三纪流纹凝灰岩和冲积沉积物局部覆盖。评价了几种绘制主要岩性单元的方法，包括无监督分类和光谱曲线匹配技术。在五个热红外（TIR）通道中，将线性光谱解混和无监督分类的结果与已发布的地质图进行比较，结果显示主要岩性单元已标测，但TIR中未测绘具有中度至稠密树木覆盖的大区域数据。与TIMS数据相比，模拟的ASTER数据在镁铁质碱性岩石系列中的判别力稍差，并且碳酸盐未映射到TIMS或模拟的ASTER TIR数据中。在九个可见和近红外通道中，无监督分类没有产生有用的结果，但是光谱线性解混和匹配的过滤技术都产生了有用的结果，包括绘制钙质和白云质碳酸盐岩暴露量，温泉矿床中的钙华，乳化的高岭石中。砂岩和凝灰岩，以及绢云母化的花岗岩和长铁矿中的白云母，以及常见的伊利石/白云母。但是，在AVIRIS数据中方解石和白云石之间的区别在模拟的ASTER数据中并非始终可行。由模拟ASTER数据的光谱分析与模拟ASTER彩色图像的光地质解释所产生的岩性信息的比较说明了ASTER数据的光谱分析对地质解释的巨大潜力。 [参考：33]

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