DOI: 10.1016/j.jag.2015.03.014
Scopus记录号: 2-s2.0-84943636617
论文题名: Temperature and emissivity separation and mineral mapping based on airborne TASI hyperspectral thermal infrared data
作者: Cui J ; , Yan B ; , Dong X ; , Zhang S ; , Zhang J ; , Tian F ; , Wang R
刊名: International Journal of Applied Earth Observation and Geoinformation
ISSN: 15698432
出版年: 2015
卷: 40 起始页码: 19
结束页码: 28
语种: 英语
英文关键词: Hyperspectral
; Mineral mapping
; TASI
; Temperature and emissivity separation
; Thermal infrared remote sensing
Scopus关键词: airborne survey
; algorithm
; emissivity
; gold
; infrared imagery
; mapping
; mineral exploration
; ore deposit
; remote sensing
; skarn
; spectral resolution
; temperature profile
英文摘要: Thermal infrared remote sensing (8-12μm) (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. © 2015 Elsevier B.V. Citation statistics:
资源类型: 期刊论文
标识符: http://119.78.100.158/handle/2HF3EXSE/79581
Appears in Collections: 气候变化事实与影响
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作者单位: Key Laboratory of Crustal Dynamics, Institute of Crustal Dynamics, China Earthquake Administration, Beijing, China; China University of Geosciences (Beijing), Beijing, China; China Aero Geophysical Survey and Remote Sensing Center for Land and Resources, 31 Xueyuan Road, Haidian District, Beijing, China; Beijing Research Institute of Uranium Geology, Beijing, China; Institute of Crustal Dynamics, CEA, 1 Anningzhuang Road, Haidian District, Beijing, China
Recommended Citation:
Cui J,, Yan B,, Dong X,et al. Temperature and emissivity separation and mineral mapping based on airborne TASI hyperspectral thermal infrared data[J]. International Journal of Applied Earth Observation and Geoinformation,2015-01-01,40