Multi-scale remote sensing of microbial mats in an atoll environment
Multi-scale remote sensing of microbial mats in an atoll environment
复制标题
环礁环境中微生物垫的多尺度遥感
DOI：
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发表时间：
2003
期刊：
影响因子：
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通讯作者：
H. Ripley
中科院分区：
文献类型：
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作者：
Serge Andréfouët;E. Hochberg;Claude Payri;Marlin J. Atkinson;F. Muller‐Karger;H. Ripley
在许多沿海环境中都会遇到微生物垫。它们通常由各种微生物发育产生的分层构成。当前的一项研究计划旨在评估南太平洋环礁微生物群落的生物技术潜力。作为该项目的一部分，使用高分辨率 (20-30 m) 多光谱图像（SPOT HRV 和 Landsat ETM+）、高光谱图像（CASI（紧凑型机载光谱成像仪），27 个波段，5.5 2 1 m）和原位反射光谱，对朗伊罗阿环礁（法属波利尼西亚）的垫子特征进行了检查。在环礁尺度上，通过 20-30 m 分辨率多光谱数据的模糊分类/分割，成功地对不同地貌环境中的垫子进行了清查。实验室生化分析（此处未描述）突出并确定了最有前途的垫子的生物技术潜力。这些非凡垫子的光谱特征以两个尺度进行描述。微生物群落的主要反射特征通过四阶导数分析中的峰来识别，区分出由蓝藻裂丝菌属 (Schizothrix sp) 主导的表面层。 （橙色垫），Scytonema sp。 （灰黑色席子）和席藻 sp。 （绿色垫子）。在垫子尺度上，由于混合效应，来自异构 5.5m 2 像素（包括各种微生物群落、植被、沙子和水）的 CASI 衍生光谱特征无法提供垫子之间的精细光学区别。这种多尺度分析提供了光学和地貌标准，以在其他环礁上定位有趣的分层垫。
Microbial mats are encountered in many coastal environments. They are generally constituted by stratified layers produced by the development of various micro-organisms. A current research programme aims to assess the biotechnological potential of the microbial communities in South Pacific atolls. As part of this project, the characterisation of mats was examined in Rangiroa atoll (French Polynesia) using high resolution (20-30 m) multi-spectral images (SPOT HRV and Landsat ETM+), hyperspectral imagery (CASI (Compact Airborne Spectrographic Imager), 27 bands, 5.5 2 1 m) and in situ reflectance spectra. At atoll scale, mats are successfully inventoried among different geomorphological environments by fuzzy classification/segmentation of the 20-30 m resolution multi-spectral data. Laboratory biochemical analysis (not described here) highlighted and identified the most promising mats for their biotechnological potential. The spectral signatures of these remarkable mats are described at two scales. Major reflectance features of the microbial community were identified by peaks in fourth-derivatives analysis, discriminating the surface layers dominated by the cyanobacteria Schizothrix sp. (orange mats), Scytonema sp. (grey-black mats) and Phormidium sp. (green mats). At mat scale, CASI-derived spectral signatures from heterogeneous 5.5m 2 pixels including various microbial communities, vegetation, sand and water did not provide fine optical distinctions between mats because of mixing effects. This multi-scale analysis provides optical and geomorphological criteria to locate interesting stratified mats in other atolls.