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研究背景漂流木在海岸生态系统中扮演着重要角色,既能拦截泥沙、保护沙丘,也能为动物栖息和植被生长提供条件。然而,漂流木常因影响海滩景观而被清理,因此,如何准确识别其分布,成为海岸带生态监测与管理的重要课题。遥感技术为地表材料识别与海岸环境监测提供了有效手段。无人机凭借高空间分辨率和灵活的采集方式,为海滩精细化调查创造了条件,但目前漂流木遥感研究仍主要集中于河流、湖泊等环境,针对海滩场景的高光谱识别研究相对有限。针对这一问题,法国佩皮尼昂大学CEFREM研究团队结合地面光谱测量与无人机高光谱影像,分析漂流木与其他地表材料的光谱差异,并比较多种分类算法的识别表现,为高光谱技术应用于海滩漂流木监测提供了研究依据。图1.研究区域的地理位置、漂流木堆积物的详细测绘图,以及本研究部分内容所用裁剪图像的范围界定。此外,还包括漂流木与芦竹样方照片,以及背景中可见的自然海滩漂浮物堆积线。研究方法研究区域:本研究位于法国南部地中海沿岸的La Crouste海滩,研究团队于2024年11月开展了两类数据采集工作;数据采集:地面光谱测量使用ASD FieldSpec 4地物光谱仪配合接触式探头完成,测量前用Spectralon白参考板定标;利用无人机搭载高光谱相机获取高光谱影像;FieldSpec 4 Hi-Res NG地物光谱核心参数:光谱范围:350-2500nm;光谱分辨率:3nm@700nm;6nm@1400/2100nm;数据输出通道数:2151;波长重复性:0.1nm;数据处理:研究团队对无人机高光谱影像进行校正,结合地物光谱测量分析不同地表材料的光谱特征,并利用10种监督分类算法识别漂流木,以MCC等指标评价分类效果。同时,通过遗传算法筛选特征波段,并结合影像裁剪与空间后处理,评估植被干扰、波段数量及空间信息对识别结果的影响。图2.所研究材料的反射光谱:(a) 全波段ASD野外光谱(3...
发布时间: 2026 - 10 - 26
浏览次数:9
DETECTION OF SUGARCANE AFRICAN STALK BORER ELDANASACCHARINA WALKER (LEPIDOPTERA: PYRALIDAE) USINGHYPERSPECTRAL REMOTE SENSING (SPECTRORADIOMETRY)应用ASD地物光谱仪检测蛀虫ELDANA SACCHARINA(鳞翅目:螟蛾科)对非洲甘蔗茎部的危害程度MOKHELE TA1, AHMED F1and CONLONG DE2,31School of Environmental Sciences, University of KwaZulu-Natal, Durban, 4041, South Africa2South African Sugarcane Research Institute, Private Bag X02, Mount Edgecombe 4300, South Africa3School of Biological and Conservation Sciences, University of KwaZulu-Natal, Private Bag X01, Scottsville, 3209, South AfricaAbstractThe South African sugar industry is one ...
发布时间: 2015 - 08 - 06
浏览次数:273
LGR氧化亚氮同位素分析仪测量水中硝酸盐成功案例:Analytical Chemistry 文章:Combining Denitrifying Bacteria and Laser Spectroscopy for Isotopic Analyses (δ15N, δ18O) of Dissolved Nitrate通过反硝化细菌和激光同位素分析仪测定溶解硝酸盐中的δ15N和δ18ODavid X. Soto *†, Geoff Koehler †, and Keith A. Hobson †† Environment Canada, 11 Innovation Boulevard, Saskatoon, Saskatchewan, Canada, S7N 3H5AbstractWe present a novel approach for nitrogen (δ15N) and oxygen (δ18O) isotopic analysis of nitrate in water based on the isotopic analysis of N2O produced from the conversion of NO3– by cultured denitrifying bacteria and off-axis integrated cavity output ...
发布时间: 2015 - 07 - 21
浏览次数:289
Nature 发表文章:In-situ unsaturated zone stable water isotope (2H and 18O) measurements in semi-arid environments using tunable o-axis integrated cavity output spectroscopy科学家应用LGR液态水同位素分析仪在半干旱环境下原位测量不饱和带水中2H和18O同位素比值M. Gaj1,2,  M. Beyer1,  P. Koeniger1,  H. Wanke3,  J. Hamutoko3,  and T. Himmelsbach11 Federal Institue for Geosciences and Natural Resources (BGR), Stilleweg 2, Hannover, Germany2 Chair of Hydrology, Faculty of Environment and Natural Resources, University of Freiburg, Fahnenbergplatz, 79098 Freiburg, Germany3Universit...
发布时间: 2015 - 07 - 07
浏览次数:317
Inter- and intraindividual correlations of background abundances of 2H, 18O and 17O in human urine and implications for DLW measurements科学家应用LGR同位素分析仪测定人体尿液中的2H,18O和17O丰度间的相互作用对DLW测量方法的影响E S F Berman, E L Melanson, T Swibas, S P Snaith and J R SpeakmanBackground/Objectives:The method of choice for measuring total energy expenditure in free-living individuals is the doubly labeled water (DLW) method. This experiment examined the behavior of natural background isotope abundance fluctuations within and between individuals over time to assess possible methods of accounting for varia...
发布时间: 2015 - 07 - 01
浏览次数:259
科学家应用Campbell CPEC200闭路涡动相关系统测量森林碳封存Canada: Forest Carbon SequestrationCampbell Scientific CPEC200 monitors eddy-covariance fluxes in British Columbia forest文章下载地址:79canada-vancouver-island--CPEC200.pdf4da92e4cbee3e5c7273825cef11d6136.pdf(2.84 MB)
发布时间: 2015 - 05 - 19
浏览次数:256
Field Spectroscopy in the VNIR-SWIR Region to Discriminate between Mediterranean Native Plants and Exotic-Invasive Shrubs Based on Leaf Tannin Content基于可见光近红外(VNIR)和短波红外(SWIR),科学家应用ASD地物光谱仪测量叶片单宁的含量,从而区分地中海附近海岸的本土植物和外来入侵灌木。Authors:Jan Rudolf Karl Lehmann, André Große-Stoltenberg, Meike Römer and Jens OldelandAbstract:The invasive shrub, Acacia longifolia, native to southeastern Australia, has a negative impact on vegetation and ecosystem functioning in Portuguese dune ecosystems. In order to spectrally discriminate A. longifoliafrom other non-native and native species,...
发布时间: 2015 - 05 - 12
浏览次数:333
科学家应用LGR氨气分析仪快速原位机载测量空气中氨气的含量Fast in situ Airborne Measurement of AmmoniaUsing a Mid-Infrared Off-Axis ICOS Spectrometer科学家应用LGR氨气分析仪快速原位机载测量空气中氨气的含量,这可以帮助我们更好的分析大气的成分和气溶胶的组成,具有深远的意义。J. Brian Leen,†,* Xiao-Ying Yu,‡,* Manish Gupta,† Douglas S. Baer,† John M. Hubbe,‡ Celine D.Kluzek, ‡ Jason M. Tomlinson,‡ and Mike R. Hubbell II‡†Los Gatos Research Inc., 67 E. Evelyn Ave, Suite 3, Mountain View, CA 94041‡Pacific Northwest National Laboratory, 902 Battelle Boulevard, Richland, WA 99352ABSTRACT:A new ammonia (NH3) analyzer was developed based on off-axis integrated cavity output spectroscopy...
发布时间: 2015 - 03 - 17
浏览次数:261
The relative role of soil type and tree cover on water storageand transmission in northern headwater catchments科学家应用LGR液态水同位素分析仪在北部水源集中区域监测土壤类型与植被覆盖类型对水的存储和传输的影响Josie Geris,1*Doerthe Tetzlaff,1Jeffrey McDonnell1,2and Chris Soulsby11Northern Rivers Institute, School of Geosciences, University of Aberdeen, Scotland, UK2Global Institute for Water Security, National Hydrology Research Centre, University of Saskatchewan, Saskatoon, CanadaAbstract:Soil water storage and stable isotopes dynamics were investigated in dominant soil–vegetation assemblages of a wet northern headwater catchment (3.2 ...
发布时间: 2015 - 02 - 26
浏览次数:229
科学家应用LGR液态水同位素分析仪做同位素示踪研究,研究证明,重碳酸盐的修正可以提高被铀污染的含水层的生物还原修复能力。Bicarbonate impact on U(VI) bioreductionin a shallow alluvial aquiferPhilip E. Longa, Kenneth H. Williamsa, James A. Davisa, Patricia M. Foxa, Michael J. Wilkinsb,1,Steven B. Yabusakib, Yilin Fangb, Scott R. Waichlerb, Elena S.F. Bermanc, Manish Guptac, Darrell P. Chandlerd, Chris Murrayb, Aaron D. Peacocke, Ludovic Giloteauxf, Kim M. Handleyg,2, Derek R. Lovleyh,Jillian F. BanfieldgaLawrence Berkeley National Laboratory, Berkeley, CA 94720, USAbPacific Northwe...
发布时间: 2015 - 02 - 04
浏览次数:272
Direct Analysis of δ2H and δ18O in Natural and Enriched Human Urine Using Laser-Based, Off-Axis Integrated Cavity Output Spectroscopy应用LGR液态水稳定同位素分析仪测量尿液中的氢氧同位素Elena S. F. Berman*†, Susan L. Fortson†, Steven P. Snaith†, Manish Gupta†, Douglas S. Baer†,Isabelle Chery‡, Stephane Blanc‡, Edward L. Melanson§, Peter J. Thomson⊥, and John R. Speakman⊥∥†Los Gatos Research, 67 East Evelyn Ave, Suite 3, Mountain View California 94043, United States‡Department of Ecology, Physiology and Ethology, IPHC-DEPE, Université de Strasbourg, 23 rue Becquerel...
发布时间: 2015 - 01 - 27
浏览次数:287
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