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时间:2018-07-08
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1、中山大学学报(自然科学版)ACTASCIENTIARUMNATURALIUMUNIVERSITATISSUNYATSENI第51卷第1期2012年1月Vol.51No.1Jan.2012*广东飞来峡库区水深遥感陈启东1,邓孺孺1,秦雁1,何颖清1,汪伟2(1.中山大学地理科学与规划学院,广东广州510275;2.广东省东江流域管理局,广东惠州516000)摘要:通过深入分析太阳光在水体中传输的物理过程,引入水体光学厚度概念,根据辐射传输理论,推导出水深遥感物理模型。以广东省飞来峡水库为例,采用SP
2、OT5多光谱遥感数据,对其进行精确的辐射纠正、大气纠正,转化为符合地表实际反射率的反射率图像。经过水陆分离,选用合适的遥感波段数据,代入有关水体光学参数,应用水深遥感模型,计算出水域各像元水深值,通过图像处理软件绘制水深遥感制图。由于水面采砂、网箱养殖等人类活动的影响,水库采砂区水域水体浑浊以及库湾水域叶绿素浓度偏大,影响水深遥感精度,本文的模型综合考虑了水中泥沙和叶绿素对水深遥感的影响,并采用多波段数据求解水深,信息量丰富,精度得到大幅度提高。关键词:水深遥感;物理模型;飞来峡;SPOT5文章编
3、号:中图分类号:文献标志码:0529-6579(2012)01-0122-06TP79AWaterDepthExtractionfromRemoteSensingImageinFeilaixiaReservoirCHENQidong1,DENGRuru1,QINYan1,HEYingqing1,WANGWei2(1.SchoolofGeographyandPlanning,SunYat-senUniversity,Guangzhou510275,China;2.GuangdongProvincia
4、lAdministrationofDongjiangRiverBasin,Huizhou516000,China)Abstract:Basedonthephysicalmechanismoflighttransmissioninwater,theconceptofwateropticalthicknessisintroducedintothetransmissionstudy,andthenanintegratedmodelforquantitativelycalcu-latingwaterdep
5、thbyusingremotesensingtechniqueswaspresentedinthispaper.TakeFelaixiareservoirinGuangdongasacasestudyinthispaper.Firstly,SPOT5remotesensingdatathroughradiationcorrec-tionandatmosphericcorrectionwereconvertedintoreflectanceimageinaccordancewithactualsur
6、facereflectance.Secondly,theinformationofwaterswasextractedbycomparingthespectraofwatersandlands,andthenopticalparametersofwatersweresubstitutedintotheintegratedmodels,selectingtheap-propriatebandsofremotesensing,forcalculatingthewaterdepths.Finally,t
7、hecalculatedwaterdepthswereinputdrawingsoftwaretogeneratetheremotesensingmapofwaterdepths.Theinfluenceofsandminingandcageculture,suchasturningmuddyandhighchlorophyllconcentrationofthereservoirwa-ters,ontheprecisionofwaterdepthinformationhasbeenconside
8、redinthemodelbuildinginthispaper,andhencemulti-spectralremotesensingdataweresuccessfullyappliedtoimprovethecalculationaccuracy.Keywords:waterdepth;physicalmodel;feilaixiareservoir;SPOT5传统的水下测深工作十分复杂,耗时且费力,部分地区环境条件恶劣等影响使测量工作更为不*收稿日期:基金项目:2011-0
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