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1、第30卷第10期環(huán)境科學(xué)Vol.30,No.102009年10月Oct.,2009ENVIRONMENTALSCIENCE利用Hyperion高光譜數(shù)據(jù)的三波段法反演太湖葉綠素a濃度1,2111杜聰,王世新,周藝,閻福禮(11中國科學(xué)院遙感應(yīng)用研究所,北京100101;21中國科學(xué)院研究生院,北京100049)-1-1摘要:以2004208219太湖野外試驗所獲取的水質(zhì)數(shù)據(jù)(葉綠素a濃度718～15413μg·L,總懸浮物濃度6510～19012mg·L,N=38)和同步的Hyperion星載高光譜數(shù)據(jù)為研究對象,利
2、用三波段算法反演太湖水體的葉綠素a濃度.通過分析太湖固有光學(xué)量的特點,提出適用于太湖的3個特征波段的選擇依據(jù),并對波段進(jìn)行優(yōu)化計算,在此基礎(chǔ)上建立了三波段統(tǒng)計模型,最后對模型的反演精度進(jìn)行分析與評價.結(jié)果表明,Hyperion的B34(691137nm)、B37(721190nm)和B50(854118nm)組成三波段模型變2-1量與葉綠素a濃度具有最高的相關(guān)系數(shù)(r=01934),模型的決定系數(shù)(R)和均方根誤差(RMSE)分別為01872和13193μg·L,2-12其反演精度優(yōu)于傳統(tǒng)經(jīng)驗統(tǒng)計模型,如比值模型(R
3、=01844,RMSE=15141μg·L)和一階微分模型(R=01831,RMSE=16100-1μg·L).研究結(jié)果證實了三波段法適用于內(nèi)陸富營養(yǎng)化渾濁水體和Hyperion高光譜數(shù)據(jù),為今后更精確地反演內(nèi)陸水體的葉綠素a濃度提供了參考依據(jù).關(guān)鍵詞:葉綠素a;三波段模型;Hyperion;高光譜;太湖中圖分類號:X87文獻(xiàn)標(biāo)識碼:A文章編號:025023301(2009)1022904207RemoteChlorophyllaRetrievalinTaihuLakebyThree2bandModelUsingHy
4、perionHyperspectralData1,2111DUCong,WANGShi2xin,ZHOUYi,YANFu2li(11InstituteofRemoteSensingApplications,ChineseAcademyofSciences,Beijing100101,China;21GraduateUniversityofChineseAcademyofSciences,Beijing100049,China)Abstract:Toretrievechlorophylla(Chla)concentra
5、tioninTaihuLakebythree2bandmodel,afieldstudywasconductedonAugust19,2004-1tocollectwatersamples(N=38),whichcontainedwidelyvariableChla(718215413μg·L)andtotalsuspendedsolids(6510219012mg·-1Ldrywt),andthesynchronousHyperionimageswasalsoacquiredasremotesensingdata.
6、AfterobtainingtheapproximaterangeofwavelengthsforthethreebandsbyanalyzingtheinherentopticalpropertiesofTaihuLake,thethree2bandmodelswerespectrallytunedtoselectthebandsformostaccurateChlaestimation.FinallyHyperionB34(691137nm),B37(721190nm)andB50(854118nm)werese
7、lectedtoestablishathree2bandmodel.TheresultsshowthatstronglinearrelationshipisfoundbetweenanalyticallymeasuredChlaandthethree2bandmodel(r=01934),whichaccountsfor8712%ofvariationinChlaandallowsestimationofChlawitharootmeansquareerror(RMSE)of-1213193μg·L,whereast
8、hetraditionaltwo2bandmodelsaccountsforloweraccuraciesofChlaestimation(spectralratio,R=01844,RMSE-12-1=15141μg·L,andreflectancefirst2derivative,R=01831,RMSE=16100μg·L).Thefin
