针对基础科学中的相关领域进行详细探讨和研究,并对相关技术应用进行了说明。
第6期
SandmeierSandmeier
光谱学与光谱分析
S.MullerC,HosgoodB.etaL
RemoteSm&EnviroTL,1998,66:222.
1605
7
8
910
S,MullerC,HosgoodB,etaLRemoteSens,Envil'011.。1998。64:176.
W。etaLJournalofGeoph.Res.,1999,104:9547.
al(张雪红,赵峰,刘绍民,等).TransactionsoftheChineseSocietyofAgrieul—
SandmeierS,MiddletonEM,DeeringD
ZHANGXue-hong,ZHAOFeng,I.IUShao-min,ettural
Engineering(农业_T程学报),2006。22(6):7.
Jin-di。MUXi-han,etal(黄文江,王锦地,穆西晗,等).SpectroscopyandSpectralAnalysis(光谱学与光谱
Ⅱ妇口幻
HUANGWen-jiang,WANG
分析),2007,27(10):1921.
ZHAO
Chun-jiang,HUANGWen-jiang,WANGJi-hua,etal(赵春江。黄文江,王纪华,等).TransactionsoftheChineseSociety
of船
ricuhuralEngineering(农业-£程学报),2006.22(6):104.
MiddletonE札RemoteSens.Environ..1991,38:45.
口1=I叼妇口观
XIAOChun-hua,LIShao-kun,wANGKe-ru,et41(8):2271.
al(肖春华,李少昆,王克如,等).ScientiaAgriculturaSinica(中国农业科学),2008t
QINWerrhan,XIANGYue-qin(覃文汉,项月琴).RemoteSensingofEnvironmentChiha(环境遥感),1996.11(4):285.
AnalysisofDirectionalCharacteristicsof
WinterWheat
CanopySpectra
ZHANGXue-hon91~,TIANQing-jiul,SHENRun-pingz
1.InternationalInstituteforEarthSystemScience,NanjingUniversity,Nanjing
210093.China
210044,China
2.SchoolofRemoteSensing,NaniingUniversityofInformationScience&Technology,Nanjing
Abstract
Thebidirectionalreflectancefactors
is
vary
as
theincidencedirectionsandtheviewangleschangeAtpresenttheremoteimprovetheaccuracyof
on
sensing
the
almost
at
nadir,thereforeitispossible
to
remote
sensingapplicationbyreasonablyselecting
at
lookingangle。solar
zenithangle,andsoon.Basedthemultidirectionalspectraofwinterwheatcanopy
to
severalcritical
zen—
growthstages,thepaperquantitativelyanalyzedthesensitivityofnarrowhandbidirectionalreflectance
view
planes,view
ithangle,solarzenithangle,growthstage,andhandbyusinganisotropyfactor(ANlF)andanisotropyindex(ANⅨ).T1lechangeofNDVlwithviewzenithangle。solarzenithangleandmpycharacteristicsofbidirectionalreflectancefactors
at
growthstage
wasalsostudied.Theresultsshowthattheanisot—
at
solarprincipalplanewasstrongerthanthat
theotherplanes,and
or-
thogonalprincipalplanewastheweakesLTheANⅨatsolarprincipalplanewasthebiggest.T.11ereasonwasthattheshadowofcanopychanged
torat
n'g)re
dramatically
at
solarprincipalplanethan
near
at
theotherplanes.Thesensitivityofbidirectionalreflectancefac—
reason
visiblebands
to
zenithangleswasstrongerthanin
near
infraredregions,the
forwhichwasthattheshadoweffect
near
in
visibleregionswasstrongerthanin
infraredregions.TheANⅨinvisibleregionswasbiggerthanin
to
infrared
re-
gions.ThesensitivityofbidirectionalreflectancefactorND、rIsthan
at
at
solarzenithanglesincreased
as
theviewzenithangleincreased.The
lookingzenithangleallincreasedwiththeleafareaindexincreasingTheND、rIsatforwarddirectionwerelarger
backwarddirection.whichresultedfromthattheshadoweffectinvisibleregionswasstrongerthaninnearinfraredre-
every
structure
gions.Thesolarprineipalplaneimpliesrichinternalobservingmethod,thenearinfraredbandsandought
to
information
on
object.Inordertoreducetheuncertaintyfrom
the
small
solarzenithanglesheluldhechosen.Theretrieveofstructureparameters
selectsolarprincipalplane.andavoidhotspotregionwheninversingbiologicalparametersusing
ND、,I
Keywords
Sensitivity;Bidirectionalreflectance;Principalplane!Viewzenithangle;Solarzenithangle;NDVI
(ReceivedSep.12,2009;acceptedDec.16,2009)