冬小麦冠层光谱的方向性特征分析(6)

2021-04-05 23:05

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

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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

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Chun-jiang,HUANGWen-jiang,WANGJi-hua,etal(赵春江。黄文江,王纪华,等).TransactionsoftheChineseSociety

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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)


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