太阳辐射强度与观测角度对冬小麦冠层反射高光谱的影响

掌握冠层反射光谱二向性反射特征,对提高遥感应用精度有重要意义。该文利用地面自动遥感平台对冬小麦冠层进行了连续观测,获取了大量的多角度高光谱遥感数据,分析了多种因素对冠层反射光谱的影响,并进行了NDVI与EVI的对比分析。结果表明：冠层反射光谱对天气有响应,随着太阳辐射增加冠层反射光谱增高,晴天变化更明显;观测角度的改变导致冠层反射光谱的差异,可用＂热点效应＂加＂镜面反射＂解释;与上述条件相适应,NDVI与EVI也表现出与冠层反射光谱相似变化;受红光和近红外波段的变化影响,NDVI与EVI之间的变化趋势较一致,两者相关系数R2〉0.72,且P〈0.01,呈极显著相关。该研究结果可为遥感观测角度的...

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Bibliographic Details
Published in农业工程学报 Vol. 32; no. 10; pp. 157 - 163
Main Author 郭建茂 王迁 童应详 费敦悦 刘俊伟
Format Journal Article
LanguageChinese
Published 南京信息工程大学气象灾害预报预警与评估协同创新中心/江苏省农业气象重点实验室/应用气象学院,南京,210044%安徽省寿县气象局,寿县,232200 2016
Subjects
EVI
NDVI
作物
光谱分析
冠层
反射
小麦
spectrum analysis
canopy
reflection
作物
冠层
光谱分析
EVI
wheat
crops
小麦
反射
NDVI
Online AccessGet full text
ISSN1002-6819
DOI10.11975/j.issn.1002-6819.2016.10.022

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Summary:掌握冠层反射光谱二向性反射特征,对提高遥感应用精度有重要意义。该文利用地面自动遥感平台对冬小麦冠层进行了连续观测,获取了大量的多角度高光谱遥感数据,分析了多种因素对冠层反射光谱的影响,并进行了NDVI与EVI的对比分析。结果表明：冠层反射光谱对天气有响应,随着太阳辐射增加冠层反射光谱增高,晴天变化更明显;观测角度的改变导致冠层反射光谱的差异,可用＂热点效应＂加＂镜面反射＂解释;与上述条件相适应,NDVI与EVI也表现出与冠层反射光谱相似变化;受红光和近红外波段的变化影响,NDVI与EVI之间的变化趋势较一致,两者相关系数R2〉0.72,且P〈0.01,呈极显著相关。该研究结果可为遥感观测角度的选择设计和植被指数的应用提供理论参考。
Bibliography:11-2047/S
In recent years, as spectral resolution is being accurate to nanometer level, hyperspectral remote sensing has a unique advantage in the detection of plant life information and the analysis of vegetation growth status. Grasping bidirectional reflectance characteristics of the canopy reflectance spectrum is significant to improve the accuracy of remote sensing applications. Many scholars at home and abroad measured and analyzed the vegetation reflectance rate with the change of view angle, variation of solar zenith angle and season, but they mainly focused on the meadows and forests, and the systematical sensitivity analysis on crop reflectance spectrum was less involved. This paper got a lot of multi-angle hyperspectral remote sensing data based on surface automatic remote sensing platforms. Different from the traditional field spectrometer（ASD Fieldspec）, Jaz-Combo 2 spectrometer（Ocean Optics, America） uses the field automatic observation system and has some advantages of low cost, continuous observ
ISSN:1002-6819
DOI:10.11975/j.issn.1002-6819.2016.10.022