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The combination of ground remote sensing and UAV remote sensing was used to estimate the nitrogen content of typical grassland vegetation in Inner Mongolia. This experiment was carried out in the grassland ecology research base of Inner Mongolia University from August to September 2023, and the ground ASD spectral data and UAV Resonon data were collected. Based on ASD data, four spectral parameters of vegetation index, hyperspectral characteristic variable, continuum removal variable and wavelet coefficient were constructed, and LASSO was used to screen sensitive parameters. Five models of multiple linear, XGBoost, SVM, ANN and KNN were constructed to estimate the nitrogen content of vegetation. The results showed that the SVM method based on wavelet coefficients was the optimal model(validation set R2=0.72, RMSE and MAE were 0.26 and 0.18, respectively). Finally, the model was used to estimate and map the UAV Resonon data(validation set R2=0.41, RMSE and MAE were 0.42 and 0.32, respectively). The research showed that the combination of ASD and UAV images with machine learning algorithms could be used to realize the estimation of grassland vegetation nitrogen content, and was provided basic data and technical support for optimizing fertilization and improving forage quality.
, correspAuthors=Xiu-mei WANG, Jian-jun DONG, authorNote=null, correspAuthorsNote=null, copyrightStatement=null, copyrightOwner=null, extLink=null, articleAbsUrl=null, sourceXml=null, magXml=null, pdfUrl=null, pdf=null, pdfFileSize=null, pdfExtLink=null, richHtmlUrl=null, mobilePdfUrl=null, reviewReport=null, pdfFirstPage=null, abstractGraph=null, abstractGraphContent=null, abstractVideo=null, citation=null, cebUrl=null, magXmlContent=null, mapNumber=null, authorCompany=null, fund=null, authors=null, authorsList=Li-shan JIN, Xiu-mei WANG, Jian-jun DONG, Ruo-chen WANG, He-fei WEN, Yu-yan SUN, Wen-bo WU, Zhi-hang ZHANG, Can KANG), CN=ArticleExt(id=1241057228254400937, articleId=1241057220608185108, tenantId=1146029695717560320, journalId=1234093305789726721, language=CN, title=结合ASD和无人机高光谱的内蒙古典型草原植被氮反演, columnId=1234106388268503686, journalTitle=中国环境科学, columnName=环境生态, runingTitle=null, highlight=null, articleAbstract=
采用地面遥感与无人机遥感相结合的方式对内蒙古典型草原植被氮含量进行估测.实验于2023年8~9月在内蒙古大学草地生态学研究基地进行,采集了地面ASD光谱数据和无人机Resonon数据.基于ASD数据构建了植被指数、“三边参数”、连续统去除参数以及小波系数4种光谱参数,并运用LASSO进行敏感参数筛选.分别构建多元线性、XGBoost、SVM、ANN和KNN共5种模型对植被氮含量进估测,结果表明基于小波系数的SVM方法为最优模型(验证集R2=0.72,RMSE和MAE分别为0.26和0.18).最后将此模型用于无人机Resonon数据进行反演估算并制图(验证集R2=0.41,RMSE和MAE分别为0.42和0.32).研究显示,将ASD和无人机影像与机器学习算法相结合,能够实现草原植被氮含量的估算,为牧场优化施肥、提高牧草品质提供基础数据与技术支撑.
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金利山(2001-),男,甘肃武威人,硕士研究生,主要从事高光谱遥感研究.发表论文2篇.20231800232@imut.edu.cn.
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金利山(2001-),男,甘肃武威人,硕士研究生,主要从事高光谱遥感研究.发表论文2篇.20231800232@imut.edu.cn.
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72(1):27-35., articleTitle=Remote sensing of forage nutrients: Combining ecological and spectral absorption feature data, refAbstract=null)], funds=[Fund(id=1241057244335362502, tenantId=1146029695717560320, journalId=1234093305789726721, articleId=1241057220608185108, awardId=2022LHMS03006, language=CN, fundingSource=内蒙古自治区自然科学基金(2022LHMS03006), fundOrder=null, country=null), Fund(id=1241057244452803023, tenantId=1146029695717560320, journalId=1234093305789726721, articleId=1241057220608185108, awardId=DC2300001284, language=CN, fundingSource=内蒙古工业大学博士研究生启动基金(DC2300001284), fundOrder=null, country=null), Fund(id=1241057244595409370, tenantId=1146029695717560320, journalId=1234093305789726721, articleId=1241057220608185108, awardId=JY20220108, language=CN, fundingSource=内蒙古自治区直属高校基本科研业务费项目(JY20220108), fundOrder=null, country=null), Fund(id=1241057244687684065, tenantId=1146029695717560320, journalId=1234093305789726721, articleId=1241057220608185108, awardId=RH2400001221, language=CN, fundingSource=巴林-奈曼(金沙)阜新500KV输变电工程(内蒙段)生态监测辅助工作(RH2400001221), fundOrder=null, country=null)], companyList=[AuthorCompany(id=1241057228522836427, tenantId=1146029695717560320, journalId=1234093305789726721, articleId=1241057220608185108, xref=1., ext=[AuthorCompanyExt(id=1241057228531225036, tenantId=1146029695717560320, journalId=1234093305789726721, articleId=1241057220608185108, companyId=1241057228522836427, language=EN, country=null, province=null, city=null, postcode=null, companyName=null, departmentName=null, remark=
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Spectral curve of vegetation canopy, figureFileSmall=8A0J2F/K5LVF3zTAXkjLrg==, figureFileBig=jd/O4xWOnbRNeISUtlZ2zA==, tableContent=null), ArticleFig(id=1241057236496208891, tenantId=1146029695717560320, journalId=1234093305789726721, articleId=1241057220608185108, language=CN, label=图1, caption=
植被冠层的光谱曲线, figureFileSmall=8A0J2F/K5LVF3zTAXkjLrg==, figureFileBig=jd/O4xWOnbRNeISUtlZ2zA==, tableContent=null), ArticleFig(id=1241057236802392090, tenantId=1146029695717560320, journalId=1234093305789726721, articleId=1241057220608185108, language=EN, label=Fig.2, caption=
Comparison of ASD and Resonon spectral curves, figureFileSmall=YdCuk+F2HiSDoJbWl/6uDA==, figureFileBig=oQZKwrzbnvvUoq4CHZ3P0A==, tableContent=null), ArticleFig(id=1241057236957581352, tenantId=1146029695717560320, journalId=1234093305789726721, articleId=1241057220608185108, language=CN, label=图2, caption=
ASD和Resonon光谱曲线对比, figureFileSmall=YdCuk+F2HiSDoJbWl/6uDA==, figureFileBig=oQZKwrzbnvvUoq4CHZ3P0A==, tableContent=null), ArticleFig(id=1241057237049856054, tenantId=1146029695717560320, journalId=1234093305789726721, articleId=1241057220608185108, language=EN, label=Fig.3, caption=
Correlation analysis between vegetation index and nitrogen content, figureFileSmall=Cm1FrpqJOrcOHK88s4wImw==, figureFileBig=M+ZTgQeJ76GmqFNlUUunHA==, tableContent=null), ArticleFig(id=1241057237175685187, tenantId=1146029695717560320, journalId=1234093305789726721, articleId=1241057220608185108, language=CN, label=图3, caption=
植被指数与氮含量的相关性分析, figureFileSmall=Cm1FrpqJOrcOHK88s4wImw==, figureFileBig=M+ZTgQeJ76GmqFNlUUunHA==, tableContent=null), ArticleFig(id=1241057237284737102, tenantId=1146029695717560320, journalId=1234093305789726721, articleId=1241057220608185108, language=EN, label=Fig.4, caption=
Correlation analysis between ' trilateral parameter ' and nitrogen content, figureFileSmall=u5ugEIbN9GLj1p3z4z7CxA==, figureFileBig=4oFOlmlSakPf4NJjuHVtSg==, tableContent=null), ArticleFig(id=1241057237418954835, tenantId=1146029695717560320, journalId=1234093305789726721, articleId=1241057220608185108, language=CN, label=图4, caption=
“三边参数”与氮含量的相关性分析, figureFileSmall=u5ugEIbN9GLj1p3z4z7CxA==, figureFileBig=4oFOlmlSakPf4NJjuHVtSg==, tableContent=null), ArticleFig(id=1241057237666418789, tenantId=1146029695717560320, journalId=1234093305789726721, articleId=1241057220608185108, language=EN, label=Fig.5, caption=
Correlation analysis between removal parameters of continuum and nitrogen content, figureFileSmall=/dyMgjkCCgbNNKB+yRAgxQ==, figureFileBig=d8w/PeE0s9rySGW45htuFw==, tableContent=null), ArticleFig(id=1241057239230894196, tenantId=1146029695717560320, journalId=1234093305789726721, articleId=1241057220608185108, language=CN, label=图5, caption=
连续统去除参数与氮含量的相关性分析, figureFileSmall=/dyMgjkCCgbNNKB+yRAgxQ==, figureFileBig=d8w/PeE0s9rySGW45htuFw==, tableContent=null), ArticleFig(id=1241057239352529021, tenantId=1146029695717560320, journalId=1234093305789726721, articleId=1241057220608185108, language=EN, label=Fig.6, caption=
Heatmap of correlation coefficient between wavelet coefficient and nitrogen content, figureFileSmall=B13PJ8QSIEGXglKpIlm1eg==, figureFileBig=q56g+1rH8X7zsQHUFAAoBg==, tableContent=null), ArticleFig(id=1241057239482552459, tenantId=1146029695717560320, journalId=1234093305789726721, articleId=1241057220608185108, language=CN, label=图6, caption=
小波系数与氮含量相关系数热图, figureFileSmall=B13PJ8QSIEGXglKpIlm1eg==, figureFileBig=q56g+1rH8X7zsQHUFAAoBg==, tableContent=null), ArticleFig(id=1241057239579021460, tenantId=1146029695717560320, journalId=1234093305789726721, articleId=1241057220608185108, language=EN, label=Fig.7, caption=
Vegetation index inversion results, figureFileSmall=0f3/9D1LJOOYBECNkfyA/w==, figureFileBig=yeVhLJ4qsEVtAsfLPRCf0g==, tableContent=null), ArticleFig(id=1241057239671296158, tenantId=1146029695717560320, journalId=1234093305789726721, articleId=1241057220608185108, language=CN, label=图7, caption=
植被指数反演结果, figureFileSmall=0f3/9D1LJOOYBECNkfyA/w==, figureFileBig=yeVhLJ4qsEVtAsfLPRCf0g==, tableContent=null), ArticleFig(id=1241057239784542373, tenantId=1146029695717560320, journalId=1234093305789726721, articleId=1241057220608185108, language=EN, label=Fig.8, caption=
“trilateral parameter”inversion result, figureFileSmall=rRL27uO5Sn+oq7je/4reNw==, figureFileBig=0x6MhS+1yJyf24kTmR18mg==, tableContent=null), ArticleFig(id=1241057239906177200, tenantId=1146029695717560320, journalId=1234093305789726721, articleId=1241057220608185108, language=CN, label=图8, caption=
“三边参数”反演结果, figureFileSmall=rRL27uO5Sn+oq7je/4reNw==, figureFileBig=0x6MhS+1yJyf24kTmR18mg==, tableContent=null), ArticleFig(id=1241057240040394941, tenantId=1146029695717560320, journalId=1234093305789726721, articleId=1241057220608185108, language=EN, label=Fig.9, caption=
Continuum removal parameter inversion results, figureFileSmall=VZbiPChAKmYvMhkkaP5yYA==, figureFileBig=D7Ag0W/jWzdiz6qwODy5eQ==, tableContent=null), ArticleFig(id=1241057240220750033, tenantId=1146029695717560320, journalId=1234093305789726721, articleId=1241057220608185108, language=CN, label=图9, caption=
连续统去除参数反演结果, figureFileSmall=VZbiPChAKmYvMhkkaP5yYA==, figureFileBig=D7Ag0W/jWzdiz6qwODy5eQ==, tableContent=null), ArticleFig(id=1241057240346579161, tenantId=1146029695717560320, journalId=1234093305789726721, articleId=1241057220608185108, language=EN, label=Fig.10, caption=
Wavelet coefficient inversion results, figureFileSmall=jFJZRkKYmCmr2W3M8I+OcQ==, figureFileBig=fIHXvk34lD0zd84VMa4Xvg==, tableContent=null), ArticleFig(id=1241057240535322862, tenantId=1146029695717560320, journalId=1234093305789726721, articleId=1241057220608185108, language=CN, label=图10, caption=
小波系数反演结果, figureFileSmall=jFJZRkKYmCmr2W3M8I+OcQ==, figureFileBig=fIHXvk34lD0zd84VMa4Xvg==, tableContent=null), ArticleFig(id=1241057240661151995, tenantId=1146029695717560320, journalId=1234093305789726721, articleId=1241057220608185108, language=EN, label=Fig.11, caption=
Wavelet coefficient-SVM inversion results based on Resonon data, figureFileSmall=sNgDwl+2UmUoX6pC25LTdw==, figureFileBig=Nq6yuuqZi0ryfqMZcbiTKw==, tableContent=null), ArticleFig(id=1241057240862478609, tenantId=1146029695717560320, journalId=1234093305789726721, articleId=1241057220608185108, language=CN, label=图11, caption=
基于Resonon数据的小波系数-SVM反演结果, figureFileSmall=sNgDwl+2UmUoX6pC25LTdw==, figureFileBig=Nq6yuuqZi0ryfqMZcbiTKw==, tableContent=null), ArticleFig(id=1241057240988307740, tenantId=1146029695717560320, journalId=1234093305789726721, articleId=1241057220608185108, language=EN, label=Fig.12, caption=
Spatial distribution of vegetation nitrogen content in the study area, figureFileSmall=ugWo7/0s+ER3c+HU8O10Xg==, figureFileBig=yqE4hxpBAMFRp92tZX258Q==, tableContent=null), ArticleFig(id=1241057241122525478, tenantId=1146029695717560320, journalId=1234093305789726721, articleId=1241057220608185108, language=CN, label=图12, caption=
研究区植被氮含量空间分布, figureFileSmall=ugWo7/0s+ER3c+HU8O10Xg==, figureFileBig=yqE4hxpBAMFRp92tZX258Q==, tableContent=null), ArticleFig(id=1241057241218994482, tenantId=1146029695717560320, journalId=1234093305789726721, articleId=1241057220608185108, language=EN, label=Table 1, caption=
ASD and UAV Resonon parameters
, figureFileSmall=null, figureFileBig=null, tableContent=
| 光谱设备 | 地面-ASD | UAV-Resonon |
|---|
| 型号 | Field Spec 4 | Pika L |
| 光谱范围(nm) | 350~2500 | 400~1000 |
| 光谱分辨率(nm) | 3(350~1000) | 2.1 |
| 10(1001~2500) |
| 光谱通道数(个) | 2151 | 561 |
), ArticleFig(id=1241057241323852088, tenantId=1146029695717560320, journalId=1234093305789726721, articleId=1241057220608185108, language=CN, label=表1, caption=
ASD和无人机Resonon参数
, figureFileSmall=null, figureFileBig=null, tableContent=
| 光谱设备 | 地面-ASD | UAV-Resonon |
|---|
| 型号 | Field Spec 4 | Pika L |
| 光谱范围(nm) | 350~2500 | 400~1000 |
| 光谱分辨率(nm) | 3(350~1000) | 2.1 |
| 10(1001~2500) |
| 光谱通道数(个) | 2151 | 561 |
), ArticleFig(id=1241057241483235655, tenantId=1146029695717560320, journalId=1234093305789726721, articleId=1241057220608185108, language=EN, label=Table 2, caption=
Vegetation index and calculation formula
, figureFileSmall=null, figureFileBig=null, tableContent=
| 名称 | 计算公式 | 文献 |
|---|
| 两波段植被指数 | 归一化差异植被指数(NDVI) | (R800−R670)/(R800+R670) | [18] |
| 土壤调节植被指数(SAVI) | 1.5×(R800−R670)/(R800+R670+0.5) | [19] |
| 归一化差异红边指数(NDRE) | (R790−R720)/(R790+R720) | [20] |
| 修改土壤调节植被指数(OSAVI) | 1.16×(R800−R670)/(R800+R670+0.16) | [21] |
| 绿色归一化植被指数(GNDVI) | (R750−R550)/(R750+R550) | [22] |
| 叶绿素红边指数(Clre) | (R750)/(R720)−1 | [23] |
| 叶绿素绿色指数(Clgreen) | (R800)/(R560)−1 | [23] |
| 植物生化指数(PBI) | (R810)/R560) | [24] |
| 植物色素比率(PPR) | (R550−R450)/(R550+R450) | [24] |
| 两波段增强植被指数(EVI2) | 2.5×(R800−R670)/(R800+2.4×R670+1) | [25] |
| 绿度指数(GI) | (R554)/(R667) | [26] |
| 红边归一化植被指数(NDVI705) | (R750−R705)/(R750+R705) | [27] |
| 氮素反射指数(NRI) | (R560−R670)/(R560+R670) | [28] |
| 花青素反射指数(ARI) | (1/R559)/(1/R721) | [29] |
| 三波段植被指数 | 修正归一化差异指数(mND705) | (R750−R705)/(R750+R705−2R445) | [30] |
| 修正比值植被指数(mSR705) | (R750−R445)/(R705−R445) | [30] |
| Meris陆地叶绿素指数(MTCI) | (R750−R710)/(R710−R680) | [31] |
| 转化叶绿素吸收指数(TCARI) | 3×[(R700−R670)−0.2×(R700−R550)(R700/R670)] | [32] |
| 三角植被指数(TVI) | 0.5×[120×(R800−R550)−200×(R670−R550)] | [33] |
| 光谱多边形植被指数(SPVI) | 0.4×[3.7×(R800−R670)−1.2×(R530−R670)] | [34] |
| 增强植被指数(EVI) | 2.5×[(R864−R660)/(R864+6×R660−7.5×R487+1)] | [35] |
), ArticleFig(id=1241057241588093265, tenantId=1146029695717560320, journalId=1234093305789726721, articleId=1241057220608185108, language=CN, label=表2, caption=
植被指数及计算公式
, figureFileSmall=null, figureFileBig=null, tableContent=
| 名称 | 计算公式 | 文献 |
|---|
| 两波段植被指数 | 归一化差异植被指数(NDVI) | (R800−R670)/(R800+R670) | [18] |
| 土壤调节植被指数(SAVI) | 1.5×(R800−R670)/(R800+R670+0.5) | [19] |
| 归一化差异红边指数(NDRE) | (R790−R720)/(R790+R720) | [20] |
| 修改土壤调节植被指数(OSAVI) | 1.16×(R800−R670)/(R800+R670+0.16) | [21] |
| 绿色归一化植被指数(GNDVI) | (R750−R550)/(R750+R550) | [22] |
| 叶绿素红边指数(Clre) | (R750)/(R720)−1 | [23] |
| 叶绿素绿色指数(Clgreen) | (R800)/(R560)−1 | [23] |
| 植物生化指数(PBI) | (R810)/R560) | [24] |
| 植物色素比率(PPR) | (R550−R450)/(R550+R450) | [24] |
| 两波段增强植被指数(EVI2) | 2.5×(R800−R670)/(R800+2.4×R670+1) | [25] |
| 绿度指数(GI) | (R554)/(R667) | [26] |
| 红边归一化植被指数(NDVI705) | (R750−R705)/(R750+R705) | [27] |
| 氮素反射指数(NRI) | (R560−R670)/(R560+R670) | [28] |
| 花青素反射指数(ARI) | (1/R559)/(1/R721) | [29] |
| 三波段植被指数 | 修正归一化差异指数(mND705) | (R750−R705)/(R750+R705−2R445) | [30] |
| 修正比值植被指数(mSR705) | (R750−R445)/(R705−R445) | [30] |
| Meris陆地叶绿素指数(MTCI) | (R750−R710)/(R710−R680) | [31] |
| 转化叶绿素吸收指数(TCARI) | 3×[(R700−R670)−0.2×(R700−R550)(R700/R670)] | [32] |
| 三角植被指数(TVI) | 0.5×[120×(R800−R550)−200×(R670−R550)] | [33] |
| 光谱多边形植被指数(SPVI) | 0.4×[3.7×(R800−R670)−1.2×(R530−R670)] | [34] |
| 增强植被指数(EVI) | 2.5×[(R864−R660)/(R864+6×R660−7.5×R487+1)] | [35] |
), ArticleFig(id=1241057241705533786, tenantId=1146029695717560320, journalId=1234093305789726721, articleId=1241057220608185108, language=EN, label=Table 3, caption=
'Trilateral parameters' and extraction method
, figureFileSmall=null, figureFileBig=null, tableContent=
| 类型 | 名称 | 定义 | 文献 |
|---|
| 光谱面积和位置参数 | Db | 蓝边490~530nm内一阶导数光谱的最大值 | [36] |
| λb | Db对应的波长位置 | [36] |
| Dy | 黄边560~640nm内一阶导数光谱的最大值 | [36] |
| λy | Dy对应的波长位置 | [36] |
| Dr | 红边680~760nm内一阶导数光谱的最大值 | [36] |
| λr | Dr对应的波长位置 | [36] |
| Rg | 绿峰反射率,波长520~560nm范围内的最大反射率 | [36] |
| λg | Rg对应的波长位置 | [37] |
| Rr | 红谷反射率,波长650~690nm范围内的最大反射率 | [37] |
| λa | Rr对应的波长位置 | [37] |
| SDb | 蓝边波长490~530nm范围内一阶导数光谱的积分 | [37] |
| SDy | 黄边波长560~640nm范围内一阶导数光谱的积分 | [37] |
| SDr | 红边波长680~760nm范围内一阶导数光谱的积分 | [37] |
| 光谱面积与位置的比值参数 | VI1 | 绿峰反射率Rg与红谷反射率Rr的比值 | [38] |
| VI2 | 绿峰反射率Rg与红谷反射率Rr的归一化值 | [38] |
| VI3 | 红边面积SDr和蓝边面积SDb的比值 | [38] |
| VI4 | 红边面积SDr和黄边面积SDy的比值 | [38] |
| VI5 | 红边面积SDr和蓝边面积SDb的归一化值 | [38] |
| VI6 | 红边面积SDr和黄边面积SDy的归一化值 | [38] |
), ArticleFig(id=1241057241810391396, tenantId=1146029695717560320, journalId=1234093305789726721, articleId=1241057220608185108, language=CN, label=表3, caption=
“三边参数”及提取方法
, figureFileSmall=null, figureFileBig=null, tableContent=
| 类型 | 名称 | 定义 | 文献 |
|---|
| 光谱面积和位置参数 | Db | 蓝边490~530nm内一阶导数光谱的最大值 | [36] |
| λb | Db对应的波长位置 | [36] |
| Dy | 黄边560~640nm内一阶导数光谱的最大值 | [36] |
| λy | Dy对应的波长位置 | [36] |
| Dr | 红边680~760nm内一阶导数光谱的最大值 | [36] |
| λr | Dr对应的波长位置 | [36] |
| Rg | 绿峰反射率,波长520~560nm范围内的最大反射率 | [36] |
| λg | Rg对应的波长位置 | [37] |
| Rr | 红谷反射率,波长650~690nm范围内的最大反射率 | [37] |
| λa | Rr对应的波长位置 | [37] |
| SDb | 蓝边波长490~530nm范围内一阶导数光谱的积分 | [37] |
| SDy | 黄边波长560~640nm范围内一阶导数光谱的积分 | [37] |
| SDr | 红边波长680~760nm范围内一阶导数光谱的积分 | [37] |
| 光谱面积与位置的比值参数 | VI1 | 绿峰反射率Rg与红谷反射率Rr的比值 | [38] |
| VI2 | 绿峰反射率Rg与红谷反射率Rr的归一化值 | [38] |
| VI3 | 红边面积SDr和蓝边面积SDb的比值 | [38] |
| VI4 | 红边面积SDr和黄边面积SDy的比值 | [38] |
| VI5 | 红边面积SDr和蓝边面积SDb的归一化值 | [38] |
| VI6 | 红边面积SDr和黄边面积SDy的归一化值 | [38] |
), ArticleFig(id=1241057241940414830, tenantId=1146029695717560320, journalId=1234093305789726721, articleId=1241057220608185108, language=EN, label=Table 4, caption=
Continuum removal parameters and definitions
, figureFileSmall=null, figureFileBig=null, tableContent=
| 名称 | 定义 |
|---|
| 最大吸收深度H | 吸收峰中的最大吸收值 |
| 吸收波段波长P | 吸收峰中最大吸收深度H对应的波长 |
| 吸收峰总面积A | 收峰中起始和终止波长内的波段深度的积分 |
| 吸收峰左面积LA | 吸收峰中左边吸收峰积分面积 |
| 吸收峰右面积RA | 吸收峰中右边吸收峰积分面积 |
| 对称度S | 吸收峰中左面积LA和右面积RA的比值 |
| 面积归一化最大吸收深度NMAD | 吸收峰最大吸收深度H与吸收峰总面积A的比值 |
), ArticleFig(id=1241057242036883831, tenantId=1146029695717560320, journalId=1234093305789726721, articleId=1241057220608185108, language=CN, label=表4, caption=
连续统去除参数及定义
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| 名称 | 定义 |
|---|
| 最大吸收深度H | 吸收峰中的最大吸收值 |
| 吸收波段波长P | 吸收峰中最大吸收深度H对应的波长 |
| 吸收峰总面积A | 收峰中起始和终止波长内的波段深度的积分 |
| 吸收峰左面积LA | 吸收峰中左边吸收峰积分面积 |
| 吸收峰右面积RA | 吸收峰中右边吸收峰积分面积 |
| 对称度S | 吸收峰中左面积LA和右面积RA的比值 |
| 面积归一化最大吸收深度NMAD | 吸收峰最大吸收深度H与吸收峰总面积A的比值 |
), ArticleFig(id=1241057242158518657, tenantId=1146029695717560320, journalId=1234093305789726721, articleId=1241057220608185108, language=EN, label=Table 5, caption=
Statistical description of vegetation nitrogen content(%)
, figureFileSmall=null, figureFileBig=null, tableContent=
| 数据 | Max | Min | Mean | SD | CV |
|---|
| 总体(229) | 3.55 | 1.45 | 2.49 | 0.47 | 19.0 |
| 训练集(189) | 3.55 | 1.45 | 2.48 | 0.47 | 18.9 |
| 验证集(40) | 3.42 | 1.45 | 2.49 | 0.48 | 19.3 |
), ArticleFig(id=1241057243685245323, tenantId=1146029695717560320, journalId=1234093305789726721, articleId=1241057220608185108, language=CN, label=表5, caption=
植被氮含量统计描述(%)
, figureFileSmall=null, figureFileBig=null, tableContent=
| 数据 | Max | Min | Mean | SD | CV |
|---|
| 总体(229) | 3.55 | 1.45 | 2.49 | 0.47 | 19.0 |
| 训练集(189) | 3.55 | 1.45 | 2.48 | 0.47 | 18.9 |
| 验证集(40) | 3.42 | 1.45 | 2.49 | 0.48 | 19.3 |
), ArticleFig(id=1241057243827851672, tenantId=1146029695717560320, journalId=1234093305789726721, articleId=1241057220608185108, language=EN, label=Table 6, caption=
LASSO feature screening results
, figureFileSmall=null, figureFileBig=null, tableContent=
| 变量类型 | 变量个数 | 变量 |
|---|
| 植被指数 | 2 | EVI2、ARI、SPVI |
| “三边参数” | 3 | Db、Dr、VI6 |
| 连续统去除参数 | 3 | H、S、NMAD |
| 小波系数 | 26 | 尺度1:WF536、WF608、WF620、WF621、WF690、WF691、WF693、WF699、WF703、WF738、WF739、WF995;尺度2:WF520、WF660、WF696、WF707;尺度3:WF657、WF717;尺度4:WF627、WF788、WF957;尺度5:WF401、WF573、WF876、WF927、WF962 |
), ArticleFig(id=1241057243957875101, tenantId=1146029695717560320, journalId=1234093305789726721, articleId=1241057220608185108, language=CN, label=表6, caption=
LASSO特征筛选结果
, figureFileSmall=null, figureFileBig=null, tableContent=
| 变量类型 | 变量个数 | 变量 |
|---|
| 植被指数 | 2 | EVI2、ARI、SPVI |
| “三边参数” | 3 | Db、Dr、VI6 |
| 连续统去除参数 | 3 | H、S、NMAD |
| 小波系数 | 26 | 尺度1:WF536、WF608、WF620、WF621、WF690、WF691、WF693、WF699、WF703、WF738、WF739、WF995;尺度2:WF520、WF660、WF696、WF707;尺度3:WF657、WF717;尺度4:WF627、WF788、WF957;尺度5:WF401、WF573、WF876、WF927、WF962 |
), ArticleFig(id=1241057244083704235, tenantId=1146029695717560320, journalId=1234093305789726721, articleId=1241057220608185108, language=EN, label=Table 7, caption=
Accuracy test of vegetation nitrogen content prediction model
, figureFileSmall=null, figureFileBig=null, tableContent=
| 输入变量 | 模型 | T-R2 | T-RMSE | T-MAE | V-R2 | V-RMSE | V-MAE |
|---|
| LASSO-植被指数 | 多元线性回归 | 0.38 | 0.37 | 0.29 | 0.43 | 0.38 | 0.29 |
| XGBoost | 0.71 | 0.26 | 0.19 | 0.60 | 0.30 | 0.21 |
| SVM | 0.72 | 0.26 | 0.17 | 0.68 | 0.28 | 0.19 |
| ANN | 0.72 | 0.24 | 0.18 | 0.68 | 0.27 | 0.19 |
| KNN | 0.72 | 0.24 | 0.17 | 0.65 | 0.28 | 0.19 |
| LASSO-“三边参数” | 多元线性回归 | 0.36 | 0.38 | 0.30 | 0.26 | 0.41 | 0.34 |
| XGBoost | 0.57 | 0.32 | 0.25 | 0.50 | 0.36 | 0.29 |
| SVM | 0.61 | 0.29 | 0.18 | 0.63 | 0.27 | 0.19 |
| ANN | 0.63 | 0.29 | 0.20 | 0.64 | 0.29 | 0.22 |
| KNN | 0.64 | 0.28 | 0.21 | 0.55 | 0.32 | 0.22 |
| LASSO-统去除参数 | 多元线性回归 | 0.26 | 0.41 | 0.33 | 0.28 | 0.42 | 0.32 |
| XGBoost | 0.42 | 0.37 | 0.30 | 0.20 | 0.44 | 0.32 |
| SVM | 0.42 | 0.37 | 0.27 | 0.20 | 0.43 | 0.32 |
| ANN | 0.44 | 0.35 | 0.26 | 0.22 | 0.42 | 0.30 |
| KNN | 0.55 | 0.32 | 0.24 | 0.18 | 0.44 | 0.30 |
| LASSO-小波系数 | 多元线性回归 | 0.50 | 0.33 | 0.27 | 0.53 | 0.33 | 0.27 |
| XGBoost | 0.76 | 0.24 | 0.18 | 0.60 | 0.31 | 0.25 |
| SVM | 0.83 | 0.19 | 0.12 | 0.72 | 0.26 | 0.18 |
| ANN | 0.88 | 0.16 | 0.12 | 0.41 | 0.39 | 0.31 |
| KNN | 0.62 | 0.26 | 0.22 | 0.58 | 0.31 | 0.24 |
), ArticleFig(id=1241057244217921975, tenantId=1146029695717560320, journalId=1234093305789726721, articleId=1241057220608185108, language=CN, label=表7, caption=
植被氮含量预测模型的精度检验
, figureFileSmall=null, figureFileBig=null, tableContent=
| 输入变量 | 模型 | T-R2 | T-RMSE | T-MAE | V-R2 | V-RMSE | V-MAE |
|---|
| LASSO-植被指数 | 多元线性回归 | 0.38 | 0.37 | 0.29 | 0.43 | 0.38 | 0.29 |
| XGBoost | 0.71 | 0.26 | 0.19 | 0.60 | 0.30 | 0.21 |
| SVM | 0.72 | 0.26 | 0.17 | 0.68 | 0.28 | 0.19 |
| ANN | 0.72 | 0.24 | 0.18 | 0.68 | 0.27 | 0.19 |
| KNN | 0.72 | 0.24 | 0.17 | 0.65 | 0.28 | 0.19 |
| LASSO-“三边参数” | 多元线性回归 | 0.36 | 0.38 | 0.30 | 0.26 | 0.41 | 0.34 |
| XGBoost | 0.57 | 0.32 | 0.25 | 0.50 | 0.36 | 0.29 |
| SVM | 0.61 | 0.29 | 0.18 | 0.63 | 0.27 | 0.19 |
| ANN | 0.63 | 0.29 | 0.20 | 0.64 | 0.29 | 0.22 |
| KNN | 0.64 | 0.28 | 0.21 | 0.55 | 0.32 | 0.22 |
| LASSO-统去除参数 | 多元线性回归 | 0.26 | 0.41 | 0.33 | 0.28 | 0.42 | 0.32 |
| XGBoost | 0.42 | 0.37 | 0.30 | 0.20 | 0.44 | 0.32 |
| SVM | 0.42 | 0.37 | 0.27 | 0.20 | 0.43 | 0.32 |
| ANN | 0.44 | 0.35 | 0.26 | 0.22 | 0.42 | 0.30 |
| KNN | 0.55 | 0.32 | 0.24 | 0.18 | 0.44 | 0.30 |
| LASSO-小波系数 | 多元线性回归 | 0.50 | 0.33 | 0.27 | 0.53 | 0.33 | 0.27 |
| XGBoost | 0.76 | 0.24 | 0.18 | 0.60 | 0.31 | 0.25 |
| SVM | 0.83 | 0.19 | 0.12 | 0.72 | 0.26 | 0.18 |
| ANN | 0.88 | 0.16 | 0.12 | 0.41 | 0.39 | 0.31 |
| KNN | 0.62 | 0.26 | 0.22 | 0.58 | 0.31 | 0.24 |
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