浙江农业学报 ›› 2021, Vol. 33 ›› Issue (5): 861-872.DOI: 10.3969/j.issn.1004-1524.2021.05.12
张矞勋1,2(), 王磊1,2,*(
), 璩向宁1,2, 曹媛1,2, 吴梦瑶1,2, 于瑞鑫1,2, 孙源3
收稿日期:
2020-09-25
出版日期:
2021-05-25
发布日期:
2021-05-25
通讯作者:
王磊
作者简介:
*王磊,E-mail:WL8999@163.com基金资助:
ZHANG Yuxun1,2(), WANG Lei1,2,*(
), QU Xiangning1,2, CAO Yuan1,2, WU Mengyao1,2, YU Ruixin1,2, SUN Yuan3
Received:
2020-09-25
Online:
2021-05-25
Published:
2021-05-25
Contact:
WANG Lei
摘要:
叶面积指数(leaf area index,LAI)是植被冠层重要的结构参数之一,与冠层生理过程密切相关,也是植被遥感领域关注的重要参数之一。本研究对已在轨运行7年的高分一号卫星WFV传感器的植被监测性能进行评测,以吉林省农安县典型玉米分布区作为研究区域,结合地面同步观测的叶面积指数和冠层光谱等实测数据,借助归一化植被指数(NDVI)、比植被指数(RVI)、大气阻抗植被指数(ARVI)、土壤调节植被指数(SAVI)、修改性土壤调节植被指数(MSAVI)这5种植被指数,对比分析地面实测光谱与GF-1/WFV光谱对玉米冠层叶面积指数的估算能力。通过决定系数(R2)、均方根误差(RMSE)、相对误差(RE)和预测残差(RPD)等参数筛选最优模型。研究结果显示,各种植被指数与LAI之间的相关性均表现为地面实测光谱高于GF-1/WFV星载光谱;对比不同植被指数与LAI的相关性发现,地面光谱和星上光谱构造的植被指数中,均表现为MSAVI与LAI的相关性最高;基于地面光谱和星上光谱的MSAVI构建的估算模型中,R2最高值所对应的函数类型不同,基于地面光谱的函数中,R2最高值对应的是指数模型,而基于GF-1/WFV星上光谱的函数中,二项式的R2最高。
中图分类号:
张矞勋, 王磊, 璩向宁, 曹媛, 吴梦瑶, 于瑞鑫, 孙源. GF-1/WFV在玉米叶面积指数估算中的应用研究[J]. 浙江农业学报, 2021, 33(5): 861-872.
ZHANG Yuxun, WANG Lei, QU Xiangning, CAO Yuan, WU Mengyao, YU Ruixin, SUN Yuan. Application research of GF-1/WFV data in estimation of maize leaf area index[J]. Acta Agriculturae Zhejiangensis, 2021, 33(5): 861-872.
植被指数 Vegetation index | 函数类型 Function type | 实测光谱数据Measured spectrum data | 高分一号GF-1 | ||
---|---|---|---|---|---|
R2 | 调整R2 Residual sum of squares | R2 | 调整R2 Residual sum of squares | ||
NDVI | 线性Linear function | 0.738 | 0.722 | 0.625 | 0.609 |
对数Logarithmic function | 0.737 | 0.728 | 0.635 | 0.620 | |
二次Quadratic function | 0.737 | 0.708 | 0.685 | 0.657 | |
幂Power function | 0.747 | 0.734 | 0.613 | 0.579 | |
指数Exponential function | 0.757 | 0.740 | 0.602 | 0.585 | |
RVI | 线性Linear function | 0.700 | 0.687 | 0.548 | 0.530 |
对数Logarithmic function | 0.736 | 0.722 | 0.592 | 0.576 | |
二次Quadratic function | 0.731 | 0.712 | 0.669 | 0.642 | |
幂Power function | 0.718 | 0.704 | 0.583 | 0.566 | |
指数Exponential function | 0.693 | 0.677 | 0.534 | 0.515 | |
ARVI | 线性Linear function | 0.687 | 0.653 | 0.680 | 0.667 |
对数Logarithmic function | 0.649 | 0.636 | 0.682 | 0.669 | |
二次Quadratic function | 0.670 | 0.648 | 0.682 | 0.657 | |
幂Power function | 0.688 | 0.680 | 0.674 | 0.661 | |
指数Exponential function | 0.716 | 0.704 | 0.671 | 0.657 | |
SAVI | 线性Linear function | 0.771 | 0.760 | 0.671 | 0.655 |
对数Logarithmic function | 0.765 | 0.754 | 0.682 | 0.667 | |
二次Quadratic function | 0.764 | 0.732 | 0.714 | 0.685 | |
幂Power function | 0.763 | 0.751 | 0.654 | 0.638 | |
指数Exponential function | 0.757 | 0.745 | 0.642 | 0.625 | |
MSAVI | 线性Linear function | 0.808 | 0.798 | 0.676 | 0.650 |
对数Logarithmic function | 0.808 | 0.798 | 0.693 | 0.678 | |
二次Quadratic function | 0.808 | 0.787 | 0.742 | 0.716 | |
幂Power function | 0.812 | 0.802 | 0.665 | 0.639 | |
指数Exponential function | 0.814 | 0.804 | 0.656 | 0.619 |
表1 植被指数不同函数类型相关性对比
Table 1 Correlation comparison of different function types of vegetation index
植被指数 Vegetation index | 函数类型 Function type | 实测光谱数据Measured spectrum data | 高分一号GF-1 | ||
---|---|---|---|---|---|
R2 | 调整R2 Residual sum of squares | R2 | 调整R2 Residual sum of squares | ||
NDVI | 线性Linear function | 0.738 | 0.722 | 0.625 | 0.609 |
对数Logarithmic function | 0.737 | 0.728 | 0.635 | 0.620 | |
二次Quadratic function | 0.737 | 0.708 | 0.685 | 0.657 | |
幂Power function | 0.747 | 0.734 | 0.613 | 0.579 | |
指数Exponential function | 0.757 | 0.740 | 0.602 | 0.585 | |
RVI | 线性Linear function | 0.700 | 0.687 | 0.548 | 0.530 |
对数Logarithmic function | 0.736 | 0.722 | 0.592 | 0.576 | |
二次Quadratic function | 0.731 | 0.712 | 0.669 | 0.642 | |
幂Power function | 0.718 | 0.704 | 0.583 | 0.566 | |
指数Exponential function | 0.693 | 0.677 | 0.534 | 0.515 | |
ARVI | 线性Linear function | 0.687 | 0.653 | 0.680 | 0.667 |
对数Logarithmic function | 0.649 | 0.636 | 0.682 | 0.669 | |
二次Quadratic function | 0.670 | 0.648 | 0.682 | 0.657 | |
幂Power function | 0.688 | 0.680 | 0.674 | 0.661 | |
指数Exponential function | 0.716 | 0.704 | 0.671 | 0.657 | |
SAVI | 线性Linear function | 0.771 | 0.760 | 0.671 | 0.655 |
对数Logarithmic function | 0.765 | 0.754 | 0.682 | 0.667 | |
二次Quadratic function | 0.764 | 0.732 | 0.714 | 0.685 | |
幂Power function | 0.763 | 0.751 | 0.654 | 0.638 | |
指数Exponential function | 0.757 | 0.745 | 0.642 | 0.625 | |
MSAVI | 线性Linear function | 0.808 | 0.798 | 0.676 | 0.650 |
对数Logarithmic function | 0.808 | 0.798 | 0.693 | 0.678 | |
二次Quadratic function | 0.808 | 0.787 | 0.742 | 0.716 | |
幂Power function | 0.812 | 0.802 | 0.665 | 0.639 | |
指数Exponential function | 0.814 | 0.804 | 0.656 | 0.619 |
数据 Data | 植被指数 Vegetation index | 函数类型 Function type | R2 | 调整R2 Residual sum of squares |
---|---|---|---|---|
实测光谱数据 | NDVI | 指数Exponential function | 0.757 | 0.740 |
Measured spectrum data | RVI | 对数Logarithmic function | 0.736 | 0.722 |
ARVI | 指数Exponential function | 0.716 | 0.704 | |
SAVI | 线性Linear function | 0.771 | 0.760 | |
MSAVI | 指数Exponential function | 0.814 | 0.804 | |
高分一号 | NDVI | 二次Quadratic function | 0.684 | 0.657 |
GF-1/WFV | RVI | 二次Quadratic function | 0.669 | 0.642 |
ARVI | 对数Logarithmic function | 0.682 | 0.669 | |
SAVI | 二次Quadratic function | 0.714 | 0.685 | |
MSAVI | 二次Quadratic function | 0.742 | 0.716 |
表2 实测光谱数据和GF-1/WFV传感器数据植被指数模型的最优函数类型
Table 2 Optimal function type of vegetation index model based on measurement spectral data and GF-1/WFV sensor data
数据 Data | 植被指数 Vegetation index | 函数类型 Function type | R2 | 调整R2 Residual sum of squares |
---|---|---|---|---|
实测光谱数据 | NDVI | 指数Exponential function | 0.757 | 0.740 |
Measured spectrum data | RVI | 对数Logarithmic function | 0.736 | 0.722 |
ARVI | 指数Exponential function | 0.716 | 0.704 | |
SAVI | 线性Linear function | 0.771 | 0.760 | |
MSAVI | 指数Exponential function | 0.814 | 0.804 | |
高分一号 | NDVI | 二次Quadratic function | 0.684 | 0.657 |
GF-1/WFV | RVI | 二次Quadratic function | 0.669 | 0.642 |
ARVI | 对数Logarithmic function | 0.682 | 0.669 | |
SAVI | 二次Quadratic function | 0.714 | 0.685 | |
MSAVI | 二次Quadratic function | 0.742 | 0.716 |
数据 Data | 植被指数 Vegetation index | 函数类型 Function type | 表达式 Expression |
---|---|---|---|
实测光谱数据 | NDVI | 指数Exponential function | y =0.0493e4.7955x |
Measured spectrum data | RVI | 对数Logarithmic function | y=1.9421ln(x)-1.9457 |
ARVI | 指数Exponential function | y=0.1341e3.8751x | |
SAVI | 线性Linear function | y =12.197x-12.596 | |
MSAVI | 指数Exponential | y =0.0019e8.0142x | |
高分一号 | NDVI | 二次Polynomial function | y =-105.51x2+166.75x - 61.886 |
GF-1/WFV | RVI | 二次Polynomial function | y=-0.1668x2+2.6269x-6.4054 |
ARVI | 对数Logarithmic function | y=8.3808ln(x)+5.9208 | |
SAVI | 二次Polynomial function | y=-116.16x2+123.92x - 28.995 | |
MSAVI | 二次Polynomial function | y=-96.689x2+102.23x - 22.956 |
表3 实测光谱数据和GF-1/WFV传感器数据计算植被指数与LAI的拟合方程
Table 3 Fitting equation of LAI and vegetation index constructed by measured spectral data and GF-1/WFV sensor data
数据 Data | 植被指数 Vegetation index | 函数类型 Function type | 表达式 Expression |
---|---|---|---|
实测光谱数据 | NDVI | 指数Exponential function | y =0.0493e4.7955x |
Measured spectrum data | RVI | 对数Logarithmic function | y=1.9421ln(x)-1.9457 |
ARVI | 指数Exponential function | y=0.1341e3.8751x | |
SAVI | 线性Linear function | y =12.197x-12.596 | |
MSAVI | 指数Exponential | y =0.0019e8.0142x | |
高分一号 | NDVI | 二次Polynomial function | y =-105.51x2+166.75x - 61.886 |
GF-1/WFV | RVI | 二次Polynomial function | y=-0.1668x2+2.6269x-6.4054 |
ARVI | 对数Logarithmic function | y=8.3808ln(x)+5.9208 | |
SAVI | 二次Polynomial function | y=-116.16x2+123.92x - 28.995 | |
MSAVI | 二次Polynomial function | y=-96.689x2+102.23x - 22.956 |
图3 基于地面实测光谱模拟GF-1/WFV波段数据预测模型散点图及拟合曲线
Fig.3 Scatter plot map and curve fitting of predicted model based on measured spectral data of GF-1/WFV analog band
指标 Index | 数据来源 Data sources | NDVI | RVI | ARVI | SAVI | MSAVI |
---|---|---|---|---|---|---|
RE | 高分一号GF-1/WFV | 0.0614 | 0.0665 | 0.0709 | 0.0590 | 0.0581 |
实测光谱Measured spectrum | 0.0563 | 0.0560 | 0.0588 | 0.0548 | 0.0476 | |
RPD | 高分一号GF-1/WFV | 1.6070 | 1.5471 | 1.4936 | 1.7035 | 1.7108 |
实测光谱Measured spectrum | 1.7379 | 1.7100 | 1.6533 | 1.7573 | 2.0986 | |
RMSE | 高分一号GF-1/WFV | 0.2621 | 0.2675 | 0.2937 | 0.2508 | 0.2502 |
实测光谱Measured spectrum | 0.2372 | 0.2340 | 0.2561 | 0.2293 | 0.2082 |
表4 估算模型精度
Table 4 Accuracy of estimation models
指标 Index | 数据来源 Data sources | NDVI | RVI | ARVI | SAVI | MSAVI |
---|---|---|---|---|---|---|
RE | 高分一号GF-1/WFV | 0.0614 | 0.0665 | 0.0709 | 0.0590 | 0.0581 |
实测光谱Measured spectrum | 0.0563 | 0.0560 | 0.0588 | 0.0548 | 0.0476 | |
RPD | 高分一号GF-1/WFV | 1.6070 | 1.5471 | 1.4936 | 1.7035 | 1.7108 |
实测光谱Measured spectrum | 1.7379 | 1.7100 | 1.6533 | 1.7573 | 2.0986 | |
RMSE | 高分一号GF-1/WFV | 0.2621 | 0.2675 | 0.2937 | 0.2508 | 0.2502 |
实测光谱Measured spectrum | 0.2372 | 0.2340 | 0.2561 | 0.2293 | 0.2082 |
植被指数 Vegetation index | 高分一号 GF-1 | 实测光谱 Measured spectrum |
---|---|---|
NDVI | 0.833** | 0.854** |
RVI | 0.806** | 0.858** |
ARVI | 0.825** | 0.781** |
SAVI | 0.853** | 0.862** |
MSAVI | 0.857** | 0.894** |
表5 地面实测光谱和GF-1/WFV的LAI观测值与预测值相关性
Table 5 Correlation between LAI observed values and predicted values of ground measured spectral data and GF-1/WFV
植被指数 Vegetation index | 高分一号 GF-1 | 实测光谱 Measured spectrum |
---|---|---|
NDVI | 0.833** | 0.854** |
RVI | 0.806** | 0.858** |
ARVI | 0.825** | 0.781** |
SAVI | 0.853** | 0.862** |
MSAVI | 0.857** | 0.894** |
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