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智能手机APP与数字半球摄影测量叶面积指数对比研究

洪楚翘,屈永华

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洪楚翘, 屈永华. 智能手机APP与数字半球摄影测量叶面积指数对比研究[J]. 华体会外围 (自然科学版). doi: 10.12202/j.0476-0301.2021232
引用本文: 洪楚翘, 屈永华. 智能手机APP与数字半球摄影测量叶面积指数对比研究[J]. 华体会外围 (自然科学版).doi:10.12202/j.0476-0301.2021232
HONG Chuqiao, QU Yonghua. Comparison of Smartphone APP and Digital Hemispherical Photography for estimating leaf area index[J]. Journal of Beijing Normal University(Natural Science). doi: 10.12202/j.0476-0301.2021232
Citation: HONG Chuqiao, QU Yonghua. Comparison of Smartphone APP and Digital Hemispherical Photography for estimating leaf area index[J].Journal of Beijing Normal University(Natural Science).doi:10.12202/j.0476-0301.2021232

智能手机APP与数字半球摄影测量叶面积指数对比研究

doi:10.12202/j.0476-0301.2021232
基金项目:国家自然科学基金项目(41671333);国家重点研发计划项目(2016YFC0500103)
详细信息
    通讯作者:

    屈永华(1972-),男,博士,副教授. 研究方向:定量遥感. E-mail:qyh@bnu.edu.cn

  • 中图分类号:TP391.4

Comparison of Smartphone APP and Digital Hemispherical Photography for estimating leaf area index

  • 摘要:基于自主开发的智能手机APP(LAISmart)对针阔混交林、阔叶林和农作物3种植被类型的叶面积指数(leaf area index, LAI)进行测量,并以数字半球摄影(digital hemispherical photography,DHP)的测量结果作为参考值进行对比分析.结果表明,虽然LAISmart与DHP的LAI值总体上具有高度一致性( R 2=0.95,RMSE=0.68 m 2·m −2),但是,LAISmart的性能受到植被叶片密集程度的影响.我们发现,LAI大于3.9 m 2·m −2时,LAISmart会明显低估DHP的测量结果.智能手机成像传感器的自动曝光模式是引起LAISmart低估高值区域LAI的重要影响因素,当对高值区域的LAISmart图像进行降低曝光度处理后,LAISmart和DHP的偏差得到进一步降低,且LAISmart的精度提高了49%左右.此外,LAISmart的较窄视场角几乎不会对其测量结果产生影响.研究表明,若能在调节智能手机曝光度的条件下使用LAISmart,则具有更高效率和更低成本优势的LAISmart可以成为替代DHP的有效方法.

  • 图 1试验区分布及样方采样方法

    图 5LAISmart与DHP的LAI值之间的散点图

    图 2LAISmart和DHP获取植被冠层图像的示意图

    图 3图像间隙斑块标准化面积计算示意图

    图 4LAISmart和DHP阔叶林图像的间隙斑块标准化面积频率分布

    图 6在X=3.9左右两侧测量点中,LAISmart与DHP的LAI偏差频率

    图 7在X=3.9右侧测量点中,降低曝光度后的LAISmart与DHP的LAI偏差频率(平均偏差为0.46 m2·m−2

    图 8当LAI>3.9 m2·m−2时,降低曝光度前后的LAISmart与DHP的间隙率差值(LAISmart-DHP)频率

    图 9高密度覆盖植被中阔叶林降低曝光度前后的LAISmart图像示例

    图 10LAISmart和DHP在3种植被类型图像中大间隙斑块标准化面积的频率分布

    表 1试验区概况及获取的数据集详情

    数据集 省份 植被类型 植被名称 样方数量 经度 纬度 拍摄日期
    G1 福建省 针阔混交林 相思树(Acacia confusa)和
    马尾松(Pinus massoniana)
    35 118.110°E 24.504°N 2020-03-08—04-26
    G2 内蒙古自治区 阔叶林 胡杨(Populus euphratica) 8 101.135°E 41.990°N 2020-07-13—07-24
    G3 甘肃省 农作物 玉米(Zea mays) 18 100.376°E 38.858°N 2020-07-17—07-22
    G4 重庆市 阔叶林 桂树(Osmanthus fragrans) 16 106.315°E 29.756°N 2020-10-18—10-19
    下载: 导出CSV

    表 22种DHP设备详情及获取的数据集

    DHP设备 数字单反相机型号 鱼眼镜头型号 视场角 图像分辨率 获取的数据集
    第1种 Canon EOS 6D Samyang 8mm f/3.5 180° 5472×3648 G1、G2、G3
    第2种 Canon EOS 40D Canon EF 15mm f/2.8 120° 2886×1880 G4
    下载: 导出CSV

    表 3LAISmart和DHP阔叶林图像中大小间隙斑块标准化面积与个数

    间隙斑块标准化面积分类 仪器 斑块总面积 面积比例 /% 斑块个数 个数比例 /%
    <0.006(小间隙) LAISmart 7.15 30.19 174636 99.83
    DHP 5.92 27.47 398617 99.93
    >0.006(大间隙) LAISmart 16.54 69.81 302 0.17
    DHP 15.62 72.53 294 0.07
    下载: 导出CSV

    表 4LAISmart和DHP在各个相对应区间内总面积数的配对t检验结果

    植被类型 H p CI_2.5 CI_97.5
    针阔混交林 0 0.666 −0.008 0.013
    阔叶林 0 0.726 −0.008 0.012
    农作物 0 0.541 −0.004 0.008
    下载: 导出CSV
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  • 收稿日期:2021-09-17
  • 录用日期:2021-09-17
  • 网络出版日期:2022-06-14

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