Characterization of Three Drone-mountable Multispectral Cameras Using a Canopy Radiative Transfer Model to Observe Paddy Fields
Characterization of Three Drone-mountable Multispectral Cameras Using a Canopy Radiative Transfer Model to Observe Paddy Fields
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DOI：
10.3173/air.31.65
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发表时间：
2022-10
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影响因子：
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通讯作者：
M. Ishihara;Ji-Eon Lim;R. Sugiura;H. Tsunematsu
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作者：
M. Ishihara;Ji-Eon Lim;R. Sugiura;H. Tsunematsu
利用模拟水稻冠层反射率和植被指数（VIs）的PROSAIL冠层辐射传输模型，研究了三种无人机多光谱相机的特性。叶片面积指数（LAI）、漫射光比和太阳天顶角随生长阶段和光照环境的变化而变化，造成反射率和可见光的差异。每台相机的不同波长区域导致了红边波段的反射率和VIs的显著差异。在相同LAI条件下，散射光比和太阳天顶角的变化也会改变LAI值；因此，为了获得可靠的结果，必须设置合适的观测条件，让无人机使用多光谱相机进行航拍。使用红边波段的VIs受观测条件的影响最小，在高LAI时不容易饱和。然而，由于相机之间的反射率和VIs值的差异可以被校正，因此可以有效地使用无人机安装相机来观测稻田。
We used a canopy radiative transfer model, PROSAIL, with simulated paddy canopy reflectance and vegetation indices (VIs) to investigate the characteristics of three drone-mountable multispectral cameras. The leaf area index (LAI), diffuse light ratio, and solar zenith angle were varied to create differences in reflectance and VIs due to changes in the growth stage and light environ -ment. Different wavelength regions of each camera caused significant differences in both reflectance and VIs in the red edge band. Changes in the diffuse light ratio and solar zenith angle changed the values even at the same LAI; therefore, to obtain reliable re -sults, appropriate observation conditions must be set for aerial photography by drones with multispectral cameras. The VIs that use the red edge band were the least affected by the observation conditions, and were less likely to be saturated at high LAI. However, drone-mountable cameras can be effectively used to observe paddy fields because the differences in the values of reflectance and VIs among cameras can be corrected.