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为了测量高覆盖条件下(LAI=5)玉米冠层的方向孔隙率,利用一台基于工业用吊车平台的窄视角热红外成像仪开展测量。在此基础上建立了一个几何光学和辐射传输混合模型模拟半球空间的孔隙率分布。测量结果表明,大多数的孔隙出现在邻近的植株行之间,这导致了在热红外图像中,冠层还保持着垄行结构的特征。基于已经得到的几何参数,本研究发展的模型具有垄行作物孔隙率分布特征,模拟的孔隙率与被观测的孔隙率保持很好的一致。更进一步的改进,需通过计算机模拟以建立更加真实的作物结构描述,这也是以后的一个研究方向。
To measure the directional porosity of corn canopy under high coverage (LAI = 5), measurements were made using a narrow-view thermal infrared imager based on an industrial crane platform. On this basis, a hybrid model of geometrical optics and radiative transfer was established to simulate the porosity distribution in hemispherical space. The measurements show that most of the pores appear between adjacent rows of plants, which results in the canopy that retains the characteristics of ridge structures in thermal infrared images. Based on the geometric parameters that have been obtained, the model developed in this study has the characteristics of the porosity distribution of ridged crops, and the simulated porosity remains in good agreement with the observed porosity. Further improvements need to be simulated by computer to establish a more realistic description of crop structure, which is also a research direction later.