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| 1 | 基于机载LiDAR数据的玉米叶面积指数反演显示文摘以机载LiDAR离散点云数据为数据源,基于植被冠层孔隙率与叶面积指数的关系,提出一种反演大田玉米叶面积指数的方法。对反演LAI和实测LAI进行对比分析,结果表明:基于Axelsson改进的不规则三角格网加密方法可以将地面点和非地面点分开,结合高分辨率影像能够提取出玉米冠层点云;基于孔隙率反演LAI,尼尔逊参数的选择对结果影响很大,利用扫描天顶角模拟尼尔逊参数,LAI反演结果接近于真实情况。利用机载LiDAR点云数据能精确地反演大田玉米LAI,该研究方法适用于中等高度的农作物,可以扩展到甜菜、甘蔗等其他中等高度农作物。 | 刘婷 苏伟 王成 刘睿 李治 姜方方 | 2016 | 中国农业大学学报2016,21,3: | 11 |
| 2 | A unified model of bidirectional reflectance distribution function for the vegetation canopy显示文摘An accurate and operational bidirectional reflectance distribution function(BDRF) canopy model is the basis of quantitative vegetation remote sensing.The canopy reflectance should be approximated as the sum of the single scattering reflectance arising from the sun,ρ~1,and the multiple scattering reflectance arising from the canopy,ρ~m,as their directional characteristics are dramatically different.Based on the existing BRDF model,we obtain a new analytical expression of ρ~1 and ρ~m in this paper,which is suitable for different illumination conditions and different vegetation canopies.According to the geometrical optic model at the leaf scale,the anisotropy of ρ~1 can be ascribed to the geometry of the object,sun and the sensor,multiple scale clumping,and the fraction of direct solar radiation and diffuse sky radiation.Then,we parameterize the area ratios of four components:the sunlit foliage,sunlit ground,shadow foliage and shadow ground based on a Poisson distribution,and develop a new approximate analytical single scattering reflectance model.Assuming G=0.5,a recollision probability theory based scattering model is developed which considers the effects of diffuse sky radiation,scattering inside the canopy and rebounds between the canopy and soil.Validation using ground measurements of maize and black spruce forest proves the reliability of the model. | XU XiRu FAN WenJie LI JuCai ZHAO Peng CHEN GaoXing | 2017 | Science China Earth Sciences2017,60,3: | 3 |
| 3 | 三维冠层BRF模型构建与模拟显示文摘三维辐射传输模型能准确刻画异质性植被冠层对太阳辐射的散射,这对利用高空间分辨率光学影像进行植被参数的定量反演具有重要的指导意义。本文基于具有真实植株统计特征的概率株进行三维植被冠层的构建,通过合理设计光能粒子在冠层内的传输过程并结合蒙特卡洛光线追踪技术和冠层孔隙率计算方法,建立了三维冠层辐射传输模型,并利用该模型对不同生长期玉米冠层多角度二向性反射因子BRF (Bidirectional Reflectance Function)进行了模拟。与实测数据的对比结果表明,离散期、垄行期和均一期的玉米冠层BRF模拟结果与实测数据均保持了较好的一致性,红光波段BRF模拟值与实测值的RMSE为0.0085,R2为0.96,近红外波段模拟值与实测值的RMSE为0.013,R2为0.96。水平均一冠层BRF模拟结果与SAIL (Scattering by Arbitrarily Inclined Leaves)模型结果的对比表明,本文模型在光能粒子传输与能量计算方面的是合理准确的。本文发展的概率株三维辐射传输模型为研究异质性冠层BRF提供了一个有效手段,并可为植被生物量以及叶面积指数LAI(Leaf Area Index)等关键冠层参数的定量化反演与验证提供数据支撑。 | 马红章 孙淑怡 刘素美 艾璐 孙根云 孙林 | 2022 | 遥感学报2022,26,11: | 0 |
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