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Escaneamento laser aerotransportado para modelagem de terreno em floresta amaz?nica

机译：机载激光扫描在亚马逊雨林中进行地形建模

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Very few studies have been devoted to understanding the digital terrain model (DTM) creation for Amazon forests. DTM has a special and important role when airborne laser scanning is used to estimate vegetation biomass. We examined the influence of pulse density, spatial resolution, filter algorithms, vegetation density and slope on the DTM quality. Three Amazonian forested areas were surveyed with airborne laser scanning, and each original point cloud was reduced targeting to 20, 15, 10, 8, 6, 4, 2, 1, 0.75, 0.5 and 0.25 pulses per square meter based on a random resampling process. The DTM from resampled clouds was compared with the reference DTM produced from the original LiDAR data by calculating the deviation pixel by pixel and summarizing it through the root mean square error (RMSE). The DTM from resampled clouds were also evaluated considering the level of agreement with the reference DTM. Our study showed a clear trade-off between the return density and the horizontal resolution. Higher forest canopy density demanded higher return density or lower DTM resolution.
机译：很少有研究致力于了解亚马逊森林的数字地形模型（DTM）创建。当使用机载激光扫描估算植物生物量时，DTM具有特殊而重要的作用。我们检查了脉冲密度，空间分辨率，滤波器算法，植被密度和斜率对DTM质量的影响。使用机载激光扫描仪调查了三个亚马逊森林地区，并基于随机重采样将每个原始点云的目标减少为每平方米20、15、10、8、6、4、2、1、0.75、0.5和0.25个脉冲处理。通过逐像素计算偏差并通过均方根误差（RMSE）对其进行汇总，将重采样云的DTM与从原始LiDAR数据生成的参考DTM进行了比较。还考虑了与参考DTM的一致程度，对重采样云的DTM进行了评估。我们的研究表明，在返回密度和水平分辨率之间存在明显的权衡。较高的林冠密度要求较高的回波密度或较低的DTM分辨率。

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