| 模型ID： | M00038 | ||||||
| 模型名称： | 激光雷达回波模型 | ||||||
| 模型编码者： |
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| 模型关键字： | 森林、激光雷达、回波波形 | ||||||
| 模型类型： | 理论模型 | ||||||
| 模型最后修改日期： | 2014/9/17 0:00:00 | ||||||
| 模型提交日期： | 1998/11/3 0:00:00 | ||||||
| 模型摘要： | 激光雷达回波模型是由马里兰大学地理系 孙国清教授和美国宇航局戈达德飞行中心的Kenneth Jon Ranson 教授与2000年建立的。该模型建立在由体元构建的三维森林场景的基础上，可模拟植被的激光雷达回波波形。 | ||||||
| 公式： |
| 1 |
名称：体元水平大小
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参数类型：double
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物理意义：体元水平大小
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| 2 |
名称：树种数
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参数类型：int
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物理意义：树种数
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| 3 |
名称：地表反射率
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参数类型：double
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物理意义：地表反射率
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| 4 |
名称：地形的坡度
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参数类型：int
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物理意义：地形的坡度
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| 5 |
名称：场景的大小与最大高
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参数类型：int
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物理意义：场景的大小与最大高
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| 标题： | Modeling lidar returns from forest canopies | ||||||||||||
| 文献作者： |
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| 文献引用： | Geoscience and Remote Sensing, IEEE Transactions on | ||||||||||||
| 文献摘要: | Remote sensing techniques that utilize light detection and ranging (lidar) provide unique data on canopy geometry and subcanopy topography. This type of information will lead to improved understanding of important structures and processes of Earth's vegetation cover. To understand the relation between canopy structure and the lidar return waveform, a three-dimensional (3D) model was developed and implemented. Detailed field measurements and forest growth model simulations of forest stands were used to parameterize this vegetation lidar waveform model. In the model, the crown shape of trees determines the vertical distribution of plant material and the corresponding lidar waveforms. Preliminary comparisons of averaged waveforms from an airborne lidar and model simulations shows that the shape of the measured waveform was more similar to simulations using an ellipsoid or hemi-ellipsoid shape. The observed slower decay of the airborne lidar waveforms than the simulated waveforms may indicate the existence of the understories and may also suggest that higher order scattering from the upper canopy may contribute to the lidar signals. The lidar waveforms from stands simulated from a forest growth model show the dependence of the waveform on stand structure. |
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