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| 地形对大光斑激光雷达森林回波影响研究 | |
| 引用本文： | 庞勇,李增元,Sun Guoqing,Michael Lefsky,车学俭,陈尔学.地形对大光斑激光雷达森林回波影响研究[J].林业科学研究,2007,20(4):464-468. |
| 作者姓名： | 庞勇 李增元 Sun Guoqing Michael Lefsky 车学俭 陈尔学 |
| 作者单位： | 1. 中国林业科学研究院资源信息研究所,北京,100091 2. 马里兰大学地理系,马里兰 20742,美国 3. 科罗拉多州立大学森林、草地与流域系 科罗拉多 80523,美国 |
| 基金项目： | 国家自然科学基金，国家高技术研究发展计划(863计划)，中国林业科学院科研项目 |
| 摘 要： | 利用三维激光雷达森林回波波形模型模拟了地形对波形的影响,并用ICEsat GLAS的数据对模拟结果进行了验证.结果表明坡度对大光斑激光雷达波形影响较大,随着坡度的增大,地面回波和树冠回波都展宽,波形长度也随之增加,同时地面的波峰和植被的波峰值都降低,来自地面的回波明显减少,并逐渐与靠近地面的回波发生信息混叠.鉴于二者的关系呈近似线性正相关,在实际的森林参数反演中可望通过减去一个含有坡度或地形起伏度的因子进行地形效应纠正. |
| 关 键 词： | 地形 大光斑激光雷达 森林回波波形 |
| 文章编号： | 1001-1498（2007）04-0464-05 |
| 收稿时间： | 2006-04-03 |
| 修稿时间： | 2006年4月3日 |
Effects of Terra in on the Large Footpr in t L idarWaveform of Forests |
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| PANG Yong,LI Zeng-yuan,Sun Guoqing,Michael Lefsky,CHE Xue-jian and CHEN Er-xue.Effects of Terra in on the Large Footpr in t L idarWaveform of Forests[J].Forest Research,2007,20(4):464-468. | |
| Authors: | PANG Yong LI Zeng-yuan Sun Guoqing Michael Lefsky CHE Xue-jian and CHEN Er-xue |
| Institution: | 1. Institute of Forest Resource Information Techniqus, CAF, Beijing 100091, China; 2. Department of Geography, University of Maryland, College Park, MD 20742,USA; 3. Department of Forest, Range and Watershed Stewardship, Colorado State University, Fort Collins, CO 80523, USA |
| Abstract: | The large footprint lidar has demonstrated its great potential for accurate estimation of many forest parameters. As the lidar waveform is a record of return signal as a function of time from sensor to target, the terrain within lidar footprint will affect the waveform through changing the distance of target to sensor and make effective footprint area larger. This paper simulated the effects of terrain on large footprint lidar waveform using a three dimensional lidar waveform model from forest. The analysis of ICEsat GLAS laser2b data of Northeast China showed the same phenomena with simulated results. The results showed that both of the ground return signals and vegetation return signals were widened and the peak decreased with slope increasing. The return singles began earlier with slope increasing. Meanwhile, the slope angle from the signal beginning to first peak of the waveform decreased. These two phenomena caused the error in detecting signal beginning and the following forest height estimation. The recorded lidar waveform would contain false vegetation peak at certain slope level. The relationship between waveform length and terrain slope was near linear. So the effects of terrain on lidar wavefrom could be corrected by subtracting a factor of slope or terrain index. |
| Keywords: | ICEsat GLAS |
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