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Citation:

Effects of Terra in on the Large Footpr in t L idarWaveform of Forests

  • Received Date: 2006-04-03
  • The large footp rint lidar has demonstrated its great potential for accurate estimation ofmany forest parameters. As the lidarwaveform is a record of return signal as a function of time from sensor to target, the terrain withinlidar footp rintwill affect the waveform through changing the distance of target to sensor and make effective footp rintarea larger. This paper simulated the effects of terrain on large footp rint lidarwaveform using a three dimensional lidar waveform model from forest. The analysis of ICEsat GLAS laser2b data ofNortheast 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 earlierwith 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 lidarwaveform would contain false vegetation peak at certain slope level. The relationship between waveform length andterrain slope was near linear. So the effects of terrain on lidarwavefrom could be corrected by subtracting a factor ofslope or terrain index.
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Effects of Terra in on the Large Footpr in t L idarWaveform of Forests

  • 1. Institute of Forest Resource Information Techniqus, CAF, Beijing 100091, China
  • 2. Department of Geography, University of Maryland, CollegePark, MD 20742,USA
  • 3. Department of Forest, Range andWatershed Stewardship, Colorado State University, Fort Collins, CO 80523, USA

Abstract: The large footp rint lidar has demonstrated its great potential for accurate estimation ofmany forest parameters. As the lidarwaveform is a record of return signal as a function of time from sensor to target, the terrain withinlidar footp rintwill affect the waveform through changing the distance of target to sensor and make effective footp rintarea larger. This paper simulated the effects of terrain on large footp rint lidarwaveform using a three dimensional lidar waveform model from forest. The analysis of ICEsat GLAS laser2b data ofNortheast 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 earlierwith 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 lidarwaveform would contain false vegetation peak at certain slope level. The relationship between waveform length andterrain slope was near linear. So the effects of terrain on lidarwavefrom could be corrected by subtracting a factor ofslope or terrain index.

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