The International Archives of the Photogrammetry, Remote Sensing and Spatial Information Sciences
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Articles | Volume XXXVIII-5/W12
Int. Arch. Photogramm. Remote Sens. Spatial Inf. Sci., XXXVIII-5/W12, 209–212, 2011
https://doi.org/10.5194/isprsarchives-XXXVIII-5-W12-209-2011
Int. Arch. Photogramm. Remote Sens. Spatial Inf. Sci., XXXVIII-5/W12, 209–212, 2011
https://doi.org/10.5194/isprsarchives-XXXVIII-5-W12-209-2011
 
05 Sep 2012
05 Sep 2012

VOXEL-BASED ESTIMATION OF PLANT AREA DENSITY FROM AIRBORNE LASER SCANNER DATA

Y. Song, M. Maki, J. Imanishi, and Y. Morimoto Y. Song et al.
  • Graduate School of Global Environment Studies, Kyoto University, Kyoto, 606-8501, Japan

Keywords: Canopy structure, Three-dimensional (3-D), Flight line, Lidar, Plant area index, Crown volume

Abstract. Three-dimensional distribution of plant area density (PAD) was retrieved using airborne laser scanning (ALS) data. The calculation of PAD requires the number of laser-pulses intercepted by plant materials and which are not intercepted by trees (i.e., passed laser-pulses) for the spatial unit. To estimate the passed laser-pulses at a voxel (1-m voxel in this study), we traced every laser-return by using its flight line information. The assumption was that every laser-pulse traveled on the orthogonal line to flight line, meaning that the sensor mounted in the aircraft scanned perpendicularly to its flight line. Our function based on this assumption allowed PAD to be calculated. Consequently, we successfully obtained the PAD profiles at every 1-m voxel for the canopy area of 56 trees, which could be useful in the quantitative assessment of canopy structure at a broad scale.