航空機搭載型 Scanning lidar システムを用いた樹高計測 : 計測条件の違いが樹高計測精度に与える影響についての検討

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Effects of difference in measurement conditions of airborne scanning lidar systems on the accuracy of the tree heights estimation were investigated to improve the measurement efficiency. At the condition on the flight altitude of 300 m, footprint diameter was small (0.3 m) with low flight speed (60 km/h) and footprint interval of laser beams was set to almost same as the footprint diameter in order to thoroughly scan target canopies. For more efficient measurement, flight speed was raised up to 90 km/h at 500 m altitude condition. In the case, the footprint diameter was also expanded up to 0.5 m, so that footprint interval was almost same as the diameter, as was in 300 m altitude condition. At the condition on 900 m altitude, flight speed was much more raised to 230 km/h, so that the footprint interval became larger than the diameter. After the measurements, tree heights were estimated from the digital canopy height models produced from lidar data obtained at each of the conditions. The root mean square errors of the 166 tree heights estimation were 0.27, 0.30 and 2.38 m for the conditions of 300, 500 and 900 m altitude, respectively. These results showed that, when flight speed is raised for more efficient measurement, it is important for sizes of footprint diameter and interval to be set to almost same to obtain accurate results. It was also shown that tree height estimation with less error can be provided up to 0.5 m footprint diameter by adopting the almost same sizes of the footprint diameter and interval.
生態工学会の論文
2008-10-31

航空機搭載型 Scanning lidar システムを用いた樹高計測 : 計測条件の違いが樹高計測精度に与える影響についての検討

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