Development of Measurement System for the Carbon Sinks under the Kyoto Protocol-Measurement of 3D Imaging Sensor Data using the Method of Cylinder Reconstruction Model from Range Points

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  • 京都議定書に関わる吸収源計測システムの開発 : 地上レーザスキャナによる点群モデルを用いた計測手法の検討
  • キョウト ギテイショ ニ カカワル キュウシュウ ゲン ケイソク システム ノ カイハツ チジョウ レーザスキャナ ニ ヨル テングン モデル オ モチイタ ケイソク シュホウ ノ ケントウ

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To develop a monitoring system for the carbon sinks under the Kyoto Protocol, we examined a method of forest stand measurement using a 3D imaging sensor. The tree number, DBH and coordinate of trees were measured by the method of cylinder reconstruction, and the accuracy and precision were examined. The precision of coordinate was less than 8cm. In a short distance from the scanner, the precision of DBH was less than 1cm, and accuracy was less than 4.3cm. These results of coordinate and DBH had accuracy and precision sofficient to measure the forest stand as for as in a small area. Thus, this method is effective as a tool for remote sensing to investigate stands in small area and many sites. However, since the observed tree number was only 20-80% of the actual value, the estimated stem volume and carbon weight were not reliable. The next step of this study is to develop a method to remove the influence of non-counted trees, and combination with airborne sensing technology.

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