Measuring forest canopy height using ICESat/GLAS data for applying to Japanese spaceborne LiDAR mission

Masato Hayashi, Nobuko Saigusa, Hiroyuki Oguma, Yoshiki Yamagata, Gen Takao, Haruo Sawada, Kohei Mizutani, Nobuo Sugimoto, Kazuhiro Asai

研究成果: Conference contribution

1 被引用数 (Scopus)

抄録

We developed a methodology to estimate the canopy height from the ICESat/GLAS waveform for the purpose of contributing to the design of the Japanese spaceborne LiDAR mission; iss-jem LiDAR for Observation of Vegetation Environment (i-LOVE). We adopted an estimation method using a terrain index, which indicates the steepness of ground surface, to accurately estimate the canopy height in sloped areas. The study area is Hokkaido Island. We conducted a ground survey and collected airborne LiDAR data to use as the ground truth for the canopy height. We then developed some models to estimate the canopy height from a GLAS waveform. As a result, the estimation accuracy decreased in steep sloped areas where the terrain index exceeded 15 m. To reduce the influence of this effect, the estimation equation was separated for a gentle slope (terrain index ≤ 15 m) and a steep slope (terrain index 15 m). In this case, RMSE was 3 to 5 m. These findings indicated that an accurate estimation method would be ensured by using a footprint of less than 15 m of terrain index for the i-LOVE mission. On the assumption of a forested area located primarily at less than a 30° surface slope on a global scale, it is recommended that the diameter of the i-LOVE footprint should be less than 25 m. iLOVE is planned to transmit four laser pulses arranged at 2x2 simultaneously. This characteristic of i-LOVE, which does not require DEM, makes it possible to calculate the terrain index accurately and has a large advantage for accurately estimating the canopy height on a global scale.

本文言語English
ホスト出版物のタイトルLidar Remote Sensing for Environmental Monitoring XIII
出版社SPIE
ISBN(印刷版)9780819492654
DOI
出版ステータスPublished - 2012
外部発表はい
イベントLidar Remote Sensing for Environmental Monitoring XIII - Kyoto, Japan
継続期間: 2012 10月 292012 10月 31

出版物シリーズ

名前Proceedings of SPIE - The International Society for Optical Engineering
8526
ISSN(印刷版)0277-786X
ISSN(電子版)1996-756X

Conference

ConferenceLidar Remote Sensing for Environmental Monitoring XIII
国/地域Japan
CityKyoto
Period12/10/2912/10/31

ASJC Scopus subject areas

  • 電子材料、光学材料、および磁性材料
  • 凝縮系物理学
  • コンピュータ サイエンスの応用
  • 応用数学
  • 電子工学および電気工学

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