Extracting height and crown area of single tree in broadleaved forest by application of airborne laser scanner system

Tsai, Bien; Akiyama, Tsuyoshi; Wei, Hong

doi:10.4287/jsprs.45.3_4

Cited by 2 publications

(1 citation statement)

References 9 publications

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“…The manual control of forest area is not so easy under few labors so that remotely sensed data have been used for decades to estimation forest parameters in support of their management. At present, measurement of aerial photographs using stereoscopic instruments is the most commonly used method for acquisition of tree height (Tsai et al, 2006). However, this method is based on manual work and relies on the expertise of the personnel involved.…”

Section: Introductionmentioning

confidence: 99%

Fundamental study on estimation of tree height of Japan cedar by using visible and NIR spectra in the 400-1000 nm region of their leaves

Ishikawa

Fukuda

Ishiguro

et al. 2013

J. Agric. Meteorol.

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The objective of this study was to obtain the fundamental results for forest tree height estimation at stand level by using visible and near infra red (NIR) spectra analysis in the 400-1000 nm region and tree height data. This study was carried out at the Takakuma Experimental Forest located on the Ohsumi island of the Kagoshima prefecture. The original absorbance spectra and their second derivative spectra in the 400-1000 nm region were obtained; bands around 492, 581, and 673 nm that may be assigned to chlorophyll absorption were observed in the 400-700 nm region, and a small peak around 947 nm may be assigned to the second overtone stretching mode of the intra-molecular hydrogen-bonded OH group. The intensities of the inflection point of bands at 492 and 673 nm observed by the second derivative spectra showed a linear increase with a high correlation corresponding to the increase of tree height. The score of the first component (PC1) obtained by Principal Component Analysis (PCA) also showed a linear increase with tree height change. All of the expected absorptions were observed by the loadings of PC1. For tree height estimation, a simple linear regression, ratio regression, and Partial Least-Squares (PLS) regression using feature bands identified by second derivative were calculated. In the case of a simple linear regression using a band at 673 nm and PLS regression using a band in the 644-699 nm region, a coefficient of determination (R 2 ) of more than 0.8 and a root mean square error (RMSE) of less than 5.1 were obtained, respectively. The results obtained in the present study have demonstrated that the visible and NIR spectral characteristics, especially the chlorophyll absorption band, combined with spectral analysis are powerful tools for the estimation of tree height.

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Section: Introductionmentioning

confidence: 99%

Fundamental study on estimation of tree height of Japan cedar by using visible and NIR spectra in the 400-1000 nm region of their leaves

Ishikawa

Fukuda

Ishiguro

et al. 2013

J. Agric. Meteorol.

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Mitigation effect of urban heat island from forest canopy structure of urban forest

et al. 2015

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摘要：ヒートアイランド現象の緩和対策として，都市緑地による熱環境緩和効果が期待されている。これまでの緑化対策では樹高しか着目されておらず，樹冠構造については考慮されなかった。樹冠構造の異なる緑地を対象に, 樹冠構造の発達が地表面温度に影響するか検討した。その結果，樹冠の厚みが増すと日中の表面温度を下げ，夜間の表面温度を下げないことがわかり，昼夜間の温度変化を緩和する効果があった。そのため，樹冠構造を発達することが，都市林におけるヒートアイランド現象緩和機能を強化することがわかった。キーワード：レーザー，樹冠，垂直構造，ヒートアイランド，都市林，地上レーザー KATO, Akira, OKITSU, Yuma, TSUNEMATSU, Nobumitsu, HONJYO, Tsuyoshi, KOBAYASHI, Tatsuaki and ICHIHASHI, Arata: Mitigation effect of urban heat island from forest canopy structure of urban forest.Abstract: Urban forest is expected to mitigate heat island. Conventional study only focuses on tree height effect for the mitigation, does not count on forest canopy structure. In this study, the different forest canopy structure is compared with the surface temperature data. As a result, canopy thickness prevented from increasing daytime surface temperature and decreasing nighttime surface temperature to moderate the temperature change between day and night. Therefore, the development of forest canopy structure helps to improve the mitigation effect of heat island in urban forest.

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Extracting height and crown area of single tree in broadleaved forest by application of airborne laser scanner system

Cited by 2 publications

References 9 publications

Fundamental study on estimation of tree height of Japan cedar by using visible and NIR spectra in the 400-1000 nm region of their leaves

Fundamental study on estimation of tree height of Japan cedar by using visible and NIR spectra in the 400-1000 nm region of their leaves

Mitigation effect of urban heat island from forest canopy structure of urban forest

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