Evaluating the reliability of bi-temporal canopy height model generated from airborne laser scanning for monitoring forest growth in boreal forest region

The discrepancies in data across different phases and the unexplored optimal spatial resolution present challenges when using multi-temporal canopy height models to accurately discern actual forest growth. In this study, we evaluated the reliability of bi-temporal CHMs to characterize growth changes...

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Published inInternational journal of digital earth Vol. 17; no. 1
Main Authors Yu, Zhexiu, Qi, Jianbo, Zhao, Xun, Huang, Huaguo
Format Journal Article
LanguageEnglish
Published Taylor & Francis 31.12.2024
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Abstract The discrepancies in data across different phases and the unexplored optimal spatial resolution present challenges when using multi-temporal canopy height models to accurately discern actual forest growth. In this study, we evaluated the reliability of bi-temporal CHMs to characterize growth changes in a boreal natural forest over a four-year period. A maximum mosaic method was introduced to construct a CHM from various flight strips, aimed at minimizing data alignment errors. Subsequently, the canopy height and height changed derived from six different height percentile metrics and five spatial resolutions were evaluated. The results showed that higher resolution (e.g., < 2 m) and lower height metrics (e.g., 85th height percentile) consistently underestimated. Tree growth correlation with individual segmentation surpassed field-measurements at all resolutions and height metrics. for the optimal resolution and height metrics, the results suggest that using a 95th height percentile the 10 m scale effectively represents both canopy height ( $R_{2012}^2$ R 2012 2  = 0.95, $RMSE_{2012}$ RMS E 2012  = 0.88 m, $rRMSE_{2012}$ rRMS E 2012  = 5.83%; $R_{2016}^2$ R 2016 2  = 0.96, $RMSE_{2016}$ RMS E 2016  = 1.11 m, $rRMSE_{2016}$ rRMS E 2016  = 6.91%) and height changes ( $R^2$ R 2  = 0.59, $RMSE$ RMSE  = 0.86 m, $rRMSE$ rRMSE  = 18.38%). This study demonstrates the necessity of carefully evaluating data characteristics and resolutions when employing multi-temporal CHM for forest dynamics monitoring.
AbstractList The discrepancies in data across different phases and the unexplored optimal spatial resolution present challenges when using multi-temporal canopy height models to accurately discern actual forest growth. In this study, we evaluated the reliability of bi-temporal CHMs to characterize growth changes in a boreal natural forest over a four-year period. A maximum mosaic method was introduced to construct a CHM from various flight strips, aimed at minimizing data alignment errors. Subsequently, the canopy height and height changed derived from six different height percentile metrics and five spatial resolutions were evaluated. The results showed that higher resolution (e.g., < 2 m) and lower height metrics (e.g., 85th height percentile) consistently underestimated. Tree growth correlation with individual segmentation surpassed field-measurements at all resolutions and height metrics. for the optimal resolution and height metrics, the results suggest that using a 95th height percentile the 10 m scale effectively represents both canopy height ( $R_{2012}^2$ R 2012 2  = 0.95, $RMSE_{2012}$ RMS E 2012  = 0.88 m, $rRMSE_{2012}$ rRMS E 2012  = 5.83%; $R_{2016}^2$ R 2016 2  = 0.96, $RMSE_{2016}$ RMS E 2016  = 1.11 m, $rRMSE_{2016}$ rRMS E 2016  = 6.91%) and height changes ( $R^2$ R 2  = 0.59, $RMSE$ RMSE  = 0.86 m, $rRMSE$ rRMSE  = 18.38%). This study demonstrates the necessity of carefully evaluating data characteristics and resolutions when employing multi-temporal CHM for forest dynamics monitoring.
ABSTRACTThe discrepancies in data across different phases and the unexplored optimal spatial resolution present challenges when using multi-temporal canopy height models to accurately discern actual forest growth. In this study, we evaluated the reliability of bi-temporal CHMs to characterize growth changes in a boreal natural forest over a four-year period. A maximum mosaic method was introduced to construct a CHM from various flight strips, aimed at minimizing data alignment errors. Subsequently, the canopy height and height changed derived from six different height percentile metrics and five spatial resolutions were evaluated. The results showed that higher resolution (e.g., < 2 m) and lower height metrics (e.g., 85th height percentile) consistently underestimated. Tree growth correlation with individual segmentation surpassed field-measurements at all resolutions and height metrics. for the optimal resolution and height metrics, the results suggest that using a 95th height percentile the 10 m scale effectively represents both canopy height ([Formula: see text] = 0.95, [Formula: see text] = 0.88 m, [Formula: see text] = 5.83%; [Formula: see text] = 0.96, [Formula: see text] = 1.11 m, [Formula: see text] = 6.91%) and height changes ([Formula: see text] = 0.59, [Formula: see text] = 0.86 m, [Formula: see text] = 18.38%). This study demonstrates the necessity of carefully evaluating data characteristics and resolutions when employing multi-temporal CHM for forest dynamics monitoring.
Author Qi, Jianbo
Huang, Huaguo
Yu, Zhexiu
Zhao, Xun
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Snippet The discrepancies in data across different phases and the unexplored optimal spatial resolution present challenges when using multi-temporal canopy height...
ABSTRACTThe discrepancies in data across different phases and the unexplored optimal spatial resolution present challenges when using multi-temporal canopy...
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SubjectTerms canopy height model
forest canopy height change
Multi-temporal
spatial scale
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Title Evaluating the reliability of bi-temporal canopy height model generated from airborne laser scanning for monitoring forest growth in boreal forest region
URI https://www.tandfonline.com/doi/abs/10.1080/17538947.2024.2345725
https://doaj.org/article/bec76a7aed254301a5eae7db25b58b62
Volume 17
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