Stemwood Volume Estimates for a Mixed Temperate Forest using Satellite LiDAR(<Special Issue>Silvilaser)
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概要
- 論文の詳細を見る
Data from the Geoscience Laser Altimeter System (GLAS) aboard the Ice Cloud and Land Elevation Satellite (ICESat) were used to explore the potential of satellite LiDAR for the estimation of forest parameters such as vegetation height and stemwood volume. This was carried out for the Forest of Dean, Gloucestershire, UK, a semi-ancient, highly mixed, temperate forest. Previous research suggests use of Waveform Extent (the difference of alternate model fit Signal Begin and Signal End) and a Terrain Index (maximum minus minimum elevations from a 7×7 matrix, 10m resolution DTM) to provide the most robust estimate of maximum canopy height. These waveform-based maximum vegetation height estimations were used to investigate the potential of satellite LiDAR for the estimation of stemwood volume for the tallest species within each footprint. Relationships were established with predictions of stemwood volume calculated from Forestry Commission yield models. These equations succeeded in explaining 68% of variance with 88.7m^3/ha RMSE for coniferous species and R^2 of 0.65 with 68.2m^3/ha RMSE for broadleaf species. The ability of satellite LiDAR waveforms to account for stemwood volume within mixed composition stands was also investigated. Area under the waveform canopy return, maximum canopy height, dominant canopy height and height of cumulative energy percentiles were considered. The height of the 90^<th> percentile of cumulative energy was found to best represent the weighted stemwood volume of heterogeneous stands producing R^2 of 0.57, 92.3m^3/ha RMSE and R^2 of 0.59, 67.5m^3/ha RMSE for stands dominated by coniferous and broadleaf species respectively. The results of this local study indicate the potential for similar methods to be applied to regional or national scales.
- 森林計画学会の論文
著者
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Suarez Juan
The Forest Research Agency Of The Forestry Commission Great Britain Northern Research Station
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Rosette Jacqueline
Swansea University, Climate and Land-Surface Systems Interaction Centre (CLASSIC), Department of Geo
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North Peter
Swansea University, Climate and Land-Surface Systems Interaction Centre (CLASSIC), Department of Geo
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North Peter
Swansea University Climate And Land-surface Systems Interaction Centre (classic) Department Of Geogr
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Rosette Jacqueline
Swansea University Climate And Land-surface Systems Interaction Centre (classic) Department Of Geogr