26 research outputs found
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Dendrometry Field Manual
As it was conceptualized, the manual is aligned with other field manual that are currently in use by different universities, such as Mississippi State University, Stephen F Austin, or University of British Columbia. The present manual is the first unified version of Louisiana Tech University of a Field Manual to be used in conjunction with the Forest Measurements course.
The manual covers both forest inventory techniques that are traditionally used in cruising, such as preset intensity inventory, as well as modern techniques, such as distance sampling. The manual is dedicated to layout in great details all the steps required for successful completion of a forest inventory. To each technique a special section is dedicated to the possible usage of the respective technique, such as distance sampling can be used in forest inventory, fuel load or forest planning.
A series of visual aids were used to enhance the presentation. The images, drawings, or chart presented are either produced by the author or courtesy of the US Forest Service, which states that “Photographs and images on this website (i.e., http://www.fs.fed.us/) are publicly owned, produced by Forest Service employees or other government agencies and institutions; or, have been obtained from non-governmental organizations and private photographers with their permission to use them on this website. Photographs included on this website that are publicly owned are available for free for non-commercial scientific and educational uses.” In text the graphical aids obtained from the US Forest Service website were identified in the caption
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Tree2_field.txt
The dataset contains three loblolly pines (Pinus taeda Lindl.) stems reconstructed with terrestrial photogrammetric techniques. The trees were growing in west-central Louisiana, Vernon parish. The reconstructed models reached over 50% of the relative height, the proportion of the stem, on which the majority of the merchantable volume is located. After capturing the images needed for the 3D photogrammetric rendering , we cut the trees and measured their diameters every meter along the stem starting at 1 m above the ground. The files describing the three trees provide a calibrated dataset that can be used for development of taper models, testing and calibration of segmentation algorithms, or identifications of products that can be obtained from a stem
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Tree3_PPC.las
The dataset contains three loblolly pines (Pinus taeda Lindl.) stems reconstructed with terrestrial photogrammetric techniques. The trees were growing in west-central Louisiana, Vernon parish. The reconstructed models reached over 50% of the relative height, the proportion of the stem, on which the majority of the merchantable volume is located. After capturing the images needed for the 3D photogrammetric rendering , we cut the trees and measured their diameters every meter along the stem starting at 1 m above the ground. The files describing the three trees provide a calibrated dataset that can be used for development of taper models, testing and calibration of segmentation algorithms, or identifications of products that can be obtained from a stem
Recommended from our members
Tree1_PPC.las
The dataset contains three loblolly pines (Pinus taeda Lindl.) stems reconstructed with terrestrial photogrammetric techniques. The trees were growing in west-central Louisiana, Vernon parish. The reconstructed models reached over 50% of the relative height, the proportion of the stem, on which the majority of the merchantable volume is located. After capturing the images needed for the 3D photogrammetric rendering , we cut the trees and measured their diameters every meter along the stem starting at 1 m above the ground. The files describing the three trees provide a calibrated dataset that can be used for development of taper models, testing and calibration of segmentation algorithms, or identifications of products that can be obtained from a stem
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Tree3_mesh.dxf
The dataset contains three loblolly pines (Pinus taeda Lindl.) stems reconstructed with terrestrial photogrammetric techniques. The trees were growing in west-central Louisiana, Vernon parish. The reconstructed models reached over 50% of the relative height, the proportion of the stem, on which the majority of the merchantable volume is located. After capturing the images needed for the 3D photogrammetric rendering , we cut the trees and measured their diameters every meter along the stem starting at 1 m above the ground. The files describing the three trees provide a calibrated dataset that can be used for development of taper models, testing and calibration of segmentation algorithms, or identifications of products that can be obtained from a stem
Recommended from our members
Tree3_field.txt
The dataset contains three loblolly pines (Pinus taeda Lindl.) stems reconstructed with terrestrial photogrammetric techniques. The trees were growing in west-central Louisiana, Vernon parish. The reconstructed models reached over 50% of the relative height, the proportion of the stem, on which the majority of the merchantable volume is located. After capturing the images needed for the 3D photogrammetric rendering , we cut the trees and measured their diameters every meter along the stem starting at 1 m above the ground. The files describing the three trees provide a calibrated dataset that can be used for development of taper models, testing and calibration of segmentation algorithms, or identifications of products that can be obtained from a stem
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README_PPC_3Dtrees.txt
The dataset contains three loblolly pines (Pinus taeda Lindl.) stems reconstructed with terrestrial photogrammetric techniques. The trees were growing in west-central Louisiana, Vernon parish. The reconstructed models reached over 50% of the relative height, the proportion of the stem, on which the majority of the merchantable volume is located. After capturing the images needed for the 3D photogrammetric rendering , we cut the trees and measured their diameters every meter along the stem starting at 1 m above the ground. The files describing the three trees provide a calibrated dataset that can be used for development of taper models, testing and calibration of segmentation algorithms, or identifications of products that can be obtained from a stem
Recommended from our members
Tree2_PPC.las
The dataset contains three loblolly pines (Pinus taeda Lindl.) stems reconstructed with terrestrial photogrammetric techniques. The trees were growing in west-central Louisiana, Vernon parish. The reconstructed models reached over 50% of the relative height, the proportion of the stem, on which the majority of the merchantable volume is located. After capturing the images needed for the 3D photogrammetric rendering , we cut the trees and measured their diameters every meter along the stem starting at 1 m above the ground. The files describing the three trees provide a calibrated dataset that can be used for development of taper models, testing and calibration of segmentation algorithms, or identifications of products that can be obtained from a stem
Recommended from our members
Tree1_field.txt
The dataset contains three loblolly pines (Pinus taeda Lindl.) stems reconstructed with terrestrial photogrammetric techniques. The trees were growing in west-central Louisiana, Vernon parish. The reconstructed models reached over 50% of the relative height, the proportion of the stem, on which the majority of the merchantable volume is located. After capturing the images needed for the 3D photogrammetric rendering , we cut the trees and measured their diameters every meter along the stem starting at 1 m above the ground. The files describing the three trees provide a calibrated dataset that can be used for development of taper models, testing and calibration of segmentation algorithms, or identifications of products that can be obtained from a stem
Comparison of stem volume estimates from terrestrial point clouds for mature Douglas-fir (Pseudotsuga menziessi (Mirb.) Franco)
As a complement to traditional estimates of stem dimensions from numerical models, terrestrial light detection and ranging (Lidar) provides direct stem diameter and volume values using cylindrical models constructed from point clouds. This study used two approaches to estimate total stem volume using Lidar and compared them with two empirical equations, one used by the Forest Inventory Analysis in the Pacific Northwest (FIA-PNW) and one based on a taper equation. We fitted point clouds of 10 Douglas-fir with three sets of cylinder models that are distinguished by their segment length (i.e. 0.5 m, 1 m, and 2 m), then developed three taper equations based on the point-cloud-based diameter estimated previously. We estimated the total stem volume of the tree with eight models: six-point cloud-based (i.e. three taper and three cylinders) and two empirical. Finally, we used simulations to extrapolate the volume estimations of various methods for different diameters at breast height (DBH) classes. We found that all the point-cloud-based taper equations were similar in their performance (R2=0.94, RMSE = 4.6 cm) and produced mean volume estimates greater than mean estimates of the existing models. The cylinder models produced 11–16% greater mean volume estimates than the FIA-PNW estimate, with the 0.5 m segment length producing the greatest values, followed by the 1 m and 2 m segment length. The simulated data suggested that the mean volume estimates of a given DBH class are different when using different computation methods. ANOVA revealed a combined effect of the computation methods and the DBH class on the mean volume estimates. We conclude that the point-cloud-based taper equations, after being symmetrically calibrated, would be consistent with the regional stem volume estimates, whereas the cylinder models would be better in estimating individual stem volume. When constructing Lidar-based cylinder models in future applications, cylinder segment length would need to be adjusted to the length and DBH of the stem, as well as to the objectives of the research