Main Experiment: Tree laser scanning data Site A March 2012

Usage Rights

This data is Free for members.

Dataset Abstract

Terrestrial laser scanning (TLS) provides a valuable tool for the retrieval of detailed individual-tree structural parameters. In March 2012, we scanned 438 young trees (under leaf-off condition) across 14 plots in Site A. The scans were performed with a FARO Laser Scanner Photon 120/20 (FARO Technologies, Inc., FLorida, USA). The co-registration of the point clouds from nine scans within each plot was carried out with FARO Scene (V.5.0.1) in order to yield a complete 3D representation for each plot. The Pointools Edit (V.1.5) was used to retrieve the total tree height, stem diameter at ground height, the length of the longest branch and the height of the longest branch.

Dataset Design

The tree positions in the so called extended core area for each 1mu-plot were scanned. The extended core area is the central 6 * 6 tree positions in the monocultres and 2-species mixtures (36 tree positions per 1mu-plot) and the central 12 * 12 tree positions in the 4-, 8-, 16- or 24- species mixtures (144 tree positions per 1mu-plot).

Spatial Extent

This data was collected from plot H25, H26, K18, L23, M27, N13, N14, N27, N28, O17, P23, R17, S18, T17 in site A within the BEF-China experiment.

Taxonomic Extent

The central 36 tree individuals in each plot. Total 14 plots in Site A (H25, H26, K18, L23, M27, N13, N14, N27, N28, O17, P23, R17, S18, T17) were registered, segmented and parameter retrieved.

Measurement Circumstances

The measurements were during March when after weeding and deciduous trees are under leaf-off condition, in order to minimize the occlusion from deciduous tree foliage and from understory vegetation.

Data Analysis

Data can be used to estimate coverage, biomass, and tree structure

Data columns available in the raw data part of this dataset

TAG
code for planting locations, 12 digits with "t" in front; Datagroup description: Tree or shrub tags consist of 12 digits: The first 6 are the site plot name: _1_ site _2/3_ row, counting from North _4/5_ column, counting from west _6_ is the plot moved? Is it a quarter plot? The next 6 digits describe the tree individual _7/8_ type of individual (01 planned tree, 02 other tree than planted but in a given plot somewhere, 03 planned shrub, 04 other shrub within this plot) _9/10_ x grid position within plot, starting from southwest northwards _11/12 y grid position, starting from southwest eastwards.
Data group: t or s TAG Main Experiment
Keywords: tree individual, location, object
Values
t108250010711
t108250010710
t108250010707
t108250010709
t108250010708
PLOT_NO
plot
Data group: Helper
Keywords: Site A, plot
Values
M27
H26
H25
L23
K18
height_pt
tree height measured with Pointools; Datagroup description: Total height was determined by averaging two measurements of the lengths from the point representing stem base to the endpoint of the highest crown.; Instrumentation: FARO Laser Scanner Photon 120/20, FARO Scene, Pointools
Unit: centimeter
Data group: Plant height
Keywords: tree height, Laser Scanning
Values
104
102
101
100
106
* Hess, C. also contributed to this column.
gd_pt
stem diameter at ground height measured with Pointools; Datagroup description: GD was determined by averaging the maximum and the minimum diameters of the cross section at 5 cm aboveground (white mark); Instrumentation: FARO Laser Scanner Photon 120/20, FARO Scene, Pointools
Unit: centimeter
Data group: Basal diameter
Keywords: Stem diameter, Laser Scanning
Values
0.8
1
0.9
0.7
1.1
* Hess, C. also contributed to this column.
gd_pt_q
the point cloud quality of cross-section
Data group: Quality classes of point cloud
Values
1
2
0
* Hess, C. also contributed to this column.
llong_pt
the length of the longest branch measured with Pointools
Unit: centimeter
Data group: Branch demography
Keywords: branch, Laser Scanning
Values
100
10
103
102
101
* Hess, C. also contributed to this column.
hlong_pt
the height of the longest branch measured with Pointools; Datagroup description: The length between the stem base and the branch collar was measured as the height of the longest branch.; Instrumentation: FARO Laser Scanner Photon 120/20, FARO Scene, Pointools
Unit: centimeter
Data group: Branch demography
Keywords: branch, Laser Scanning
Values
0
100
101
1
10
* Hess, C. also contributed to this column.