Open British Arboricultural Record Dataset (OpenBARD)
obard.RdOpenBARD are tree data used in the production of Fennell, Joseph. (2024). Handbook of UK Urban Tree Allometric Equations and Size Characteristics (Version 1.4). doi:10.13140/RG.2.2.28745.04961.
Format
The data frame obard has 15357 rows and 30 variables:
- record_id
Record ID
- n_stems
Number of stems
- stem_diameter_1_cm
Diameter in cm of first stem
- stem_diameter_2_cm
Diameter in cm of second stem
- stem_diameter_3_cm
Diameter in cm of third stem
- stem_diameter_4_cm
Diameter in cm of fourth stem
- stem_diameter_5_cm
Diameter in cm of fifth stem
- height_m
Height of tree in metres
- life stage
Life stage of tree
- physiological_condition
Physiological condition of tree
- classification
Nature of the location of the tree (urban, suburban, rural)
- county
County in which tree is located
- latin_name_clean
Latin (scientific) name for tree
- common_name_clean
Common name for tree
- generic_name_clean
Genus name for tree
- genus
Genus of tree
- species
Specific epithet for tree
- combined_stem_diameter_cm
Combined diameter in cm of stems
- is_multistem
Is the tree multistemmed?
- crown_radius_n_m
Radius in metre of crown on north compass point
- crown_radius_s_m
Radius in metre of crown on south compass point
- crown_radius_e_m
Radius in metre of crown on east compass point
- crown_radius_w_m
Radius in metre of crown on west compass point
- crown_radius_se_m
Radius in metre of crown on south-east compass point
- crown_radius_nw_m
Radius in metre of crown on north-west compass point
- crown_radius_ne_m
Radius in metre of crown on north-east compass point
- crown_radius_sw_m
Radius in metre of crown on south-west compass point
- crown_radius_minimum_bounding_circle
The radius of the expected minimum bounding circle of the crown
- crown_radius_maximum
The maximum radial value recorded for the tree
- data_contributor_id
Dataset-unique identifier for the data contributor
Details
The data can be found on Zenodo: https://zenodo.org/records/15593688
Estimates for the maximum sizes of amenity (and other, non-forestry) trees are important for urban planning and tree management. This report presents the findings of an applied research study to generate current best estimates for UK tree typical sizes and allometric equations. This report contains typical mature sizes for 46 species and 29 genera of trees commonly found in the UK’s towns, cities and land outside of woodland. While the data come from sites across the UK in both urban and rural areas, the data were all collected as part of professional tree surveys and so are likely to be representative of amenity trees. Trees grown in woodland conditions are not likely to be well represented by the models presented here. This report also contains allometric model formulae for up to 23 species (depending on the relationship), allowing tree characteristics such as diameter at breast height to be predicted by other measured parameters. The formulae can be used in Excel (or other software) for prediction.
What does the document contain? (1) Summary of methods used to generate the values and equations (2) Typical and large (95th percentile) crown radius, height, diameter at breast height and root protection radius for UK amenity tree species and genera (3) Plots to show these values (4) Coefficients for single-parameter allometric equations.
Examples
# Load full data set
data(obard)
# View summary
str(obard)
#> 'data.frame': 15357 obs. of 30 variables:
#> $ record_id : chr "993206fd-a580-4649-b979-45ae23eca818" "da6f26e5-890a-41a0-96a5-469dbc1ee9b4" "85be7deb-5e04-4641-bdac-8a8c7d44c153" "998e8fb8-ebc4-4959-b060-03c5a5886b87" ...
#> $ n_stems : int 1 1 2 2 1 2 2 1 1 2 ...
#> $ stem_diameter_1_cm : num 55.5 65 27 24.5 40 50 35 40 55 50 ...
#> $ stem_diameter_2_cm : num NA NA 23 24 NA 45 30 NA NA 45 ...
#> $ stem_diameter_3_cm : num NA NA NA NA NA NA NA NA NA NA ...
#> $ stem_diameter_4_cm : num NA NA NA NA NA NA NA NA NA NA ...
#> $ stem_diameter_5_cm : num NA NA NA NA NA NA NA NA NA NA ...
#> $ height_m : num 20 18 8 8 15 18 12 22 22 18 ...
#> $ life_stage : chr "semi_mature" "semi_mature" "mature" "mature" ...
#> $ physiological_condition : chr "good" "good" "good" "good" ...
#> $ classification : chr "suburban" "suburban" "suburban" "suburban" ...
#> $ county : chr "cheshire" "cheshire" "somerset" "somerset" ...
#> $ latin_name_clean : chr "tilia europaea" "aesculus hippocastanum" "magnolia macrophylla" "magnolia macrophylla" ...
#> $ common_name_clean : chr "common lime" "horse chestnut" "bigleaf magnolia" "bigleaf magnolia" ...
#> $ generic_name_clean : chr "lime" "horse chestnut" "magnolia" "magnolia" ...
#> $ genus : chr "tilia" "aesculus" "magnolia" "magnolia" ...
#> $ species : chr "europaea" "hippocastanum" "macrophylla" "macrophylla" ...
#> $ combined_stem_diameter_cm : num 55.5 65 35.5 34.3 40 67.3 46.1 40 55 67.3 ...
#> $ is_multistem : chr "False" "False" "True" "True" ...
#> $ crown_radius_n_m : num 8.5 8 4.5 4 7 7 5 7 7 7 ...
#> $ crown_radius_s_m : num 9 9 3.5 5 7 7 5 8 8 7 ...
#> $ crown_radius_e_m : num 6 6 5 5 6 6 5 7 5 5 ...
#> $ crown_radius_w_m : num 6 8 4 4.5 6 6 4 2 8 8 ...
#> $ crown_radius_se_m : num NA NA NA NA NA NA NA NA NA NA ...
#> $ crown_radius_nw_m : num NA NA NA NA NA NA NA NA NA NA ...
#> $ crown_radius_ne_m : num NA NA NA NA NA NA NA NA NA NA ...
#> $ crown_radius_sw_m : num NA NA NA NA NA NA NA NA NA NA ...
#> $ crown_radius_minimum_bounding_circle: num 8.8 8.5 4.5 4.8 7 7 5 7.5 7.5 7 ...
#> $ crown_radius_maximum : num 9 9 5 5 7 7 5 8 8 8 ...
#> $ data_contributor_id : chr "C1" "C1" "C1" "C1" ...