This dataset is collated from arboriculturists in the UK and predominantly contains records from England, with some data from Wales, Scotland and Jersey. Each record in the dataset is an individual tree that has been assessed in the field. Different organisations contributed data to the dataset, so not all data is available for every record. The dataset has been cleaned to aid analysis (details in this report) but users are advised to exercise caution, particularly for the common_name_clean and generic_name_clean fields. The dataset was prepared and released by Dr Joe Fennell (https://www.jfscientific.co.uk) and Mr Luke Fay (https://www.treeworks.co.uk/) Reporting Issues and Feature Requests We welcome community feedback for improving future releases. Please submit issues and feature requests through the anonymous Google Form here: Link to Google Form (opens in new window). Field names and descriptions. Column Name Description Data Type Units Options Example Value record_id UUID for this specific record String n_stems Number of stems Integer count 2 stem_diameter_1_cm Diameter (DBH) of first stem Float centimetre 34 stem_diameter_2_cm Diameter (DBH) of second stem Float centimetre 28.5 stem_diameter_3_cm Diameter (DBH) of third stem Float centimetre stem_diameter_4_cm Diameter (DBH) of fourth stem Float centimetre stem_diameter_5_cm Diameter (DBH) of fifth stem Float centimetre height_m Height of tree Float metre 17 life_stage Tree life stage String young; semi_mature; mature; late_mature; ancient; dead mature physiological_condition Tree health condition String good; fair; poor; dead good classification Environment/site classification String suburban; urban; rural urban county County or administrative region String somerset latin_name_clean Latin species name String quercus robur common_name_clean Common name (NOTE: treat with caution) String english oak generic_name_clean Generic name (NOTE: treat with caution) String oak genus Genus of the tree String quercus species Species (epithet) String robur combined_stem_diameter_cm Combined stem diameter (basal area equivalent diameter) Float centimetre 44.4 is_multistem Whether the tree has multiple stems Bool True; False TRUE crown_radius_n_m Crown radius to the north Float metre 2.1 crown_radius_s_m Crown radius to the south Float metre 2.3 crown_radius_e_m Crown radius to the east Float metre 1.9 crown_radius_w_m Crown radius to the west Float metre 2.5 crown_radius_se_m Crown radius to the southeast Float metre crown_radius_nw_m Crown radius to the northwest Float metre crown_radius_ne_m Crown radius to the northeast Float metre crown_radius_sw_m Crown radius to the southwest Float metre crown_radius_minimum_bounding_circle Radius of the minimum bounding circle Float metre 2.2 crown_radius_maximum Maximum crown radius across all directions Float metre 2.5 data_contributor_id Identifier for data contributor String C7 Data Contributors The following organisations contributed data that was used during the project: Treework Environmental Practice, Arbor-eco consultancy, Bartlett Tree Experts, Barton Hyett Associates, Oxfordshire County Council, Sharon Hosegood Associates, TMA Environmental Consultants, Tree Frontiers and Wharton Natural Infrastructure (Please note that not all data initially supplied is contained in the final dataset). Acknowledgements The authors are very grateful to the following people for their contributions to the previous stages of this project: Carl Walters (Open University), Natalie Cook (Treework Environmental Practice), Supritha Hudgur (Treework Environmental Practice), Magda Mach (Treework Environmental Practice), Sharon Durdant-Hollamby (Sharon Hosegood Associates), Madalena Vaz Monteiro (Forest Research), Hannah Walker (Forest Research), Kieron Doick (Forest Research), Kadmiel Maseyk (Open University) and Phil Wheeler (Open University). The previous phase of this project received financial support from The Open University’s “Open Societal Challenges”Programme under a grant awarded to Dr Kadmiel Maseyk, Dr Phil Wheeler and Dr Joe Fennell.