University of Canterbury Home
    • Admin
    UC Research Repository
    UC Library
    JavaScript is disabled for your browser. Some features of this site may not work without it.
    View Item 
    1. UC Home
    2. Library
    3. UC Research Repository
    4. Faculty of Engineering | Te Kaupeka Pūhanga
    5. Engineering: Reports
    6. View Item
    1. UC Home
    2.  > 
    3. Library
    4.  > 
    5. UC Research Repository
    6.  > 
    7. Faculty of Engineering | Te Kaupeka Pūhanga
    8.  > 
    9. Engineering: Reports
    10.  > 
    11. View Item

    Tree Canopy Cover in Christchurch, New Zealand 2018/19 (2022)

    Thumbnail
    View/Open
    Published version (1.202Mb)
    Type of Content
    Reports
    UC Permalink
    https://hdl.handle.net/10092/103604
    
    Publisher's DOI/URI
    http://doi.org/10.26021/m6sm-mr11
    
    Collections
    • Engineering: Reports [732]
    Authors
    morgenroth, justin cc
    show all
    Alternative Title
    2018/19 Tree Canopy Cover in Christchurch, New Zealand
    Abstract

    Tree canopy cover (TCC) is an important way of describing urban forest extent and distribution and can be used to assess the ecosystem services they provide. Tree canopy cover was mapped for Christchurch, New Zealand by Orbica Ltd. Their deep-learning approach identified and delineated tree cover from aerial imagery and LiDAR data acquired over Christchurch during 2018/19. Using this tree cover map, canopy area and cover were determined for various geographic boundary types, including wards, District Plan zones, publicly- and privately-owned land, street catchments, water body setbacks, and parks.

    The mapped tree canopy cover in Christchurch for 2018/19 was 13.56%, ranging between 6.51% in Hornby to 27.6% in Coastal. Tree cover in each of the District Plan’s zones ranges from 2.01% in Mixed Use zones to 23.24% in Open Space Zones. Tree cover on publicly-owned land comprises 42.96% of the total tree cover in Christchurch (publicly-owned land has 18.95% canopy cover), with the remaining 57.04% being on privately-owned land (privately-owned land has 11.17% canopy cover). Canopy cover within street catchments was 9.22%, within water body setbacks was 20.86%, and within parks and reserves was 25.07%.

    The tree canopy cover map has an overall accuracy of 97.8%. However, the accuracy assessment identified an omission error rate (10.2%), roughly double that of the commission error rate (5.04%) for trees. A point sample-based approach to estimating canopy cover, suggests that 2018/19 canopy cover in Christchurch is 14.7% with a 95% confidence interval of between 12.51% - 16.90%. Taken together, the relatively high omission error rate and the 14.7% canopy cover estimate from the sample-based approach, suggest that the tree cover map resulting from the deep-learning approach may have slightly underestimated tree canopy cover. Despite this, the mapped tree cover is well within the calculated 95% confidence interval, so should be viewed with certainty.

    Citation
    Morgenroth J (2022). Tree Canopy Cover in Christchurch, New Zealand 2018/19. Christchurch City Council.
    This citation is automatically generated and may be unreliable. Use as a guide only.
    Keywords
    Urban forestry; Christchurch; New Zealand; Tree cover; Canopy cover
    ANZSRC Fields of Research
    30 - Agricultural, veterinary and food sciences::3007 - Forestry sciences::300707 - Forestry management and environment
    33 - Built environment and design::3304 - Urban and regional planning::330410 - Urban analysis and development
    33 - Built environment and design::3304 - Urban and regional planning::330404 - Land use and environmental planning
    Rights
    All rights reserved unless otherwise stated
    http://hdl.handle.net/10092/17651

    Related items

    Showing items related by title, author, creator and subject.

    • Tree Canopy Cover in Christchurch, New Zealand 2018/19 

      morgenroth, justin (University of Canterbury, 2022)
      Tree canopy cover (TCC) is an important way of describing urban forest extent and distribution and can be used to assess the ecosystem services they provide. Tree canopy cover was mapped for Christchurch, New Zealand ...
    • Developing our urban forests in changing cities 

      morgenroth, justin (2021)
    • A multiscale assessment of the diversity of New Zealand’s nursery trees 

      La Sorte FA; Samaha J; morgenroth, justin (Elsevier BV, 2022)
      Nurseries play an important role providing trees for a variety of managed environments including urban forests. The diversity of urban forests and forest restoration projects are influenced by nursery species availability, ...
    Advanced Search

    Browse

    All of the RepositoryCommunities & CollectionsBy Issue DateAuthorsTitlesSubjectsThesis DisciplineThis CollectionBy Issue DateAuthorsTitlesSubjectsThesis Discipline

    Statistics

    View Usage Statistics
    • SUBMISSIONS
    • Research Outputs
    • UC Theses
    • CONTACTS
    • Send Feedback
    • +64 3 369 3853
    • ucresearchrepository@canterbury.ac.nz
    • ABOUT
    • UC Research Repository Guide
    • Copyright and Disclaimer
    • SUBMISSIONS
    • Research Outputs
    • UC Theses
    • CONTACTS
    • Send Feedback
    • +64 3 369 3853
    • ucresearchrepository@canterbury.ac.nz
    • ABOUT
    • UC Research Repository Guide
    • Copyright and Disclaimer