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        wa.gov.au WALIS Capture WA Land Monitor
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      4. Christmas Island Building Outlines 2011

      Christmas Island Building Outlines 2011

      Building polygons were created in February 2013 by Geoscience Australia by manually digitising the outline of each building off the 2011 orthophotography.

      Digitisation was done from scratch off the 2011 orthophotography within Quantum GIS. Using the ArcMap 'zonal statistics' tool the minimum, mean and maximum heights were found for each building polygon from the 2011 digital elevation model and the 2011 digital surface model (DSM). This information was then joined to the building polygon attribute table. To find the building height from ground to roof, the difference between the Mean DSM and mean DEM was calculated and added as a field to the attribute table. To find the maximum height of each building the difference between the Maximum DSM and Mean DEM was calculated. Polygon area, perimeter, and x and y coordinates of each building were also attached as attributes.

      Accuracy is high as the layer was based on the 2011 orthophotography. Error may have been introduced through the digitisation process. Building lean in the orthophotography may also contribute to polygons which are slightly inaccurately placed.

      Height attribute accuracy is inaccurate for building polygons which have tree cover above them, as the tree elevation would influence the digital surface model. Particularly the Max_height field may include tree heights rather than building heights in some cases. Attribute accuracy could be improved by using the raw 2011 lidar data (.las files) which are classified at 'buildings' to attach heights. This method was tested and was extremely time consuming - only the height_max field was significantly improved.

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      License
      Creative Commons Attribution 4.0

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      Tags
      • Christmas
      • IOT
      • building
      • topographic
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      • australian-indian-ocean-territories-christmas-island

        Australian Indian Ocean Territories - Christmas Island

        The Australian Government, through the Department of Infrastructure, Regional...

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      Activity Stream RDF JSON
      department-of-infrastructure-and-regional-development
      Key Information
      Published by
      Department of Infrastructure, Transport, Cities and Regional Development
      Information classification
      -
      Data theme
      Civic Infrastructure
      Data last updated
      11-06-2011
      Update frequency
      one-off snapshot
      Data custodian
      Geoscience Australia
      Dataset contact
      Maintainer Not Specified
      Website
      -
      First published
      11-06-2011
      Metadata last updated
      25-05-2022
      Data source
      -
      Temporal coverage
      -
      Geospatial theme
      Buildings and Structures
      Geospatial source projection
      UTM WGS84 48s
      Spatial coverage

      Dataset extent

      Base map and data from OpenStreetMap and OpenStreetMap Foundation
      Digital object identifier
      -
      Citation
      -
      Data usability rating How reusable and linked the data is. Learn more.

      Acknowledgement

      The Government of Western Australia respectfully acknowledges the traditional owners of country throughout Western Australia and pays its respects to Elders past, present and emerging.

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