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      4. Christmas Island Digital Elevation Model - 2011

      Christmas Island Digital Elevation Model - 2011

      In 2011 AAM was commissioned by the Commonwealth to fly an airborne laser scanning survey (LiDAR) of Christmas Island. The survey was carried out using a fixed wing aircraft between the 24th and 26th of August 2011. All data was captured within approximately 2 hours of low tide. During this period tides ranged from 0.5m to 1.2m.

      AAM classified the raw LiDAR points into the following classes using a single algorithm across the project area: 0 Unclassified - Created, never classified 1 Default - Unclassified 2 Ground - Bare ground 3 Low vegetation - 0 – 0.3m (essentially sensor 'noise') 4 Medium vegetation - 0.3 – 2m 5 High vegetation - 2m > 6 Buildings, structures - Buildings, houses, sheds, silos etc. 7 Low / high points - Spurious high/low point returns (unusable) 8 Model key points - Reserved for ‘model key points’ only 9 Water - Any point in water 10 Bridge - Any bridge or overpass 11 not used - Reserved for future definition 12 Overlap points - Flight line overlap points

      The raw LiDAR points in the .las format were provided to Geoscience Australia along with 1km ESRI grid tiles generated by interpolation from the points. The tiles were then joined to create a DEM (TIFF) that covers the full extent of Christmas Island. Each cell, 1m x 1m, in the grid contains the height in metres of the ground surface. As a guide, the DEM data is vertically accurate to 15cm and horizontally accurate to 30cm. Manual checking and editing was carried out by AAM to improve accuracy. Positional accuracy has been checked by Geoscience Australia and was found to match the ground surface well.

      The DEM data is complete for the full extent of Christmas Island.

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      • open Christmas Island Digital Elevation Model - 2011 tif

        The 2011 digital elevation model (DEM) grid...

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      Tags
      • Christmas
      • DEM
      • IOT
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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...

        View Australian Indian Ocean Territories - Christmas Island
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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
      Governance
      Data last updated
      21-06-2019
      Update frequency
      one-off snapshot
      Data custodian
      Geoscience Australia
      Dataset contact
      IOTA Operations
      Website
      -
      First published
      -
      Metadata last updated
      25-05-2022
      Data source
      -
      Temporal coverage
      -
      Geospatial theme
      Terrain
      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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