From Western Australia Government
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Cocos Island Building Outlines 2013

Created 23/06/2025

Updated 21/12/2025

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Lineage: 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.

Positional Accuracy: 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.

Attribute Accuracy: 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 found to be extremely time consuming. When the methods were compared, the majority of height data only varied around 20-30cm and only the height max field was significantly improved. Image building lean may also have impacted the accuracy of the building polygons and therefore the building heights.

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Additional Info

Field Value
Title Cocos Island Building Outlines 2013
Language English
Licence Creative Commons Attribution 3.0 Australia
Landing Page https://data.gov.au/data/dataset/9159fce6-4328-4cb9-bdd7-ad7778ce8818
Remote Last Updated 04/11/2025
Contact Point
Department of Infrastructure, Transport, Cities and Regional Development
iotgis@ga.gov.au
Reference Period 03/05/2019
Geospatial Coverage
Map data © OpenStreetMap contributors
{
  "coordinates": [
    [
      [
        [
          96.49017333984375,
          -12.432714394630665
        ],
        [
          96.49017333984375,
          -11.551505538408918
        ],
        [
          97.20428466796876,
          -11.551505538408918
        ],
        [
          97.20428466796876,
          -12.432714394630665
        ],
        [
          96.49017333984375,
          -12.432714394630665
        ]
      ]
    ]
  ],
  "type": "MultiPolygon"
}
Data Portal Western Australia Government

Data Source

This dataset was originally found on Western Australia Government "Cocos Island Building Outlines 2013". Please visit the source to access the original metadata of the dataset:
https://catalogue.data.wa.gov.au/dataset/cocos-island-building-outlines-2013