9159fce6-4328-4cb9-bdd7-ad7778ce8818 urn:uuid en UTF-8 nonGeographicDataset nonGeographicDataset 2025-06-23T05:06:41 creation ISO 19115 2016 Cocos Island Building Outlines 2013 9159fce6-4328-4cb9-bdd7-ad7778ce8818 <strong>Lineage:</strong> 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. <strong>Positional Accuracy:</strong> 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. <strong>Attribute Accuracy:</strong> 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. <a href="https://www.infrastructure.gov.au/utilities/disclaimer.aspx">Disclaimer</a> {"type":"MultiPolygon","coordinates":[[[[96.49017333984375,-12.432714394630664],[96.49017333984375,-11.551505538408918],[97.20428466796876,-11.551505538408918],[97.20428466796876,-12.432714394630664],[96.49017333984375,-12.432714394630664]]]]} 96.49017333984375 97.20428466796876 -12.432714394630665 -11.551505538408918 Cocos Keelling Islands IOT building infrastructure Cocos Island Building Outlines 2013 documentDigital Building polygons were created in February/March 2013 by Geoscience Australia through manually digitisation of the outline of each building. Digitisation was done from scratch off the August 2011 orthophotography. SHP