Authors / CoAuthors
Unknown
Abstract
The CHM grid covers the whole of the Cocos (Keeling) Islands. It was provided by AAM Pty Ltd in 1km tiles which were then joined together using ESRI ArcMap. Each grid cell (2m x 2m) contains the maximum vegetation height in metres derived from the 2011 LiDAR aerial survey data.
Product Type
dataset
eCat Id
81715
Contact for the resource
Custodian
Point of contact
Cnr Jerrabomberra Ave and Hindmarsh Dr GPO Box 378
Canberra
ACT
2601
Australia
Keywords
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- DEM topographic
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- AU-ACT
- Australian and New Zealand Standard Research Classification (ANZSRC)
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- Earth Sciences
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- Published_Internal
Publication Date
2012-01-01T00:00:00
Creation Date
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Purpose
Maintenance Information
asNeeded
Topic Category
geoscientificInformation
Series Information
Lineage
In 2011 AAM was commissioned by the Commonwealth to fly an airborne laser scanning survey of Cocos (Keeling) Islands. The survey was carried out using a fixed wing aircraft between the 8th and 16th of August 2011. All data was captured within approximately 2 hours of low tide (link to tide xls in height_data/source). During this period tides ranged from 0.4m to 1.3m. AAM classified the raw LiDAR points 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 Canopy height was generated by subtracting the ground height from the first laser return classified as vegetation. A canopy height model (CHM) was provided to Geoscience Australia as 2km by 2km ESRI grid tiles. These tiles were then joined to create a CHM (TIFF) that covers the full extent of the Cocos (Keeling) Islands. Each grid cell, 2m by 2m, contains the height in metres of the vegetation canopy. As a guide, the data is vertically accurate to 15cm and horizontally accurate to 30cm. For a detailed description of the survey accuracy see the AAM Survey Report. The canopy height model grid file was generated in GDA94 MGA zone 47 and has been left in this projection.
Parent Information
Extents
[-12.24, -12.05, 96.8, 96.95]
Reference System
Spatial Resolution
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