Authors / CoAuthors
Unknown
Abstract
The digital elevation model (DEM) grid covers the whole of the Cocos (Keeling) Islands. It was provided by AAM in 1km by 1km tiles which were then joined together using ESRI ArcMap. Each grid cell (1m x 1m) contains the height, in metres, of the ground surface derived from the 2011 LiDAR aerial survey data.
Product Type
dataset
eCat Id
81720
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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Status
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 (photo frame and tide height table). During this period tides ranged from 0.4m to 1.3m. AAM classified the raw LiDAR points into ground and non-ground points using a single algorithm across the project area. The raw LiDAR points in the .las format were provided to Geoscience Australia along with 1km by 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 the Cocos (Keeling) Islands. 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. For a detailed description of the survey accuracy see the AAM Survey Report. The DEM grid file was generated in GDA94 and has been converted to UTM WGS 84 zone 47s to fit the rest of the Cocos GIS data. Vertical data was collected in the Cocos Keeling Island Height Datum (CKIHD).
Parent Information
Extents
[-12.24, -12.05, 96.8, 96.95]
Reference System
GDA94 (EPSG:4283)
Spatial Resolution
Service Information
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