Authors / CoAuthors
Abstract
The Gold Coast hydrologically enforced digital elevation model (DEM) was created from a combination of the following surveys; Redland 2009 LiDAR, Gold Coast 2009 LiDAR and Logan 2009 LiDAR survey areas. The data is licensed for use by all Commonwealth, State and Local Government. Data acquisition and post-processing for all of the input surveys has been controlled to achieve a fundamental vertical accuracy of <0.15m (RMS, 68% CI) and horizontal accuracy within 0.45 m. Horizontal coordinates are based upon Map Grid of Australia (MGA) Zone 56 projection. Vertical coordinates are referenced to Australian Height Datum (AHD). The hydrologically conditioned and drainage enforced 2m DEM or HDEM was developed in 2010 as part of the Urban DEM project managed by the CRC for Spatial Information and Geoscience Australia. The HDEM was produced by SKM using the ANUDEM program. The HDEM ensures that primary stream/channel flow, and water flow across the land surface are accurately represented. The hydrologically enforced elevation model should be used for hydrological modelling.
Product Type
dataset
eCat Id
70823
Contact for the resource
Custodian
Owner
Custodian
Cnr Jerrabomberra Ave and Hindmarsh Dr GPO Box 378
Canberra
ACT
2601
Australia
Keywords
-
- DEM topographic
- ( Theme )
-
- DEM
-
- AU-QLD
- Australian and New Zealand Standard Research Classification (ANZSRC)
-
- Topology
-
- Published_Internal
Publication Date
2009-01-01T00:00:00
Creation Date
Security Constraints
Legal Constraints
Special, MOU, etc.
Access - restricted
Use - license
Status
Purpose
Maintenance Information
unknown
Topic Category
elevation
Series Information
Lineage
Airborne Laser Scanning (ALS) data was acquired for the South East Queensland (SEQ) Priority Area from a fixed wing aircraft during twenty six flights between March 25th and June 9th 2009. Acquisition over tidal areas was undertaken within +/- 2 hours of low tide. Delays in acquiring the data were caused by prolonged periods of rain over the project area during March to April, 2009. Ground Support: GPS base station support was provided by SunPOZ GNSS receiver network without incident. Ground check points acquired by AAMHatch allowed an assessment of the accuracy of the ALS data and final adjustment to AHD. Data Processing: Reduction of the ALS data proceeded without any significant problems. Laser strikes were classified into ground and non-ground points using a single algorithm across the project area. Manual checking and editing of the data classification further improved the quality of the terrain model. Further Processing: Contours: Contours have been generated automatically from a smoothed triangulated ground model and visually checked for completeness and logical consistency. Some cartographic license has been applied in areas where laser points were not captured. Gaps in the ground point data from which the contours are derived exist at locations within the Gold Coast area and at Burpengary. Data for these areas were re-captured and supplied in a subsequent volume. Products: The point density of the acquired data (>2pts/sqm) places limitations on the size of tiles into which the data can be divided and subsequently managed. The data in this volume is delivered in 1 km tiles to maintain manageable file sizes and point counts. NEDF Metadata Acquisition Start Date: Wednesday, 25 March 2009 Acquisition End Date: Tuesday, 9 June 2009 Sensor: LiDAR Device Name: Leica ALS50-II (S/N: 091) Flying Height (AGL): 1700 INS/IMU Used: Unknown Number of Runs: UNK Number of Cross Runs: UNK Swath Width: 850 Flight Direction: UNK Swath (side) Overlap: 25 Horizontal Datum: GDA94 Vertical Datum: AHD71 - using local Geoid model Map Projection: MGA56 Description of Aerotriangulation Process Used: - Description of Rectification Process Used: - Spatial Accuracy Horizontal: 0.45 Spatial Accuracy Vertical: 0.15 Average Point Spacing (per/sqm): 2.5 Laser Return Types: 4 pulses (1st 2nd 3rd 4th and intensity) Data Thinning: Ground, Non Ground & Building Laser Footprint Size: 0.34 Calibration certification (Manufacturer/Cert. Company): AAM Hatch Limitations of the Data: The definition of the ground under trees may be less accurate. Building classification is derived from automatic classification only. Surface Type: HDEM Product Type: GRID Classification Type: C2 Grid Resolution: 2 Distribution Format: ESRI GRID Processing/Derivation Lineage: AAM Hatch WMS: http://nedf.ga.gov.au:8399/arcgis/services/GoldCoast_2009_HDEM/MapServer/WMSServer?
Parent Information
Extents
[-28.0, -26.0, 152.0, 154.0]
Reference System
Spatial Resolution
Service Information
Associations
Downloads and Links
Source Information
Gold Coast Hydrologic 2009