Authors / CoAuthors
Unknown
Abstract
AAM Hatch was engaged by Geoscience Australia to undertake a LiDAR survey over the BHMAR Phase 2 prject area, for the purpose of producing a DTM and vegetation structure analysis. The survey covers an area of approximately 7856 sqkm of the Lower Darling River, downstream from Wilcannia. LiDAR was acquired from a fixed wing aircraft between 19 June 2009 and 5 August 2009 with a vertical accuracy of 0.15m and horizontal accuracy of 0.25m in coordinated system GDA 94, MGA Zone 54 and vertical datum of AHD. File formats included las format and 1m DTM ESRI Grids in ArcGIS binary grid format. Producing a DTM and vegetation structure analysis for the BHMAR Phase 2 Project area for groundwater monitoring.
Product Type
dataset
eCat Id
70592
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
- ( Theme )
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- DEM
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- AU-NSW
- Australian and New Zealand Standard Research Classification (ANZSRC)
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- Topology
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- Published_Internal
Publication Date
2010-01-01T00:00:00
Creation Date
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Status
Purpose
Maintenance Information
unknown
Topic Category
elevation
Series Information
Lineage
Ground support: GPS base station support was provided by Geomatix without incident. The ground check points acquired by Geomatix allowed an assessment of the accuracy of the ALS data. Data processing: Reduction of the ALS data proceeded without any significant problems. Laser stirkes were classified into ground and non-ground points using a sinlge algorithm across the project area. Manual checking and editing of the data classsification further improved the quality of the terrain model. Large water bodies have been classified as water. Further automated filtering classified the non-ground points into buildings, low vegetation, medium vegetation and high vegetation. Further processing: ArcGIS 9.2 Terrains were created from ground classified LiDAR data. One metre ESRI ArcGIS bindary grids were derived using customised ArcGIS macro. Further issues: The data in this survey has been adjusted to a local geoid model produced by interpolation of local benchmarks in the project area. Differences between AusGeoid98 and local AHD were surveyed at 33 benchmarks in the project area. From these differences a correction model was constructed using the following strategy: model to be smooth with no sudden sharp changes; model to honour all the measured difference within a few centimtres and use the trends from measured data to extrapolate to the boundary of the area in SW and NE corners. AAM Hatch believe the correction model is valid for the accuracy specification for the project. NEDF Metadata Acquisition Start Date: 19/06/2009 Acquisition End Date: 5/08/2009 Sensor: LiDAR Device Name: Leica ALS50-II (S/N: 091) Flying Height (AGL): 1800 INS/IMU Used: Honeywell URIS (S/N: 56016277) Number of Runs: 208 Number of Cross Runs: 6 Swath Width: 1032 Flight Direction: Various Swath (side) Overlap: 10 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: 0.25 Spatial Accuracy Vertical: 0.15 Average Point Spacing (per/sqm): 2 Grid Resolution: 1 Laser Return Types: 4 pulses (1st 2nd 3rd 4th and intensity) Data Thinning: - Laser Footprint Size: 0 Surface Type: CFM Product Type: GRID Distribution Format: ESRI GRID Calibration certification (Manufacturer/Cert. Company): AAM Hatch (Leica Geosystems AG) Limitations of the Data: Lakes and water bodies. Processing/Derivation Lineage: AAM Hatch WMS: http://WIN-UDEM2:8399/arcgis/services/Lower_Darling_2009/MapServer/WMSServer?
Parent Information
Extents
[-33.2, -31.7, 141.9, 143.3]
Reference System
Spatial Resolution
Service Information
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