Authors / CoAuthors
Abstract
AAMHatch has been engaged by Geoscience Australia to undertake a LiDAR survey over the BHMAR Phase 2 project 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. To this end, LiDAR data was acquired from a fixed wing aircraft between June 19th and August 5th 2009.
Product Type
dataset
eCat Id
89761
Contact for the resource
Custodian
Owner
Custodian
Cnr Jerrabomberra Ave and Hindmarsh Dr GPO Box 378
Canberra
ACT
2601
Australia
Keywords
- Australian and New Zealand Standard Research Classification (ANZSRC)
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- Earth Sciences
- ( {1} )
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- HVC_144648
- ( {1} )
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- Airborne Digital Data
- ( {1} )
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- NSW
- ( {1} )
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- Published_Internal
Publication Date
2015-01-01T00:00:00
Creation Date
Security Constraints
Legal Constraints
Status
Purpose
Maintenance Information
asNeeded
Topic Category
elevation
Series Information
Lineage
Acquisition: Airborne Laser Scanning (ALS) data was acquired from a fixed wing aircraft between June 19th and August 5th 2009. 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 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. 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. Data Presentation: The data provided on this volume has been supplied in accordance with a specification agreed with the primary client. Subsequent users experiencing difficulties in handling the data should please contact AAMHatch to arrange a more appropriate data presentation. 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. The following report describes the model. AG98 to AHD Correction Model 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 differences within a few centimetres - use the trends from measured data to extrapolate to the boundary of the area in SW and NE corners We believe the correction model is valid for the accuracy specification for the project. METADATA ELEMENTS Characteristic Description Device Name Leica ALS50-II S/N 091 IMU Used Honeywell UIRS S/N 56016277 Acquisition Start Date 19/06/2009 Acquisition End Date 05/08/2009 Number of Runs 208 Number of Cross Runs 6 Flight Direction Various Directions Flying Height (AGL) 1800m Half Scan Angle 16 degrees Swath Width 1032m Sidelap 10% Average Point Spacing 2pts/m2 Laser Pulse Rate 127.5kHz Laser Pulse Mode Multi-pulse Laser return Types Four pulses, 1st, 2nd, 3rd, and 4th Laser Intensity Supplied on all returns Laser footprint size 0.41m File Format LAS Horizontal Datum GDA94 Vertical Datum AHD using Local Geoid Model Map Projection MGA Zone 54 Vertical Accuracy Specification 0.15m Horizontal Accuracy Specification < 0.25m System Calibration Certification Leica Geosystems AG (SN091PII+ Cal Report 080317) 17/03/09
Parent Information
Extents
[-33.165056, -31.762381, 141.936362, 143.291313]
Reference System
GDA94 / MGA zone 54
Spatial Resolution
Service Information
Associations
Downloads and Links
Source Information
AAMHatch has been engaged by Geoscience Australia to undertake a LiDAR survey over the BHMAR Phase 2 project 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. To this end, LiDAR data was acquired from a fixed wing aircraft between June 19th and August 5th 2009.