Authors / CoAuthors
Abstract
1. Tongatapu Bathymetric LiDAR 2. Tongatapu Topographic LiDAR
Product Type
dataset
eCat Id
76753
Contact for the resource
Custodian
Owner
Custodian
Cnr Jerrabomberra Ave and Hindmarsh Dr GPO Box 378
Canberra
ACT
2601
Australia
Keywords
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- Airborne Digital Data
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- TO
- Australian and New Zealand Standard Research Classification (ANZSRC)
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- Photogrammetry and Remote Sensing
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- Published_Internal
Publication Date
2012-01-01T00:00:00
Creation Date
Security Constraints
Legal Constraints
Restrictive GA Licence (please provide TRIM link)
Access - restricted
Use - license
Status
Purpose
Maintenance Information
asNeeded
Topic Category
elevation
Series Information
Lineage
Project AAM Pty Ltd has been contracted by Geoscience Australia (GA) to capture and supply aerial topographic and bathymetry LiDAR & imagery surveys in the Kingdom of Tonga, over requested areas around Tongatapu and Lifuka Islands, to assist future coastal planning and management, assess vulnerability to climate change and identify adaptation options in response to coastal inundation. Topographic LiDAR was acquired at Tongatapu Island from six (6) flights on 3rd October, 11th October, 12th October, 21st October, 22nd October and 23rd October 2011 and Lifuka Island from one (1) flight on 24th October 2011. Bathymetric LiDAR and aerial photography was acquired at Tongatapu Island from eight (8) flighs on 5th September, 8th September, 9th September and 11th September, 12th September, 13th September, 14th September and 15th September 2011 and Lifuka Island from one (1) flight on 9th September 2011. Data This volume contains the following: 1. Tongatapu Bathymetric LiDAR: a. Tiled 1km x 1km fully classified, fully calibrated LAS data in the stipulated formats outlined below. 2. Tongatapu Topographic LiDAR a. Tiled 1km x 1km fully classified, fully calibrated LAS data in the stipulated formats outlined below. Safety: No safety Incidents were reported during the project. Acquisition: Topographic LiDAR was acquired from a fixed wing aircraft at Tongatapu Island from six (6) flights on 3rd October, 11th October, 12th October, 21st October, 22nd October and 23rd October 2011 and Lifuka Island from one (1) flight on 24th October 2011. Bathymetric LiDAR and aerial photography was acquired from a fixed wing aircraft at Tongatapu Island from eight (8) flighs on 5th September, 8th September, 9th September and 11th September, 12th September, 13th September, 14th September and 15th September 2011 and Lifuka Island from one (1) flight on 9th September 2011. Ground Support: GPS data was logged for all flights without incident. Ground check points acquired by AAM allowed an assessment of the accuracy of the ALS and AP 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 (Topographic LiDAR only): Vegetation: Vegetation points have been classified using an automatic algorithm tailored for the project area. Manual checking of Vegetation points has been undertaken. There may be minimal instances of non-ground strikes being incorrectly classified as vegetation and conversely vegetation strikes remaining classified as non-ground. Buildings: Building points have been classified using an automatic algorithm tailored for the project area. Manual checking of building points has been undertaken. There may be minimal instances of non-ground strikes being incorrectly classified as buildings and conversely building strikes remaining classified as non-ground. Non-ground: Non-ground points have been filtered by removing points within 0.1m of the ground surface to reduce incidence surface `noise'. Points classified as non-ground may include laser strikes on the surface of water bodies. Data Presentation: The data provided on this volume has been supplied in accordance with a specification agreed with the primary client. The point density of the acquired data (>4pts/sqm - topographic LiDAR) 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. SOURCE DATA Item Source Description Ref No Date Laser System Topographic AAM ALTM-Orion
Parent Information
Extents
[0.0, 0.0, 0.0, 0.0]
Reference System
Spatial Resolution
Service Information
Associations
Downloads and Links
Source Information
KINGDOM OF TONGA 2011 - TONGATAPU AND LIFUKA ISLANDS LiDAR 2011