Queensland LiDAR data (Gladstone Project) - Gladstone Regional Council (LGA)  

Authors / CoAuthors

Grove, R.

Abstract

These datasets cover approximately 4500 sq km along the entire coastal strip of the Gladstone Regional Council and over all of Curtis and Facing Islands and are part of the 2009 Gladstone LiDAR capture project. This project, undertaken by Fugro Spatial Solutions Pty Ltd on behalf of the Queensland Government captured highly accurate elevation data using LiDAR technology. Available dataset formats (in 2 kilometre tiles) are: - Classified las (LiDAR Data Exchange Format where strikes are classified as ground, non-ground or building) - 1 metre Digital Elevation Model (DEM) in ASCII xyz - 1 metre Digital Elevation Model (DEM) in ESRI ASCII grid - 0.25 metre contours in ESRI Shape

Product Type

dataset

eCat Id

75814

Contact for the resource

Keywords

• Airborne Digital Data

• AU-QLD

Australian and New Zealand Standard Research Classification (ANZSRC)

• Surface Processes

• Published_Internal

Publication Date

2011-01-01T00:00:00

Creation Date

Security Constraints

Australian Government Security ClassificationSystem    

Classification - unclassified

Legal Constraints

Special, MOU, etc.

Access - restricted

Use - license

Status

Purpose

Maintenance Information

unknown

Topic Category

elevation

Series Information

Lineage

LI_Lineage: ACQUISITION Airborne Laser Scanning (ALS) data was acquired for the Gladstone project from a fixed wing aircraft between 12 June 2009 and 30 July 2009. Acquisition over tidal areas was undertaken within +/- 2 hours of low tide. DATA PROCESSING The sensor trajectory and ALS range measurements were integrated to produce the ALS point cloud. Once point cloud data was imported into a tiled format, each tile was filtered to isolate the ground surface returns from non ground surface returns. Areas where flight lines overlap were isolated and the ground surface models from individual flight lines compared to one another. A least squares surface matching application was employed to solve small systematic differences in sensor position (namely height) and orientation (namely roll). The differences solved for were in the order of the expected precision of the sensor trajectory, namely +/0.075m for height and +/-0.005 degrees for roll. Elevations of check points were compared with those derived by construction a ground surface model from the ALS ground surface model at the given 2D location. Fugro Spatial Solutions Pty Ltd aim is to select those points that are part of a clean ground surface, which might not be 100% of the ground hits. This results in a cleaner dataset, without compromising on terrain detail and accuracy. Ground filtering algorithms, tailored for this project, data type and terrain type, are applied to the full dataset. The ground filtered dataset is then visually checked by an operator, and incorrectly classified data is corrected or the ground filtering algorithm is adjusted and then visually checked. For the verification of the ground classifications, intensity imagery is used as a backdrop image. Any LiDAR return, not classified as ground, but higher than ground (>30cm above ground), is classified as non-ground return.

Parent Information

Extents

[0.0, 0.0, 0.0, 0.0]

Reference System

GDA94 / MGA zone 56 (EPSG:28356)

Spatial Resolution

Service Information

Associations

Downloads and Links

Source Information

These datasets cover approximately 4500 sq km along the entire coastal strip of the Gladstone Regional Council and over all of Curtis and Facing Islands and are part of the 2009 Gladstone LiDAR capture project. This project, undertaken by Fugro Spatial Solutions Pty Ltd on behalf of the Queensland Government captured highly accurate elevation data using LiDAR technology. Available dataset formats (in 2 kilometre tiles) are: - Classified las (LiDAR Data Exchange Format where strikes are classified as ground, non-ground or building) - 1 metre Digital Elevation Model (DEM) in ASCII xyz - 1 metre Digital Elevation Model (DEM) in ESRI ASCII grid - 0.25 metre contours in ESRI Shape