Darwin and Surrounds LiDAR 2009  

Authors / CoAuthors

Abstract

Darwin and surrounds LiDAR 2009 data was flown by Dugro Spatial Solutions Ltd between 4th and 5th of July 2009 as part of the Urban Digital Elevation Modelling in High Priority Areas Project funded by the Federal Department of Climate Change. Distibution of this product is in file format of 1km tiles, and 1m DEM data in ESRI floating point file format. The data has a horizontal accuracy of 0.15m (at one SD) and vertical accuracy of 0.2m (at one SD).

Product Type

dataset

eCat Id

70669

Contact for the resource

Keywords

• DEM topographic

( Theme )

• DEM

• AU-NT

Australian and New Zealand Standard Research Classification (ANZSRC)

• Topology

• Published_Internal

Publication Date

2010-01-01T00:00:00

Creation Date

Security Constraints

Australian Government Security ClassificationSystem    

Classification - unclassified

Legal Constraints

Special, MOU, etc.

Access - restricted

Use - license

Status

Purpose

Maintenance Information

notPlanned

Topic Category

elevation

Series Information

Lineage

CLASS 2 GROUND 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. CLASS 1 UNCLASSIFIED ABOVE GROUND Any lidar return, not classified as ground, but higher than ground (>30cm above ground), is classified as unclassified above-ground return CLASS 7 NOISE Point close to the classified ground surface (low grasses), point below the ground surface (as result of multipath returns from the lidar system) and points high in the air that are not likely to be a valid return (birds, cloud or rain) have been classified to the noise point class ESRI Floating point gridded DEM A 1m DEM has been generated from the lidar ground surface. The method of deriving the height for each grid point is by triangulation between the three nearest lidar ground points. This data has not been field tested for completeness or accuracy. NEDF Metadata Acquisition Start Date: 4/07/2009 Acquisition End Date: 5/07/2009 Sensor: LiDAR Device Name: Leica ALS50-II (S/N: 087) Flying Height (AGL): 2012 INS/IMU Used: IPAS10 Number of Runs: 96 Number of Cross Runs: UNK Swath Width: 1424 Flight Direction: Non Cardinal Swath (side) Overlap: 10 Horizontal Datum: GDA94 Vertical Datum: AHD71 - using local Geoid model Map Projection: MGA52 Description of Aerotriangulation Process Used: - Description of Rectification Process Used: - Spatial Accuracy Horizontal: 0.15 Spatial Accuracy Vertical: 0.2 Average Point Spacing (per/sqm): 0.96 Grid Resolution: 1 Laser Return Types: 4 pulses (1st 2nd 3rd 4th and intensity) Data Thinning: - Laser Footprint Size: 0.45 Surface Type: DEM Product Type: GRID Distribution Format: ESRI GRID Calibration certification (Manufacturer/Cert. Company): Fugro Spatial Solutions Pty Ltd Limitations of the Data: This data has not been field tested for completeness or accuracy. Processing/Derivation Lineage: Fugro Spatial Solutions Pty Ltd WMS: http://WIN-UDEM2:8399/arcgis/services/Adelaide_2009/MapServer/WMSServer?

Parent Information

Extents

[-12.7617, -12.1395, 130.3388, 131.1343]

Reference System

Spatial Resolution

Service Information

Associations

Downloads and Links

Source Information

Darwin and Surrounds LiDAR 2009