Contours - 1 metre - Queensland - by area of interest

Contours - 1 metre - Queensland - by area of interest

Identification

Title: Contours - 1 metre - Queensland - by area of interest
Alternative title: Contours 1 metre
Date: 2018-05-18 (publication)
Presentation form code: mapDigital
Online resource: Online resource:
Website:
Related resource:
Identifier: NAT.Relief\NAT.Contours1m
Relationship to related resource: source

Description

Abstract / Description:
This data is a collection of 1 metre contours over parts of the State of Queensland. The original source data that this data was compiled from was captured using Airborne Laser Scanning (LiDAR).
You cannot download the entire State in one single order, it is to large. This dataset allows you to extract your area of interest using the 'clip, zip and ship' functionality only. You can select areas by local government area, city or suburb (locality) or freehand over small areas. You cannot download the entire State in one single order.
Data does not cover the whole of the State.
Purpose:
To provide digital elevation data for use in Land Administration, Emergency Management, Monitoring of Climate Change, Hydrological Modelling, and Topographic Mapping and in the production of Navigational and Web Based Mapping applications.
Additional Information:
This data is a subset of the 25 centimetre contour datasets generated from LiDAR. Attributes within this data describe the source and reliability of the original 25 centimetre contour datasets.
LiDAR captured data is available from Coolangatta to Cooktown along the eastern seaboard and to varying distances inland as a solid block of data. LiDAR captured data is also available over most inland towns.
To obtain this original LiDAR data, please contact SIProductdelivery@dnrme.qld.gov.au
Language: eng
Character set: unknown

Topic

ISO topic category codes: elevation

Spatial Data Information

Spatial representation type: vector
Coordinate Reference System EPSG code: EPSG:4283
Title: EPSG Geodetic Parameter
Dataset
Date: 2007-07-16 (revision)
Edition: Version 6.13

Contacts

Point of contact:
Organisation: Department of Natural Resources, Mines and Energy
Address:
Delivery point: 275 George Street
City: Brisbane
State: Qld
Postcode: 4000
Country: Australia
Email: opendata@dnrme.qld.gov.au
Owner:
Organisation: Department of Natural Resources, Mines and Energy

Status

Progress status: onGoing
Maintenance and update frequency: irregular

Data / Resource Constraints

Resource Access Level: -->
Security classification (ISO 19115): unclassified
Copyright: (as use constraint)
© State of Queensland (Department of Natural Resources, Mines and Energy) 2020
Licence: (as use constraint)
This material is licensed under a Creative Commons - Attribution 4.0 International licence.
Creative Commons License
The Department of Natural Resources, Mines and Energy requests attribution in the following manner:
© State of Queensland (Department of Natural Resources, Mines and Energy) 2020.

Temporal and Spatial extents:

Bounding box:
West bounding longitude: 138.059
East bounding longitude: 152.760
South bounding latitude: -28.978
North bounding latitude: -12.590
Temporal extent:
Start: 2013-06-30 End: 2014-09-19

Data Quality

Data quality scope:
Level: dataset
Completeness (omission):

The collection of feature types for a project will be complete. Additional projects will be continuously added untill all project have been included.
Consistency (conceptual):

Data should be free from overshoots, undershoots, duplicate lines. Lines with the same elvation within the same project and location should be continuous.
Positional accuracy (external, absolute):

The accuracy of the data will depend on the accuarcy of the original project. Generally for data captured by LiDAR, the accuracies will be:
+/-0.3m Vertical @ 95% confidence level
+/-0.8m Horizontal @ 95% confidence level
Contours have been simplified using a tolerance of 0.25 metred to address problems with useability and size of the dataset.
Attribute accuracy (non quantitative):

Attribution is complete.

History:

Lineage statement:
The original source data was captured by project using Airborne Laser Scanning from a fixed wing aircraft with the acquisition over tidal areas being undertaken within +/- 2 hours of low tide. The capture of airborne LiDAR was supported by the establishment of GPS base stations with aerial control maintained via the LiDAR systems IMU and the GPS base stations.

Laser strikes have been classified into ground and non-ground based upon algorithms tailored for major terrain - vegetation combinations existing in the project area. The definition of the ground may be less accurate in isolated pockets of dense vegetation and certain types of vegetation such as sugar cane.

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 may be 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.

From this ground dataset, contours with a 25 centimetre interval in height are generated. Data is stored in MGA coordinates in GDA94 in either 1 km or 2 km tiles depending on the project specifications with heights being recorded in AHD71. The tile number is either the coordinate of the North West or South West corner of the tile.

This dataset was compiled by extracting out the 1 metre contour from the exiting 25 centimetre contour datasets. As the original data is stored in either 1 km or 2 km tiles and in project areas, the data has been merged into continuous line strings within a project and location. The data is also converted to latitude and longitude in GDA94.

Feature Types:

BASIC CONTOUR - An imaginary line on the ground joining points of equal elevation at a regular spacing of 1 metre above the Australian Height Datum. Contours with an elevation evenly divisible by 5 are classified as major contours e.g. 5m, 10m 15m.
MAJOR CONTOUR - An imaginary line on the ground joining points of equal elevation at a regular spacing of 5 metres above the Australian Height Datum.

Attributes:

FEATURE - Unique feature type that identifies the topographic feature e.g. Major Contour.
TYPE - For use in ESRI Geodatabase only (display purposes)
ELEVATION - Elevation in metres in relation to the Australian Height Datum
FEATURERELIABILITY - Reliability date of the source information
FEATURESOURCE - The data that the spatial location of the feature was obtained from.
ATTRIBUTERELIABILITY - Reliability date of the data that the name of the feature was acquired from.
ATTRIBUTESOURCE - The data used for attributing (naming) of the feature e.g. Major Contour
PLANIMETRICACCURACY - The standard deviation of the horizontal positional accuracy.
ELEVATIONACCURACY - The vertical accuracy of the data to the nearest metre

Distribution

Format(s):
Name/identifier: Queensland Spatial Catalogue
Specification: Download Service
Online resource: Ordering information:
Instructions: Open the Queensland Spatial Catalogue (QSpatial). Select the large SEARCH button and all available records are displayed. Select one of the four filter options provided and then the further options within the filter. The resultant search is then displayed. Select your record and complete the order.

Format(s):
Name/identifier: downloadableData
Version: 10.0
Specification: ESRI ArcGIS Server Geoportal Extension Content Type

Distributor:
Format(s):
Name/identifier: From the Queensland Spatial Catalogue available as ESRI Shape file SHP, MapInfo Tab file TAB, ESRI file geodatabase FGDB, Google file KMZ, and Geopackage version 1.0, 1.1, or 1.2 file GPKG

Transfer size (megabytes): 20
Online resource:
Transfer options:
Online resource:
Website: Function: download

Web Service Finder:
Instructions: Use the URL to search QSpatial for web services displaying or using this dataset.

Metadata Reference Information

Hierarchy level (scope of the metadata): dataset
Identifier: {10AECA92-F8A4-4D38-9795-1CCFD8564EBD}
Parent identifier: x
Metadata date stamp: 2018-05-18
Language: eng
Character set: utf8
Metadata standard name: ISO 19115:2005, ANZLIC ISO 1.1
Metadata version name: QGIS