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 : 2020-12-31 ( publication )
Presentation form code : mapDigital
Online resource: Related resource:
Identifier: nat.qld_contours_1metre_lidar
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 was captured using Airborne Laser Scanning (LiDAR). It consists of multiple project areas over multiple years. Please see the attribute data for information regarding project and year. Due to the size, only current projects are available in this dataset.
You cannot download the entire State in one single order, it is too large. This dataset allows you to extract your area of interest using the 'clip, zip and ship' functionality only. You can select areas by LGA in most cases and by 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 across the state of Queensland. The primary objective of this dataset is to provide a cartographic portrayal of Queensland's elevation and should be interpreted and utilised correctly. It is suitable for use in land administration, emergency management, topographic mapping and in the production of web-based mapping applications.
Additional Information:
Features within this dataset have been captured using: - LiDAR
Feature Types:
INTERMEDIATE CONTOUR – An imaginary line on the ground joining points of equal elevation with a 1 metre regular spacing above the Australian Height Datum. Every fifth Intermediate Contour, is classified as a Feature Type “Index Contour”
INDEX CONTOUR – An imaginary line representing every fifth “Intermediate Contour”. Index contours are evenly divisible by 5

Attributes:
FEATURE_TYPE (Feature Type) - Unique feature type that identifies the type of feature. (options: Intermediate Contour, Index Contour)
ATTRIBUTE_SOURCE (Attribute Source) - The source LiDAR capture project used to define what the feature is e.g., intermediate contour
ATTRIBUTE_DATE (Attribute Date) - Date of the source LiDAR capture project used for attributing the feature.
FEATURE_SOURCE (Feature Source) - The source LiDAR capture project that the spatial location of the feature was obtained from.
FEATURE_DATE (Feature Date) - Date of the source LiDAR capture project that the location of the feature was obtained from.
ELEVATION_M (Elevation (m)) - The elevation of the feature measured in metres in relation to the Australian Height Datum.
ELEAVTION_SOURCE (Elevation Source) - The source LiDAR capture project that the elevation of the feature was obtained from
ELEVATION_DATE (Elevation Date) - Date of the source LiDAR capture project that the elevation of the feature was obtained from.
ELEVATION_ACCURACY_M (Elevation Accuracy (+/-m)) - The vertical positional accuracy of the contour measured in metres (plus or minus e.g., +/- 0.3m)
PFI (PFI) - A Persistent Feature Identifier (PFI) is generated once for each feature at the point of creation. The value of the PFI will stay with the feature through all changes to the feature (both spatial and non-spatial) until the feature is retired.
UFI (UFI) - A Unique Feature Identifier (UFI) is generated once for each new feature at the point of creation (at this point the PFI and UFI will be the same). The value of the UFI will stay with the feature through all changes to the feature (both spatial and non-spatial) unless the feature is split into multiple other parts. If the feature is split, the separate parts will retain the original PFI but new UFI’s will be generated for the split parts.
UPPER_SCALE (Upper Scale) - The upper scale for which the feature should be considered suitable
TEXT_NOTE (Text Note) - For mapping purposes. Additional annotation that can be shown on a map
ADD_INFORMATION (Additional Information)
- A comment field (additional information)
Upperscale: 1:10,000
- all intermediate contours 1:25,000
– all data This dataset is stored in an ESRI Geodatabase. Some columns names may be shortened if downloaded in the ESRI shape format.
Language : eng
Character set : unknown

Topic

ISO topic category codes: elevation

Spatial Data Information

Spatial representation type : vector
Coordinate Reference System EPSG code: EPSG:7844
Title : EPSG Geodetic Parameter
Dataset
Date : 2007-07-16 ( revision )
Edition : Version 6.13

Contacts

Point of contact :
Organisation : Department of Natural Resources and Mines, Manufacturing and Regional and Rural Development
Address:
Delivery point : 1 William Street
City : Brisbane
State : Queensland
Postcode : 4000
Country : Australia
Email: support@spatial-qld-support.atlassian.net
Owner :
Organisation : Department of Natural Resources and Mines, Manufacturing and Regional and Rural Development

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 Resources) 2024
Licence : (as use constraint)
This material is licensed under a Creative Commons - Attribution 4.0 International licence.
Creative Commons License
The Department of Resources requests attribution in the following manner:
© State of Queensland (Department of Resources) 2024.

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: 2020-12-31

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 /GDA2020 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 GDA2020.
To improve performance, a Simplify tool was run over entire dataset using ArcDesktop Simplify Line Tool.
Using settings of POINTS REMOVED (Douglas-Peucker method) with 0.25m significance tolerance.
All features equal or less than a length of 0.0001dd were removed from the dataset.
All features under 10m in ELEVATION and equal or less than 0.0003dd were also removed.
Process step:
Update data annually in Feb/March
Contains 3+ years old data from the 31st of December.
Source:
https://elevation.fsdf.org.au/

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 : Contours over Queensland
Test specification:
Online resource:
Protocol : OGC:WMS-1.3.0-http-get-capabilities
Application profile : Web Map Service version 1.3.0
Name/identifier : 30
Description : This service provides a collection of contour lines at 10, 5 and 1 metre intervals over the state of Queensland. The data has been compiled from numerous source datasets and accuracies. Source data has been obtained from: * 25cm contours generated from various LiDAR projects (not state-wide coverage). * 5m contours captured by photogrammetry (South East QLD) * 10m contours captured by photogrammetry (North QLD) * 20m contours captured by photogrammetry and recompiled to 10m (North QLD) * Shuttle Radar Topography Mission (SRTM) 1 sec DEM-S (V1.0) (Predominately Western Queensland) Attributes within the data describe the source data for each feature. The 10m contours are displayed initially. As scale becomes larger these contours are replaced by higher-precision LiDAR contours. However, in areas lacking LiDAR coverage, the 10m contours retain visibility. Please note, there may be minor misalignments along the edges of LiDAR projects as they have not been matched to neighbouring projects or areas.
Website: https://spatial-gis.information.qld.gov.au/arcgis/services/Elevation/Contours/MapServer/WMSServer
Ordering information:
Fees : Nil
Instructions : For use in desktop and web applications capable of connecting to Open Geospatial Consortium (OGC) web map service endpoints.
Some clients append request parameters for the service capabilities file so depending on your client in use you may have to remove the parameters when copying the url below.

Format(s):
Name/identifier : Contours over Queensland
Online resource:
Protocol : WWW:LINK-1.0-http--link
Application profile : ArcGIS REST API
Name/identifier : 30
Description : This service provides a collection of contour lines at 10, 5 and 1 metre intervals over the state of Queensland. The data has been compiled from numerous source datasets and accuracies. Source data has been obtained from: * 25cm contours generated from various LiDAR projects (not state-wide coverage). * 5m contours captured by photogrammetry (South East QLD) * 10m contours captured by photogrammetry (North QLD) * 20m contours captured by photogrammetry and recompiled to 10m (North QLD) * Shuttle Radar Topography Mission (SRTM) 1 sec DEM-S (V1.0) (Predominately Western Queensland) Attributes within the data describe the source data for each feature. The 10m contours are displayed initially. As scale becomes larger these contours are replaced by higher-precision LiDAR contours. However, in areas lacking LiDAR coverage, the 10m contours retain visibility. Please note, there may be minor misalignments along the edges of LiDAR projects as they have not been matched to neighbouring projects or areas.
Website: https://spatial-gis.information.qld.gov.au/arcgis/rest/services/Elevation/Contours/MapServer
Ordering information:
Fees : Nil
Instructions : For use in desktop and web applications capable of connecting to ArcGIS REST map service endpoints.

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