Contours - 10 metre interval - by area of interest

Contours - 10 metre interval - by area of interest

Identification

Title : Contours - 10 metre interval - by area of interest
Alternative title : Elevation contours - 10 metre interval
Date : 2024-11-27 ( publication )
Presentation form code : mapDigital
Related resource:
Identifier: nat.qld_contours_10metre
Relationship to related resource : source

Description

Abstract / Description:
This dataset consists of 10 metre contours over the State of Queensland which has been compiled from numerous source datasets and generalized to an overall 1:50000 mapping accuracy to produce state wide 10m contour coverage.

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 local government area, city or suburb (locality) or freehand over small areas.
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:
This feature class has been created by merging 10 metre contours from numerous other feature classes to create a whole of state 10 metre contour coverage.
Sources include data captured using:
- LiDAR
- Photogrammetry
- Shuttle Radar Topographic Mission (SRTM)

Feature Types:
AUXILIARY CONTOUR – An imaginary line on the ground joining points on the ground with an elevation of 5 metres
INDEX BATHOMETRIC CONTOUR – An imaginary line representing every fifth intermediate bathometric contour.
INDEX CONTOUR – An imaginary line representing every fifth intermediate contour.
INDEX DEPRESSION CONTOUR – An imaginary line representing every fifth intermediate depression contour
INTERMEDIATE BATHOMETRIC CONTOUR – An imaginary underwater line joining points of equal elevation with a regular 10 metre spacing below the Australian Height Datum. Every fifth Intermediate Bathometric Contour, is classified as an Index Bathometric Contour
INTERMEDIATE CONTOUR – An imaginary line on the ground joining points of equal elevation with a 10 metre regular spacing above the Australian Height Datum. Every fifth Intermediate Contour, is classified as an Index Contour
INTERMEDIATE DEPRESSION CONTOUR – An imaginary line on the ground joining points of equal elevation with a 10 metre regular spacing above the Australian Height Datum, where the portion of a landform dips below its surrounding area. Every fifth Intermediate Depression Contour, is classified as an Index Depression Contour NOTE:- Only Intermediate Contours and Index Contours are currently classified Attributes:
FEATURE_TYPE (Feature Type) - Unique feature type that identifies the type of feature. (options: Auxiliary Contour, Index Bathometric Contour, Index Contour, Index Depression Contour, Intermediate Bathometric Contour, Intermediate Contour, Intermediate Depression Contour)
ATTRIBUTE_SOURCE (Attribute Source) - The source imagery, map, or data used to define what the feature is e.g., index contour
ATTRIBUTE_DATE (Attribute Date) - Date of the source map or data where the name of the feature was obtained from.
FEATURE_SOURCE (Feature Source) - The source imagery, map, or data that the spatial location and shape of the of the feature was obtained from.
FEATURE_DATE (Feature Date) - Date of the source imagery, map, or data that the spatial location and shape 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. This field only relates to Capes, Mountains and Passes otherwise left blank
ELEAVTION_SOURCE (Elevation Source) - The digital elevation model, map, or data that the elevation of the feature was obtained from
ELEVATION_DATE (Elevation Date) - Date of the digital elevation model, map, or data 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., +/- 5m)
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:
1:100,000 – all contours evenly divisible by 10 except for the following
1:250,000 – all contours evenly divisible by 50 except for the following
1:1,000,000 – all contours evenly divisible by 100 except for the following
1:2,500,000 – all contours evenly divisible by 250

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 : completed
Maintenance and update frequency : asNeeded

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 : 138.000
East bounding longitude : 155.000
South bounding latitude : -29.500
North bounding latitude : -9.000
Temporal extent:
Start: 2010-01 End: 2024-11-27

Data Quality

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


The collection of feature types will be complete. This dataset does not contain the zero metre contour as this is below high water.

Positional accuracy (external, absolute):


The horizontal positional accuracies of the datasets that have been used to compile the state wide dataset are generally as below: 1) 25cm contours generated from LiDAR (South East QLD): +/-0.3m H +/-0.15m V 2) 50cm contours generated from LiDAR (Logan City Council): +/-0.45m H +/-0.15m V 3) 5m contours captured by photogrammetry (South East QLD): +/-3.0m H +/-2.5m V for digital capture, +/-12.5m H +/-2.5m V from repromats 4) 10m contours captured by photogrammetry (North QLD): +/-5.0m H +/-3.5m V for digital capture, +/-25m H +/-3.5m V scanned from repromats 5) 20m contours captured by photogrammetry and recompiled to 10m (North QLD): +/-5.0m H +/-3.5m V for digital capture, +/-25m H +/-3.5m V scanned from repromats 6) Shuttle Radar Topography Mission (SRTM) 1 sec DEM-S (V1.0) (Predominately Western Queensland): +/-7.2m H

Attribute accuracy (quantitative):


Attribution is completed and agrees with Topographic Data Product Description requirements.

History:

Lineage statement:
In broad terms, the production process involved generating/deriving 10m contours for each of the source datasets and merging them together into a seamless dataset.
Each type of source dataset required different types of processing to generate contours.
Common to all sources was a process of generalisation to thin vertices, smooth and remove spikes and achieve a consistency in ‘detail’ or resolution of the contour lines.
Finally, contours from the different sources were merged ensuring matching off edges.
SRTM derived Contours:
a) A single mosaic was generated from the DSM_H (V1.0) ESRI grid files using ArcMap.
b) The Mosaic was re-tiled into overlapping tiles with a 500m overlap using ArcMap.
c) A value of 1.287 was subtracted from the height values of the DEM tiles to adjust to AHD. (Value obtained from SRTM metadata statement).
d) 10m contours were generated for each of the overlapping tiles using ArcMap (3D extension).
e) The contour tiles were clipped back to the original tiles to remove overlap using ArcMap.
f) Contours were smoothed using ArcMap (PAEK Algorithm).
g) Contours were generalised using SAFE FME.

Photogrammetrically derived contours: 10 metre contours derived from 1:50000 photogrammetry for the western portion of Cape York and the Southern gulf were complete and required no further processing.
Contours derived from 1:50000 photogrammetry for the eastern portion of Cape York and North QLD originally had 20m (or greater) intervals.
Similarly, portions of the 5 metre contours derived from 1:25000 photogrammetry had 20m (or greater) intervals, or irregular intervals, e.g. 15m, 25m, etc.
In both cases, regular 10m contours were regenerated by:
a) Generating a DEM from the existing contours (using pixel size 0.0002°).
b) Re-generate contours using same steps described the SRTM contours.
LiDAR Contours:
a) 10 metre LiDAR contours were extracted from existing 0.25m contours by script.
b) Contours were smoothed, then generalised.

Edge matching: Matching contours from different data sources was undertaken by using ArcMap to generate surface models over the overlap areas.
This in effect “blended” the two sources together.
Contours were regenerated for the overlap area and a “cookie-cut” replacement made into the base contours.
Note that in some areas, contours of different sources differed to a degree that manual intervention was required to merge the two together.

Data Clean: To eliminate issues where 10m contours coincided with Queensland waterbodies, these were manually investigated and removed where necessary. DNRME’s Reservoirs (with areas above size 0.9 km2) and Lakes (with areas above size 0.45 km2) were loaded in ArcMap and any isolated 10m contours within these waterbodies were deleted. Any waterbody areas less than the above stated sizes were not investigated. A visual check of data in ArcMap was also utilised to complete an audit to remove duplicate contours

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 : 10
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 : 10
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) : 500
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
Hierarchy level description : dataset
Identifier : 9D408391-8393-4B8E-A9C0-E468C2ECC1FF
Parent identifier : x
Metadata date stamp: 2016-12-22
Language : eng
Character set : utf8
Metadata standard name : ISO 19115:2005, ANZLIC ISO 1.1
Metadata version name : QGIS