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: 2019-08-26 (publication)
Presentation form code: mapDigital
Online resource: Related resource:
Identifier: NAT.Relief\NAT.Contours10m
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 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.
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 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. Attributes within the data describe the source data for each feature and the accuracy of that source data. Source data has been obtained from: 1) 25cm contours generated form LiDAR (Eastern Coastal Areas) 2) 50cm contours generated from LiDAR (Logan City Council) 3) 5m contours captured by photogrammetry (South East QLD)10m contours captured by photogrammetry (North QLD) 4) 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)
Language: eng
Character set: unknown

Topic

ISO topic category codes: elevation

Spatial Data Information

Spatial representation type: vector
Coordinate Reference System EPSG code: EPSG:4939
Title: EPSG Geodetic Parameter
Dataset
Date: 2007-07-16 (revision)
Edition: Version 6.13

Contacts

Point of contact:
Organisation: Department of Resources
Address:
Owner:
Organisation: Department of Resources

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) 2022
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) 2022.

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: 2019-08-26

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 degrees). 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. Local Authority extents: The state wide dataset was cut into individual local authorities using the Local Authority Boundaries Dataset extracted from the Spatial Information Registry on the 03.06.2013 as the cutting polygons. Each local authority was then created as an individual dataset trimmed to the local authority boundary.

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): 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