Note: this dataset description is metadata (data about data) which describes the actual dataset in accordance with the ANZLIC (Australia New Zealand Land Information Council) Core Metadata Guidelines Version 2 (February 2001)
ANZLIC unique identifier: ANZNS0404001262
Title: NEW SOUTH WALES DIGITAL TOPOGRAPHIC DATABASE DTDB
Custodian: Department of Information Technology and Management (LPI)
Jurisdiction: New South Wales
There are 1105 Digital DTDB spatial partitions covering New South Wales. Depending on the stage of capture, update and upgrade they may contain a Cultural Layer (CUL) comprising the Transportation, Facilities and Utilitiy Themes, a Drainage Layer (DRN) containing the Hydrography Theme, a Contour Layer (CON) comprising the contour component of the Landform Theme, a Building Layer (BLD) comprising the Buildings and Habitation Theme, a Built Up Area Layer (BUA) containing details of Built up areas, a Distinctive Land Surface Layer (DLS) containg land surface features which supplement the contour data and a Names Layer (TTM). Also available are various forms of Digital Imagery and Digital Landform Models. The layer / partitions generally correspond to 1:25000, 1:50000 and 1:100000 mapping areas represented on the Australian National Map Sheet Breakdown System in either AGD66 or GDA94 datums.
- ENERGY Electricity
- ENERGY Petroleum
- LAND Topography
- MARINE Coasts
- MARINE Estuaries
- PHOTOGRAPHY AND IMAGERY
- PHOTOGRAPHY AND IMAGERY Aerial
- TRANSPORTATION Land
- UTILITIES
- WATER Hydrology
- WATER Lakes
- WATER Rivers
- Geographic extent name:
- NEW SOUTH WALES - State or Territory - New South Wales
- Geographic extent polygon:
- 141 -37.5, 154 -37.5, 154 -28, 141 -28, 141 -37.5
Note: The format for each Geographic extent name is: Name - Identifier - Category - Jurisdiction (as appropriate)
Geographic bounding box:
The bounding box encloses the maximum extents of the dataset. There may be voids or gaps within the bounding box, depending on the defined coverage of the dataset. Outer bounding rectangle as Latitude/Longitude coordinates based on the WGS84 datum (expressed as both Degrees Minutes Seconds and as decimal Degrees):
- North bounding latitude: 28 00 00.0 S (-28)
- South bounding latitude: 37 30 00.0 S (-37.5)
- East bounding longitude: 154 00 00.0 E (154)
- West bounding longitude: 141 00 00.0 E (141)
Lineage:
Topographic line features captured from photogrammetric compilations prepared from Aerial Photography, Field Completion and Cartographic Enhancement by the Land Information Centre. Scanned and vectorised on Optigraphics 3100 to ODF files for editing using MEWS software then translated to Genamap Import files for final editing. Data Quality Assured and progressively upgraded through comparison with current maps, directories and aerial photography by the Land Information Centre. Limited update to country towns with populations exeeding 400 persons utilising 1996 colour aerial photography at a nominal photo scale of 1:16000, and through locally dervied information where possible. Upgrade program commenced in 1998 utilising scanned orthophoto imagery produced at a scale of 1:50000 and a small amount of mobile GPS entry.
Positional accuracy:
Initial digital collection is within 0.3mm of map transparency at scales of 1:25000, 1:50000 and 1:100000.
HORIZONTAL ACCURACY - Ten percent of well defined points tested will not be in error by more than 0.5mm of the scale of the source document.
Subsequent data alterations or additions are reflected by their capture code ranging from orthophoto trace or mobile GPS fixation for recent updated data with an accuracy of 12.5 metres to an estimate of true position with an accuracy of up to 100 metres.
Refer to individual entries for Digital Landform Models and Imagery.
Attribute accuracy:
All DCDB data and linkages within the Genamap/Oracle environment are subject to automatic verification, ensuring 100% data integrity.
Logical consistency:
All points are labelled
All lines intersect at nodes
Lines do not cross unintentionally.
All lines do not exist. The data may contain construction lines.
There are no duplicate lines.
Lines do not overshoot or undershoot.
All lines are not labelled.
All polygon boundaries close.
All polygons are labelled.
All points, lines and polygons are topologically related.
Where data is stored in partitions, these are edge matched against adjoining partitions where applicable.
Completeness:
Spatial data is complete for updated and upgraded partitions and themes within the data set. However content is generally incomplete when compared to existing printed topographic maps. As partitions and themes are updated and upgraded they are brought up to 100% completeness.
Attribute data is available where applicable for partitions and themes within the data set. There are no data thresholds used.
This dataset description complies with ANZLIC Core Metadata Guidelines Version 2 (February 2001) and XML DTD ANZMETA NSW NRIMS Page 1 v1.0 which extends ANZMETA 1.3 (metadata validation date: 2004-07-11)