Input Dataset

NSW Digital Topographic Database

Theme

Transport

Jurisdiction

NSW

Custodian

The NSW Digital Topographic Database ( DTDB) is a seamless state-wide digital representation of terrain, place names, and visible features on the Earth’s surface within NSW. It is one of the foundation datasets of the New South Wales (NSW) Spatial Data Infrastructure (SDI). There are four (4) themes within the DTDB: Cultural, Hydrography, Physiography and Transportation. The cultural theme consists of features whose primary characteristic are of a cultural (man-made) origin, but generally not including transportation related features. The hydrography theme consists of features whose primary characteristics relate to water or drainage networks. The physiography theme consists of features whose primary characteristics relate to land surface or land form. The transportation theme consists of features whose primary characteristics relate to transportation. There are a total of 42 feature classes included in the DTDB which consist of Aggregated Way, Aggregated Way Segment, Cableway, Classified Fire Trail, Crossing, Ferry Route, Railway, Road Segment, Road Name Extent, Runway, Traffic Control Device, Transport Facility Line, Transport Facility Point, Building Complex Point, Electricity Transmission Line, General Cultural Area, General Cultural Line, General Cultural Point, Pipeline, Place Area, Place Point, Points of Interest, Tank Area, Tank Point, Utility Water Supply Canal, Contour, DLS Area, DLS Line, DLS Point, Fuzzy Extent Area, Fuzzy Extent Line, Fuzzy Extent Point, Relative Height, Spot Height, Ancillary Hydro Point, Coastline, Fuzzy Extent Water Area, Fuzzy Extent Water Line, Hydro Area, Hydro Line, Hydro Point and Named Water course. Cableway, Coastline, Contour, Crossing, DlsArea, Electricity Transmission line, Ferry Route, Fuzzy extent area, general cultural area, Hydro area, hydro line, Named water course, Pipeline, Place area Place Point, Point of interest, railway, relative hieghts, roadsegment, runway, spotheights, tank area, tankpoint, traffic control device, utility water supply feature classes are available for online downloading with reduced attributes.For further information on each feature class and its attributes, refer to the respective metadata record or the Digital Topographic Database Data Dictionary. The Digital Topographic Database ( DTDB) is primarily used for resource management, environmental management, land use planning, agriculture management, emergency management and recreational purposes.

Metadata Address

https://sdi.nsw.gov.au/catalog/search/resource/details.page?uuid=99140c9a-9387-4…

Dataset Purpose

The DTDB is primarily used for planning, developmental activities, navigation and resource monitoring by emergency services, the Defence Forces, environmental resource managers and engineers. This information is also commonly used by bushwalkers, canoeists, anglers and fossickers to establish a detailed picture of the local environment.

Funding Support

Access Format

GeoDatabase(gdb), Shape(shp), ESRI SDE, Well Known Text(wkt), Data Exchange Format(dxf),Oracle(SDO), MapInfo(MID/MIF/TAB)

Dataset Lineage

The original mapping information that constitutes the DTDB was initially created from 1970 at 1:25 000, 1:50 000 and 1:100 000 scales from stereoscopic aerial photography supported by ground truth, field data capture and updating. These scales have an inherent accuracy as per the National Mapping Council of Australia, Standards of Map Accuracy (1975). Therefore, the position of the feature instance will be within 0.5mm at map scale for 90% of the well-defined points. That is, 1:25000 = 12.5 m, 1:50000 = 25 m and 1:100000 = 50 m. The original manuscripts were scanned and vectorised and translated to Genamap files. Beginning in 2004, the data was migrated to an ESRI geodatabase. Since then the database has been continuously updated and upgraded through a program of external data integration from custodial and other sources, data matching and data verification of other internal and external databases, field investigation and research, as well as through Land and Property Information (LPI)’s regular cycle of updating aerial imagery of 10 cm, 50 cm and 2.5 m GSD. The programs address the content correctness, currency and accuracy of different Feature Classes on a continuous or cyclical basis. The specific programs utilised for the maintenance of each feature are largely defined by the Capture Source Attribute attached to the feature. Data is updated via multiple source programs and captured using various methods; Registered Image Trace, Ortho Image Trace of 10 , 20 and 50 cm ground sample distance imagery from ADS and 2.5 m from SPOT 5 imagery , Table Digitisation , DCDB , Scan / Vectorise , Differential GPS , Non-corrected , Comparative estimate , Survey Controlled , Mobile GPS , Stereo Image Trace Aggregation or replication of existing line segments , Engineering Design File (CAD) Scanned Map Image Trace , Positioned within features cadastral or ortho image extent. Some capture methods are unknown which may occur where data was supplied by an external source where the data capture method is undefined. Depending on the capture source, capture method, digital update and control point upgrade, every feature instance reportedly has a positional accuracy within the range of 1 m-100 m. It is important to note that not all features may be captured within the database for each feature class, and may not be an accurate representation of the current state.