Hydrography, Linear (250K Statewide)
Geoscience Australia
Series 3 contains a medium scale vector representation of the topography of
Australia. The data include the following ten themes and 92 feature classes:
Cartography:
Annotations, CartographicLines, CartographicPoints, GraticuleAnnotations,
Graticules, GridAnnotations and Grids.
Elevation:
Contours, BenchMarks, HorizontalControlPoints and SpotElevations.
Framework:
ProhibitedAreas, Reserves, FrameworkBoundaries, Islands, LargeAreaFeatures,
Locations, Mainlands, Seas, GeodataIndexes and MapIndexes.
Habitation:
BuildingAreas, BuildingPoints, BuiltUpAreas, CemeteryAreas, CemeteryPoints,
Homesteads, PlaceNames, PopulatedPlaces and RecreationAreas.
Hydrography:
CanalLines, Locks, RapidLines, Spillways, WatercourseLines, WaterfallPoints,
Bores, CanalAreas, Flats, Lakes, PondageAreas, RapidAreas, Reservoirs, Springs,
WatercourseAreas, Waterholes, WaterPoints, MarineHazardAreas,
MarineHazardPoints and ForeshoreFlats.
Infrastructure:
AerialCableways, DamWalls, Fences, MarineInfrastructureLines,
MarineInfrastructurePoints, VerticalObstructions, WaterTanks, Yards, Conveyors,
MineAreas, MinePoints, PetroleumWells and StorageTanks.
Terrain:
Caves, Craters, DeformationAreas, Discontinuities, Pinnacles, SandRidges and
Sands.
Transport:
AircraftFacilityPoints, RailwayBridgePoints, RailwayCrossingLines, Railways,
RailwayStopPoints, RailwayTunnelLines, RailwayTunnelPoints, BarrierPoints,
FerryRouteLines, FootTracks, RoadCrossingLines, RoadCrossingPoints, Roads,
RoadTunnelLines and RoadTunnelPoints.
Utility:
Pipelines and Powerlines.
Vegetation:
ClearedLines, CultivatedAreas, NativeVegetationAreas and Windbreaks.
Western Australia
(all coordinate values expressed in Decimal Degrees)
North Bounding Latitude: -13.747460
South Bounding Latitude: -35.084480
East Bounding Longitude: 129.001396
West Bounding Longitude: 113.353920
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.
Geographic System
GDA 1994
Australian Height Datum (1971)
09-05-2006
Current
Current
Iregular
ArcSDE Layer
Any ESRI format
The data are subject to Commonwealth of Australia Copyright. A licence agreement is required and a licence fee is also applicable for packaged data (included in the purchase price). Geodata TOPO250K Series 3 replace Series 1 and 2.
GEODATA TOPO 250K Series 3 is primarily sourced from GEODATA TOPO 250K Series 2 and 1:250 000 scale map reproduction material (from the National Topographic Map Series and Defence Joint Operation Graphics). A key revision source for the data is satellite imagery taken from the SPOT Panchromatic and LANDSAT Thematic Mapper Sensors. Revision material has also been gathered from a variety of authoritative sources. More information about the sources for this data can be found in Geoscience Australia's Topographic Data and Map Specifications.
Geoscience Australia has carried out both error budget analysis and limited field tests to verify the positional accuracy of the data. GEODATA TOPO 250K Series 3 data complies with the following statement of horizontal accuracy: "The summation of errors from all sources results in data with a standard deviation of 85 metres for well defined features". Alternative and equal ways of expressing this error are: Not more than 10% of well-defined points are in error by more than 140 metres; and, in the worst case, a well defined point is out of position by 300 metres. As the GEODATA TOPO 250K Series 3 data were digitised from existing map production material, some features may be subject to cartographic displacement.
For the TOPO 250K product, attribute accuracy is a measure of the degree to which the attribute values of features agree with the information on the source material. The allowable error in attribute accuracy ranges from 0.5% to 5%, at a 99% confidence level. Where less than 1% of attribute errors are permissible the entire population is tested. Where a less stringent limit is set for allowable errors a random subset of the relevant features in the tile is generally tested. The sample size is determined from statistical tables using the known population size of the relevant feature. Further information on the validation and testing methodology used by Geoscience Australia can be found in Appendix J of the Topographic Data and Map Specifications.
Validating logical consistency may involve tests to check that table and file names are set out as in the Data Dictionary. Also included are graphical tests which check such things as intersections, polygon closure, minimum sizes of polygons and topological relationships. The allowable error in logical consistency ranges from 0% to 5%. Further information on the validation and testing methodology used by Geoscience Australia can be found in Appendix J of the Topographic Data and Map Specifications.
All instances of a feature and its attribute values that appear on the source material are captured unless otherwise indicated in the selection criteria for that feature.
Contact Organisation: Department of Water
Position: GIS Support Analyst
Postal Address: PO Box K822
City: Perth
State: WA
Country: Australia
Postcode: 6842
Telephone: 08 6364 7412
Electronic Mail Address: spatial.data@water.wa.gov.au
13-06-2006