Topography - WaterCourses

Dataset Number903
Dataset TitleTopography - WaterCourses
CustodianData Authority: Department for Environment and Water
Data Provider: Department for Environment and Water

Description

DescriptionThe WaterCourses data set includes a broad selection of watercourses including drainage alignments not necessarily consisting of eroded beds or banks. Wide features are stored as polygons. Watercourses captured under larger scale mapping programs within restricted regions are stored in other layers. It is one of a collection of individual hydrographic data sets that are topologically structured and comprise point, line and polygon data types at a general capture scale of 1:50,000. It is used in a variety of applications, particularly in natural resource management, planning and development, and digital map publication.
UsageThrough the Commonwealth (Bureau of Meteorology) funded Australian Hydrological Geospatial Fabric (Geofabric) project 2011-2012, respective versions of surface water datasets from the former DFW and former DENR were integrated to create a single authoritative database. Data in pastoral regions of the State has been sourced from the Bureau of Meteorology (BoM) Geofabric Surface Cartography V2.1 AHGFMappedStream dataset (equivalent to Geoscience Australia's GEODATA TOPO 250K). The Geofabric data was integrated in June 2013.

Data Quality

LineageFeatures were originally captured by analog photogrammetric techniques based on 1:80 000 scale aerial photography and surveyed ground control for the standard 1:50 000 mapping program. The photogrammetric plot detail was hand traced onto stable film for map production. The reproduction material was subsequently scanned, the data vectorised and processed through standard procedures to clean,and code the data. The tile based data was processed, edge-matched and converted to GIS format. Watercourse features captured through larger scale mapping programs have been stored in other layers. Subsequently, features have been maintained by heads-up-digitising techniques within geographic regions determined by project requirements. Since the year 2000, update changes generally have not been verified in the field. Through the Commonwealth (Bureau of Meteorology) funded Australian Hydrological Geospatial Fabric (Geofabric) project 2011-2012, respective versions of surface water datasets from the former DFW and former DENR were integrated to create a single authoratative database. Data in pastoral regions of the State has been sourced from the Bureau of Meteorology (BoM) Geofabric Surface Cartography V2.1 AHGFMappedStream dataset (equivalent to Geoscience Australia's GEODATA TOPO 250K). The Geofabric data was integrated in June 2013.
CompletenessDataset is complete over its geographic extent; agricultural and pastoral areas (Whole of State)
Positional AccuracyFeatures sourced from the BoM Geofabric are generally within +/- 100 metres of their true position. Of the remaining data, 90% of well defined features are within +/- 25metres of their true position.

Geographic Extent

Extent NameSouth Australia
Min Easting or Longitude129
Min Northing or Latitude-38.25
Max Easting or Longitude141
Max Northing or Latitude-26

Dataset Status

Initially Acquired01-JAN-1990
Last UpdatedCURRENT
Update FrequencyQuarterly
Maintenance MethodUpdated on a regional basis by heads-up-digitising from orthophotography and integration of data from other sources.
AusGOALRestricted

Attributes

TableNameField AliasData TypeDescription
Topo.WaterCoursesFEATURECODE Long IntegerAS2482 based geographic feature code
Topo.WaterCoursesHYDROID Long IntegerFeature identifier, unique across all geodatabases within an AHGF release
Topo.WaterCoursesAHGFFEATURETYPE Long IntegerFeature type within the AHGF Data Model
Topo.WaterCoursesNAME textName associated with individual feature. If obtained from SA Gazetteer GAZRECNO is also populated
Topo.WaterCoursesHIERARCHY textImportance of associated watercourse (ie. Major, Minor)
Topo.WaterCoursesPERENNIALITY textPERENNIAL - inundated year round INTERMITTENT - inundated seasonally MAINLY DRY - periodic inundation, not seasonal
Topo.WaterCoursesAHGFPERENNIALITY textCode indicating the permanence of the associated water feature
Topo.WaterCoursesAUSHYDROID Long IntegerAusHydro identifier ¿ used to relate equivalent feature in AHGFNetworkStream
Topo.WaterCoursesNEXTDOWNID Long IntegerThe HydroID for the next downstream stream network segment
Topo.WaterCoursesENABLED short integerFlag indicating whether the feature is enabled or disabled in the logical network
Topo.WaterCoursesFLOWDIR Long IntegerCode for the direction of flow in relation to the digitised direction
Topo.WaterCoursesSOURCEFEATURECLASSNAME textFeature Class Name from the input data source
Topo.WaterCoursesSOURCEFEATURETYPE short integerFeature type from the input data source
Topo.WaterCoursesSOURCETYPE Long IntegerFeature sub-type (numeric code) from the input data source
Topo.WaterCoursesSOURCEID Long IntegerUnique identifier for individual feature in the input data source
Topo.WaterCoursesFEATURERELIABILITY DateReliability date of spatial object (Currency of reference source
Topo.WaterCoursesFEATURESOURCEAGENCY textName of agency that originally captured the attribute object
Topo.WaterCoursesATTRIBUTERELIABILTY DateReliability date of attribute object (Currency of the reference source
Topo.WaterCoursesATTRIBUTESOURCEAGENCY textName of agency that originally captured the attribute object
Topo.WaterCoursesPLANIMETRICACCURACY short integerStandard deviation of the horizontal positional accuracy in metres
Topo.WaterCoursesSYMBOL short integerSymbol number for feature used in Geoscience Australia¿s GEODATA product
Topo.WaterCoursesTEXTNOTE textText note to accompany the feature
Topo.WaterCoursesGEODESICLENGTH DoubleGeodesic length of feature calculated using Vincenty¿s Inverse Method (metres)
Topo.WaterCoursesGAZRECNO textSA Gazetteer record number for the feature name
Topo.WaterCoursesCAPTURESOURCE Long IntegerMetadata: Source mapping program
Topo.WaterCoursesCAPTUREMETHOD short integerMetadata: method of data capture (eg Trace ¿ Ortho Image)
Topo.WaterCoursesFEATURESOURCE short integerMetadata: information source used to identify feature
Topo.WaterCoursesSTREAMORDER Long IntegerStream order hierarchy number based on Strahler¿s system of ordering watercourses
Topo.WaterCoursesEDITDATE DateDate on which the spatial and/ or attribute object(s) of a feature were last edited

Contact Information

OrganisationDepartment for Environment and Water
Information
Postal AddressGPO Box 1047

ADELAIDE
SA 5001
EmailDEWNR.Mapland@sa.gov.au