Access AVAILABLE FORMAT TYPE(S) 1. Online Digital Data and Map Products through WetlandInfo and the Queensland Globe 2. Digital data available as a ESRI Shapefile, ESRI Geodatabase and ESRI Geodatabase Export download through QSpatial
Cit Resp Party
Queensland Herbarium, Department of Science, Information Technology and Innovation
Subterranean groundwater dependent ecosystems (GDE) areas
Additional human language abstract/description
Subterranean GDEs are ecosystems dependent on the subterranean presence of groundwater on a permanent or intermittent basis to meet all or some of their water requirements so as to maintain their communities of plants and animals, ecological processes and ecosystem services. Subterranean GDE area features include cave ecosystemsthat have some groundwater dependency. Information about the location and extent of known and potential GDEs was sourced from expert knowledge, literature and existing datasets. This dataset is one of five datasets that describe the distribution of known and potential GDEs across the landscape. The complete set of GDE datasets is: 1. Surface expression GDE points, 2. Surface expression GDE lines, 3. Surface expression GDE areas, 4. Terrestrial GDE areas, 5. Subterranean GDE areas. As the different types of GDEs represent different overlapping layers or cross-sections of the landscape, it is recommended that the datasets be mapped in the order of listing shown above (i.e. surface expression GDE points on top) to maintain logical consistency and assist visualization.
Version 1.0 (released October 2012) - mapping covers the whole of Queensland
Versions1.1 to 1.3 do not exist
Version 1.4(released December2015) - updated mapping covers the whole of Queensland and includes significant updates to attribution
Unrestricted to all levels of government and community. Dataset is available to all government agencies, community groups and individuals. Dataset is available through physical supply and may be made available via web delivery tools, for example, through the Queensland Department of Environment and Heritage Protection internet site.
Principal Project Officer, Wetlands
Queensland Department of Environment and Heritage Protection
This dataset reflects the level of knowledge and information about the landscape that may be biased due to a range of reasons such as accessibility and land use: It is likely that the dataset is incomplete. Detailed field survey and verification of the groundwater location, extent and fluctuation has not been done, nor has the level of ecosystem dependency on groundwater been tested.
Data quality report, measure description
The GDE attribution was sourced from local expert knowledge, literature and spatial data. The reliability of different attribute values may vary. Areas described as 'known' have been delineated according to local expert knowledge and generally have the highest level of confidence. Areas that are derived from a rule base, that make up the majority of the areas mapped, have been assigned a level of confidence according to judgment of the reliability of knowledge supporting the rule base.
Data quality report, measure description
The mapping linework is at a nominal scale of 1:100,000 and the accuracy associated with this is within the range +/-100 metres.
Layer: Queensland wetland data version 4 - wetland areas
Department of Science, Information Technology and Innovation
All polygons visually checked at 1:100,000 scale and by topological consistency checks. Inconsistencies between the water body classification and wetland regional ecosystem classification were highlighted, manually checked and reconciled.
Absolute External Positional Accuracy
The positional accuracy of wetland data mapped at a scale of 1:100 000 is +/-75 metres. The minimum polygon size depicted is 5 ha or 75 metres wide for linear features, except for areas along the east coast which are mapped at the 1:50 000 scale with a positional accuracy of +/-50 metres, with a minimum polygon size of 1 ha or 35 metres wide for linear features. Wetlands smaller than 1 ha are not delineated on the wetland data. NB: Consideration of the effects of mapped scale is necessary when interpreting data at a larger scale, (eg: 1:25,000).For property assessment, digital linework should be used as a guide only.For further details refer to Attachment 3 Scale of Final Wetlands Mapping located on the DSITIA website.
Non Quantitative Attribute Accuracy
Regional EcosystemsFormal and informal assessments show regional ecosystem attributes to be accurate > 80% of the time.Water BodiesFormal assessment of selected areas (EPA, 2005) has shown that the delineation of wetlands by the water body mapping to have an overall accuracy of between 93-98%. The producer's accuracy of non-wetlands (i.e. how accurately non-wetland areas are mapped and the user's accuracy for wetlands (i.e. how accurate areas mapped as wetland are wetland) is also consistently high ranging from 77-99%. The water body mapping does miss substantial areas of wetland, as the producer's accuracy for wetlands is relatively low ranging from 14-54%. However, as the wetland regional ecosystem data maps areas of wetlands that are not well mapped by the water body data, many of these areas are not missing from the wetlands data.
Lineage statement, a general explanation
Queensland Wetland Data Version 3.0 - Wetland Data (2009), is an updated version of data previously released as version 1.0 (GBR catchments), version 1.1 (Wide Bay Burnett catchments), version 1.2 (Great Barrier Reef, northern Cape York Peninsula and Queensland Murray Darling Basin), version 1.3 (Queensland, 2001 extent) and version 2.0 (Queensland, 2005 extent) , versions up to and including version 1.3 depicted extent of wetlands based on rectified 2001 Landsat ETM+ imagery, version 2.0 depicted extent of wetlands based on rectified 2005 Landsat ETM+ imagery . Version 3.0 updates the depiction of the extent of wetlands from 2005 to 2009 based on rectified 2009 Landsat ETM+ imagery.This data is produced by combining (by union) the wetland regional ecosystem areas with water body data. Where overlap occurred across water bodies and regional ecosystem polygons, water body polygons take priority over regional ecosystem polygons, except for areas within mangrove and salt flat regional ecosystems. The identification of individual water bodies is not useful within these regional ecosystems, due to the limitations associated with mapping water bodies from satellite imagery in tidal areas.