| Reliant on subsurface groundwater (vegetation) | |
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Data format: File Geodatabase Feature Class File or table name: GDE SUBSURFACE Coordinate system: Geographic Theme keywords: groundwater dependent ecosystem, hydrogeology, Australia, subsurface, vegetation |
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Abstract:
The data set expresses the potential for groundwater interaction/use of vegetation ecosystems across Australia. It shows the ecosystems that use groundwater from beneath the watertable or in the capillary zone. The dataset was created by analysing all vegetation polygons contained in existing maps, and the outcome of the analysis identified which of those polygons were potentially interacting with groundwater. The analysis initially identified vegetation polygons that were using another water source in addition to rainfall using remote sensing (MODIS and Landsat) data. These ecosystems are known as IDEs. The IDEs were then analysed further to determine whether the additional water source was likely to be groundwater, soil water or surface water. Where this additional information enabled a conclusion to be made on the potential of each vegetation IDE to be using groundwater, the ecosystem was included in the GDE layer ('Reliant on subsurface groundwater') and categorised as having either a high, moderate or low potential for groundwater interaction. |
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Metadata elements shown with blue text are defined in the International Organization for Standardization's (ISO) document 19115 Geographic Information - Metadata. .Elements shown with green text are defined by ESRI and will be documented as extentions to the ISO 19115.
The data set expresses the potential for groundwater interaction/use of vegetation ecosystems across Australia. It shows the ecosystems that use groundwater from beneath the watertable or in the capillary zone. The dataset was created by analysing all vegetation polygons contained in existing maps, and the outcome of the analysis identified which of those polygons were potentially interacting with groundwater. The analysis initially identified vegetation polygons that were using another water source in addition to rainfall using remote sensing (MODIS and Landsat) data. These ecosystems are known as IDEs. The IDEs were then analysed further to determine whether the additional water source was likely to be groundwater, soil water or surface water. Where this additional information enabled a conclusion to be made on the potential of each vegetation IDE to be using groundwater, the ecosystem was included in the GDE layer ('Reliant on subsurface groundwater') and categorised as having either a high, moderate or low potential for groundwater interaction.
The purpose of this layer is to show all GDEs that rely on the subsurface presence of groundwater across Australia. The layer is one of the primary outputs of the National Water Commission's GDE Atlas and is intended to assist in management and allocation of groundwater resources.
The limitation is that the scale and resolution of the mapped information is only as detailed as the input mapping used; ecosystems that are not mapped in existing vegetation mapping will not appear in the layer; where there is no vegetation mapping available, there can be no mapping of GDEs that are reliant on subsurface presence of groundwater; the data is dependent on the time period of the data used and GDEs can only be identified if active in the time period; it does not provide information on the future or the past.
publication date
National Water Commission or National Water Commission's nominated agency.
95 Northbourne Ave
Polygons are represented as potential for groundwater interaction/use, by the categories high, moderate and low potential. Attributes are populated from existing literature describing GDEs or previously existing spatial datasets.
All spatial topology have been checked using ARC/INFO software.
Features have been mapped where data has been made available to the project.
Accuracy dependent on input data.
DAFWA, NSW DECCW, NSW GOV, NSW National Parks and Wildlife Service, NT NRETAS, Qld DERM, SA Dept of Environment and Natural Resources, Tas DPIWE, Vic Dept of Primary Industries, Vic Dept of Sustainability and Environment
Ecosystem mapping was used to provide the linework which delineates vegetation ecosystems. Remote sensing data was applied to each ecosystem during the analysis. Other previously existing GIS data was also applied to the vegetation ecosystems. Together the data enable calculation of the potential for groundwater interaction/use.
Internal feature number.
ESRI
Feature geometry.
ESRI
Length of feature in internal units.
ESRI
Area of feature in internal units squared.
ESRI
95 Northbourne Ave