Terrestrial Groundwater Dependent Ecosystem (GDE) Density

dataset: GDE_TERR_DENSITY
This dataset is based on the Potential Terrestrial Groundwater Dependent Ecosystem (GDE) mapping undertaken by Dresel et al. (2010). Dresel et al. (2010) recognised that the dataset over estimated the occurrence of mapped terrestrial GDEs. For this reason, the GDE dataset was refined to provide information regarding the relative density of GDEs across the State. Areas of very low GDE density were assigned less weighting than an areas with very high GDE density GDE. This provided a suitable solution to the problem of mapped GDE over estimation.
 
Citation proposal Citation proposal
(2021)

Terrestrial Groundwater Dependent Ecosystem (GDE) Density

Department of Energy, Environment and Climate Action
 

Simple

 
 

Description

Title
Terrestrial Groundwater Dependent Ecosystem (GDE) Density 
Alternate title
GDE_TERR_DENSITY 
Purpose
The following classification has been applied: 0 = No Terrestrial GDE 1 = Low Density Terrestrial GDE 2 = Low-Medium Density Terrestrial GDE 3 = Medium Density Terrestrial GDE 4 = High Density Terrestrial GDE 
Supplemental Information
Related Documents: None For further information, see: Dresel PE, Clark R, Cheng X, Reid M, Terry A, Fawcett J and Cochrane D 2010, Mapping Terrestrial Groundwater Dependent Ecosystems: Method Development and Example Output, Department of Primary Industries, Melbourne, Victoria, 66 pp. 
Status
Completed  
 
 

Temporal

 
 

Spatial

Code
4283 
 
 

Maintenance

Maintenance and update frequency
As needed  
 
 

Format

Title
DIGITAL: ESRI ASCII GRID, JPEG2000 2 
 
 

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Keywords

Topic category
  • Inland waters
  • Biota
  • Geoscientific information
 
 

Resource Constraints

Use limitation
General 
Classification
Unclassified  
 
 

Lineage

Statement
Dataset Source: The original GDE dataset was produced by Dresel et al. (2010) in vector format. The vector dataset was converted to a 25m x 25m raster grid by intersecting the grid with the vector dataset and querying for the presence (= 1) or absence (= 0) of a mapped terrestrial GDE. This grid was aggregated up to 100 m x 100 m grid size (i.e. 16 smaller grids were combined to 1 large grid) and the density of terrestrial GDEs within this larger grid was calculated by the number of 25m x 25m grids that recorded the presence of a GDE through the previous step. The minimum density was 0 (i.e. 0 out of 16 smaller grids recorded a GDE within the larger grid) and the maximum density was 16 (i.e. 16 out of 16 smaller grids recorded a GDE within the larger grid). Density classification was undertaken using a 1km proximity radius. The cells that did not record a GDE were excluded prior to the density classification. The final GDE dataset has been classified as follows: 0 = No Terrestrial GDE 1 = Low Density Terrestrial GDE 2 = Low-Medium Density Terrestrial GDE 3 = Medium Density Terrestrial GDE 4 = High Density Terrestrial GDE Dataset Originality: Derived 
Description
Source description not available 
 
 

Metadata Constraints

Classification
Unclassified  
 
 

Quality

Attribute Quality
Comments
Not known 
Positional Accuracy
Comments
Not known 
Conceptual Consistency
Comments
Not known 
Missing Data
Comments
Victoria 
Excess Data
 
 

Acquisition Info

 
 

Raster Data Details

 
 

Point Cloud Data Details

 
 

Contour Data Details

 
 

Survey Details

 
 

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