Classified depth to water table for the Great Artesian Basin

Brief description

## **Abstract**

The dataset was derived by the Bioregional Assessment Programme from multiple source datasets. The source datasets are identified in the Lineage field in this metadata statement. The processes undertaken to produce this derived dataset are described in the History field in this metadata statement.



Categorised depth to groundwater in the Great Artesian Basin.

Categories are: (Depth indicated is meters below surface, surface elevation taken from 3 Second SRTM DEM-s)

1 = 0 - 5m

2 = 5 - 10m

3 = 10 - 15m

4 = 15 - 20m

5 = 20 - 25m

6 = 25 - 30m

7 = 30 - 35m

8 = 35 - 40m

9 = +40m

## **Dataset History**

Grid derived from subtracting the GAB waterlevel elevation surface from the GA 3second SRTM DEM-s



1. Depth to water table grid created using Raster Calculator. \\[GA 3sec SRTM DEM-s\\] - \\[GAB water table grid\\], Grid: float, produced.

2. QA/QC on float grid to remove values < 0 (water table above surface)

3. Artefacts still exist with high values up to 750m. This issue is resolved by classifying the grid (using the Spatial Analyst, Reclassify tool) into 5m intervals up to 40m than a final category of >40m. This final output is the available grid within this dataset.

## **Dataset Citation**

Bioregional Assessment Programme (XXXX) Classified depth to water table for the Great Artesian Basin. Bioregional Assessment Derived Dataset. Viewed 30 September 2016, http://data.bioregionalassessments.gov.au/dataset/6eabd9e1-0018-4314-bba4-87d5d1ebc8c3.

## **Dataset Ancestors**

* **Derived From** [Geoscience Australia, 3 second SRTM Digital Elevation Model (DEM) v01](https://data.gov.au/data/dataset/12e0731d-96dd-49cc-aa21-ebfd65a3f67a)

* **Derived From** [Water table elevation of the Great Artesian Basin (GABWRA)](https://data.gov.au/data/dataset/08f01dba-ec93-4c00-8e29-2b25a1948a33)

Full description

Classified depth to water table for the Great Artesian Basin - Data File