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                <gco:DateTime>2018-06-06T04:32:09</gco:DateTime>
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                        <gco:CharacterString>HUN GW modelling DEM v01</gco:CharacterString>
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                <gco:CharacterString>## **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. 


This dataset contains the following:


HUN_GW_modelling_DEM.txt - an xyz textfile of 90m resolution elevations for the Hunter GW modelling domain.


HUN_GW_Model_topography.gdb - an ESRI file geodatabase containing interim rasters used to create the DEM which was exported to the above xyz textfile. The rasters contained are:


1 HUN_GW_Model_Bathy90 - extract from the source bathymetry layer resampled and reprojected to MGA z56 90m

2 HUN_GW_Model_SRTM90 -   extract from the source 3sec SRTM layer resampled and reprojected to MGA z56 90m

3 HUN_Offshore_Bathy90 - (1) above clipped to areas where (2) has cellvalue of 0 (ie SRTM offshore area)

4 HUN_SRTM_Bathy90m_mosaic - (2) with offshore area replaced with (3)

5 HUN_GW_SRTM_Bathy90m_mosaic -  (4) clipped to GW model domain

## **Purpose** 

Input for groundwater modelling for Hunter subregion.

## **Dataset History** 

Rectangular extract (encompassing hunter rectagular extent plus some additional offshore area) of source bathymery and SRTM elevation rasters were resampled and reprojected to congruent 90m cell resolution MGA zone 54 rasters.


The cell values of the offshore area of the SRTM (ie where cellvalue = 0 or nodata) were replaced with those of the 90m bathymety data to create a seamless mosiac of SRTM elevations on land and bathymetry elevations offshore.


This was then clipped to the GW modelling domain and the raster exported as an xyz acii file.

## **Dataset Citation** 

Bioregional Assessment Programme (2014) HUN GW modelling DEM v01. Bioregional Assessment Derived Dataset. Viewed 22 June 2018, http://data.bioregionalassessments.gov.au/dataset/f0927e8a-cc41-419b-ae68-660d5d5fa47b.

## **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** [Australian Coal Basins](https://data.gov.au/data/dataset/9d5a8d74-a201-42bd-9d49-3c392244be16)

* **Derived From** [Hunter Groundwater Model extent](https://data.gov.au/data/dataset/6d4a8c97-f7ea-4840-9de9-af6f7b18b8d6)

* **Derived From** [Bathymetry GA 2009 9sec v4](https://data.gov.au/data/dataset/60fb8bf5-b97d-49c9-b7fb-e7d594d2c75b)

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                        <gco:CharacterString>Hunter subregion</gco:CharacterString>
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