Open Data

SHP

1

Resource Access Level

&copy State of Queensland (Department of Environment and Heritage Protection) 2015

This material is licensed under a <a rel="license" href=" http://creativecommons.org/licenses/by/3.0/au/">Creative Commons - Attribution 3.0 Australia</a> licence.<br /> <a rel="license" href=" http://creativecommons.org/licenses/by/3.0/au/"><img alt="Creative Commons License" title="Creative Commons - Attribution 3.0 Australia License" style="border: 0;" src=" http://i.creativecommons.org/l/by/3.0/au/88x31.png" /></a><br /> The Department of Environment and Heritage Protection requests attribution in the following manner:<br /> &copy; State of Queensland (Department of Environment and Heritage Protection) 2015.

eng

Open Data

Tiles of raw 1-2km2 LAS and XYZ file were collected and multiple tiles went through a TIN process in the software package Quick Terrain Modeller, which converts merged LAS files to 5m resolution Tiffs. The Tiff files were then merged in ArcGIS in a process,"mosaic to new raster", to produce a regional Australian Height Datum (AHD) DEM.

To get the appropriate levels required for coastal hazard data, the AHD DEM was subtracted against a raster, which was converted from a polygon, that had various current HAT levels enclosed in boundaries ranging all up the coast from the 2010 tide tables. This created a Highest Astronomical Tide (HAT) DEM

Because all predicted sea level rise figures and storm tide values were related back to current HAT (e.g. IPCC sea level rise: 0.8m above current HAT), a reclassify on the HAT DEM to that particular level was performed and then converted to a polygon. A process to "clean" the polygons so it relates to the coastal hydrology was performed to achieve each coastal hazard level. This involved the use of a data set ranging from marine to estuarine extents in which coastal hazard polygon data intersecting the data set was included. Coastal hazard data that was 40m from the intersecting data was also included. The data was then aggregated in ArcGIS to reduce the noise of the data by joining polygons together.

Limitations with the QTM and ArcGIS software were observed where there was a limit to the size and shape of the LAS file data and this increased the time to produce the AHD DEM models. Also the AHD DEM models were not hydrologically corrected as, in the opinion of project staff, there were not any drainage data sets with high enough resolution that would be able to perform an accurate determination of hydrological flow. Also, given the size of the DEMS and the time limits, the process to hydrologically correct the regional AHD DEM models would not be viable. This may be reconsidered in future releases of the data.

eng

ISO 19115:2005, ANZLIC ISO 1.1

Minimum Validation