The gbr100 dataset is a high-resolution bathymetry and Digital Elevation Model (DEM) covering the Great Barrier Reef, Coral Sea and neighbouring Queensland coastline. This DEM has a grid pixel size of 0.001-arc degrees (~100m) with a horizontal datum of WGS84 and a vertical datum of Mean Sea Level (MSL).
This dataset was developed as part of the 3DGBR project.
This grid utilises the latest available multibeam, singlebeam, lidar and satellite bathymetry source datasets provided by Federal and State Government agencies, in addition to significant new multibeam data collected during research expeditions in the area.
The large increase in source bathymetry data added much detail to improving the resolution of the current Australian Bathymetry and Topography Grid (Whiteway, 2009). The gbr100 grid provides new insights into the detailed geomorphic shape and spatial relationships between adjacent seabed features.
The accompanying report contains an explanation of the various source datasets used in the development of the new grid, and how the data were treated in order to convert to a similar file format with common horizontal (WGS84) and vertical (mean sea level) datums. Descriptive statistics are presented to show the relative proportion of source data used in the new grid. The report continues with a detailed explanation of the pre-processing and gridding process methodology used to develop the grid. A description is also provided for additional spatial analysis on the new grid in order to derive associated grids and layers.
Formats: 19000x18000 pixel grid (32 bit float) in ESRI raster grid file, GMT/netCDF grid file, Fledermaus sd file, 100m contour ESRI shapefile, GeoTiff grid file.
Total Vertical Uncertainty: Total Vertical Uncertainty (TVU) in the bathymetry estimated from uncertainty classification of each source dataset.
Formats: 19000x18000 pixel grid (32 bit float) in ESRI raster, GeoTiff.
Hillshading: Hillshading for full gbr100 and also ocean areas only. Derived from the gbr100 grid.
Format: 19000x18000 pixel grid (8 bit) in GeoTiff.
This dataset was initially developed as part of project 2.5i.1 from the MTSRF program (2010).
Subsequent versions of the dataset were developed from other funding sources.
This version incorporates dozens of new bathymetric surveys including many new navy LADS surveys and some satellite derived bathy to fill in some gaps left by LADS.
This version incorporates estimates of bathymetry from satellite imagery in shallow clear waters.
To visualize this dataset on the eAtlas the format of the data was converted from the ESRI ArcInfo grid format into a GeoTiff format. This was done by loading the data in ArcMap then exporting it as a GeoTiff image. Overview images and final compression options were then performed using GDAL tools.
Oceans | Bathymetry | Seafloor Topography, Land Surface | Topography | Terrain Elevation, Oceans | Coastal Processes | Coastal Elevation (theme).
Certain material in this product is reproduced under licence by permission of The Australian Hydrographic Service.
© Commonwealth of Australia 2010. All rights reserved.
Queensland, Great Barrier Reef and Coral Sea. See Appendix in accompanying report for data temporal extent.
Project 2.5i.1a final report outlining the development of the gbr100 grid.
Full description of the 3DGBR project.
Title: GBR Bathymetry gbr100 (JCU) Description: This layer shows the topography of the Queensland coast and the bathymetry of the Great Barrier Reef and the Coral Sea. This uses version 4 of the gbr100 dataset based on the GeoTiff version of the dataset.
The gbr100 DEM was compiled from a number of source datasets including the Australian Bathymetry and Topography Grid (Geoscience Australia, 2009), multibeam data (Geoscience Australia, Australian Hydrographic Service), singlebeam (Geoscience Australia), lidar (Royal AUstralian Navy), coastline data (Geoscience Australia), satellite elevation data from the Shuttle Radar Topographic Mission (NASA). See the final report for full details.
AUSTRALIAN HYDROGRAPHIC SERVICE NOTICE: Not to be used for navigation. Certain material in this product are reproduced under licence by permission of The Australian Hydrographic Service © Commonwealth of Australia 2010. All rights reserved. This information may not be copied, reproduced, translated, or reduced to any electronic medium or machine readable form, in whole or part, without the prior written consent of the Australian Hydrographic Service.
GEOSCIENCE AUSTRALIA NOTICE: This gbr100 DEM incorporates data which are © Commonwealth of Australia (Geoscience Australia) 2010. The Commonwealth gives no warranty regarding the data's accuracy, completeness, currency or suitability for any particular purpose.
This dataset has been compiled from a wide range of data sources of varying resolution and accuracy. The resulting gbr100 DEM has some reefs shifted by up to 500m in the Swain Reefs area, due to a lack of source bathymetry data.