A bathymetric Digital Elevation Model (DEM) of the George V and Terre Adelie continental shelf and margin
Entry ID:
GVdem_2008
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Summary
Abstract:
This dataset comprises Digital Elevation Models (DEMs) of varying resolutions for the George V and Terre Adelie continental margin, derived by incorporating all available singlebeam and multibeam point depth data into ESRI ArcGIS grids. The purpose was to provide revised DEMs for Census of Antarctic Marine Life (CAML) researchers who required accurate, high-resolution depth models for correlating ... seabed biota data against the physical environment. The DEM processing method utilised all individual multibeam and singlebeam depth points converted to geographic xyz (long/lat/depth) ASCII files. In addition, an ArcGIS line shapefile of the East Antarctic coastline showing the grounding lines of coastal glaciers and floating ice shelves, was converted to a xyz ASCII file with 0 m as the depth value. Land elevation data utilised the Radarsat Antarctic Mapping Project (RAMP) 200 m DEM data converted to xyz ASCII data. All depth, land and coastline ASCII files were input to Fledermaus 3DEditor visualisation software for removal of noisy data. The cleaned point data were then binned into a gridded surface using Fledermaus DMagic software, resulting in a 0.001-arcdegree (~100 m) resolution DEM with holes where no input data exists. ArcGIS Topogrid software was used to interpolate across the holes to output a full-coverage DEM. ArcGIS was used to produce the additional 0.0025-arcdegree (~250 m) and 0.005-arcdegree (~500 m) resolution grids. Full processing details can be viewed in: Beaman, R.J., O'Brien, P.E., Post, A.L., De Santis, L., 2011. A new high-resolution bathymetry model for the Terre Adelie and George V continental margin, East Antarctica. Antarctic Science 23(1), 95-103. doi:10.1017/S095410201000074X 
Related URL
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Description:
Download point for the data - ArcInfo ascii file - Bathymetric DEM 138E-148E, 63S-69S, 0.001-arcdegree resolution (nominally 100 m)
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Geographic Coverage
(Click for Interactive Map)
Spatial coordinates
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N: -63.0
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S: -69.0
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E: 148.0
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W: 138.0
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Min Altitude:
0 M
Max Altitude:
2391 M
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Min Depth:
0 M
Max Depth:
4108 M
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Temporal Coverage
Start Date:
2008-03-17
Stop Date:
2010-07-16
Data Resolution
Latitude Resolution:
0.005 degrees
Longitude Resolution:
0.005 degrees
Quality
The various multibeam datasets were processed within acquisition software by the originating agencies in order to correct for sound velocity variations within the water column and the removal of noise. No account has been taken of tidal range, so all depth data is assumed to have a vertical datum of mean sea-level (MSL). The final DEMs conform to Order 2 of the International Hydrographic ... Organisation (IHO) Standards for Hydrographic Surveys Special Publication 44 - 5th Edition February 2008. Both Total Horizontal Uncertainty (THU) and Total Vertical Uncertainty (TVU) increase according to depth, so the maximum allowable THU is 30m up to 100m depth, 70m up to 500m depth, 120m up to 1000m depth, 220m up to 2000m depth, and so on. Realistically, however, the accuracy of GPS used for positioning during modern surveys is far better than the maximum allowable THU for Order 2 surveys, and so the THU figures quoted here are very conservative. The maximum allowable TVU is 2.5 m up to 100 m; 11.5 m up to 500 m depth; 23 m up to 1000 m depth; 46 m up to 2000 m depth and so on.
The data were last updated on May 11, 2011.
Access Constraints
The data are available for non-commercial use.
Use Constraints
This data set conforms to the PICCCBY Attribution License
(http://creativecommons.org/licenses/by/3.0/).
Users of the gvdem grid must include the following references in any subsequent publications using this dataset:
De Santis, L., Brancolini, G., Accettella, D., Cova, A., Caburlotto, A., Donda, F., Pelos, C., Zgur, F., Presti, M., 2007. New insights into ... submarine geomorphology and depositional processes along the George V Land continental slope and upper rise (East Antarctica). In: A.K. Cooper and C.R. Raymond (Editors), 10th International Symposium on Antarctic Earth Sciences, August 26-31 2007. Scientific Committee on Antarctic Research, Santa Barbara, U.S.A., pp. 1-5.
Beaman, R.J., O'Brien, P.E., Post, A.L., De Santis, L., 2011. A new high-resolution bathymetry model for the Terre Adelie and George V continental margin, East Antarctica. Antarctic Science 23(1), 95-103. doi:10.1017/S095410201000074X
This
"A bathymetric Digital Elevation Model (DEM) of the George V and Terre Adelie continental shelf and margin" is licensed under a Creative Commons Attribution 3.0 Unported License.
Data Set Progress
COMPLETE
Distribution
Distribution Media:
HTTP
Distribution Size:
193 MB
Distribution Format:
ArcInfo ascii
Fees:
Free
Distribution Media:
HTTP
Distribution Size:
34.3 MB
Distribution Format:
ArcInfo ascii
Fees:
Free
Distribution Media:
HTTP
Distribution Format:
ArcInfo ascii
Fees:
Free
Personnel
Role:
INVESTIGATOR
Role:
TECHNICAL CONTACT
Role:
DIF AUTHOR
Phone:
+61 7 4042 1693
Fax:
+61 7 4042 1284
Email:
robin.beaman at jcu.edu.au
Contact Address:
James Cook University PO Box 6811
City:
Cairns
Province or State:
QLD
Postal Code:
4870
Country:
Australia
Publications/References
Beaman, R.J., O'Brien, P.E., Post, A.L., De Santis, L. (2011), A new high-resolution bathymetry model for the Terre Adelie and George V continental margin, East Antarctica., Antarctic Science, 1, 23, 95-103, doi:doi:10.1017/S095410201000074X
Creation and Review Dates
DIF Creation Date:
2009-03-09
Last DIF Revision Date:
2011-05-17
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