Authors / CoAuthors
Sexton, M.J.
Abstract
bathymetric grid of the Heard Island-Kerguelen Plateau Region (Longitudes 68 E - 80 E, Latitudes 48 S - 56 S) is produced. In doing so, the individual datasets used have been closely examined and any deficiencies noted for further follow up or have been rectified immediately and the changes documented. These datasets include modern multibeam data, coastline data obtained from the World Vector Shoreline, echosounder data from research, fishing and Customs vessels and satellite derived bathymetric data. A hierarchical system was employed whereby the best and most extensive datasets were gridded first and applied as a mask to the next best dataset. A new masking grid would be formed from these datasets to pass non-overlapping data in the next best dataset. This procedure was employed until finally the satellite data were masked. All the various levels of masked data were then brought together by the gridding algorithm (Intrepid Desmond Fitzgerald Associates) and an ERMapper format grid produced. A grid cell size of 0.005? (nominal 500m) was used with many iterations of minimum curvature gridding and several passes of smoothing. The final grid is available in ERMapper, ArcInfo and ASCII xyz formats.
Product Type
nonGeographicDataset
eCat Id
66130
Contact for the resource
Custodian
Point of contact
Cnr Jerrabomberra Ave and Hindmarsh Dr GPO Box 378
Canberra
ACT
2601
Australia
Keywords
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- Marine MapBathymetry Map
- ( Theme )
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- marine
- Australian and New Zealand Standard Research Classification (ANZSRC)
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- Marine Geoscience
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- Published_Internal
Publication Date
2008-06-12T00:00:00
Creation Date
Security Constraints
Legal Constraints
Status
Purpose
Maintenance Information
asNeeded
Topic Category
geoscientificInformation
Series Information
Lineage
The grid is derived from data in Geoscience Australia databases and recent sources which will eventually be entered into those databases. One swath datasets acquired in 2004 was used but covers only a small area in the south-east of the region. An acceptable quality coastline of the islands in the region was obtained via the NGDC web-site. Thirty-three surveys from the G.A. MARDAT/OZMARII database, ranging in vintage from 1956 to 1999, and data from five ANARE years were incorporated into the gridding process. Finally satellite derived bathymetry from the SIO website was used to infill areas that had no higher quality observations within a nominal 10 kilometre radius.
Parent Information
Extents
[-56.0, -48.0, 68.0, 80.0]
Reference System
Spatial Resolution
Service Information
Associations
Downloads and Links
Source Information
Source data not available.