Authors / CoAuthors
Abstract
The GEBCO "One-Minute Grid" is based on the most recent version of the GEBCO Digital Atlas (GDA) bathymetric contours. Additional control contours and sounding data were used in many regions, particularly shallow water areas and semi-enclosed seas, to constrain the gridding process. It is a continuous digital terrain model for ocean and land, with land elevations derived from the Global Land One-km Base Elevation (GLOBE) database. As GA is only interested in the bathymetry in the Australian Region, the downloaded file was edited so that only the values in the Extents Box remained. The extract extends from 5°S to 80°S and from 45°E to 180°E. It must be stressed that although the GEBCO One Minute Grid is presented at one minute intervals of latitude and longitude, this does not imply that knowledge is available on sea floor depth at this resolution. It is important to note that, in most places, many miles exist between adjacent ship tracklines and that the grid is an interpolation based upon the input data. Further details of the data compilation and GEBCO grid construction are available from the 'User guide to the GEBCO One Minute Grid' ( http://www.bodc.ac.uk/data/online_delivery/gebco/documents/gridhelp.pdf).
Product Type
nonGeographicDataset
eCat Id
67181
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
- Australian and New Zealand Standard Research Classification (ANZSRC)
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- Marine Geoscience
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- Published_Internal
Publication Date
2008-07-14T00:00:00
Creation Date
Security Constraints
Legal Constraints
Status
Purpose
Maintenance Information
asNeeded
Topic Category
geoscientificInformation
Series Information
Lineage
The GEBCO Grid was first proposed in 1997. The construction of the grid used the latest available Gebco Digital Atlas (GDA) digitised contours as input and aimed to produce grid depths that would match these contours as closely as possible. The gridding was undertaken by various members of the SCDB Grid Working Group taking on the responsibility for making individual regional geids which were then merged to produce a global grid. Initailly the aim was to make a 5 min grid, but this was quickly altered to 2.5 min grid cell size to match other global datasets. Eventually the grid cell size was reduced to 1 min. In addition ist was decided that topography would also be included to produce a contiuous terrain model. Details of the process can be found in the document http://www.bodc.ac.uk/data/online_delivery/gebco/documents/gridhelp.pdf The GEBCO 1-minute Grid was downloaded from the NGDC web-site as an ASCII file and awk used to extract the portion suitable for the Australian Region.
Parent Information
Extents
[-80.0, -5.0, 45.0, 180.0]
Reference System
Spatial Resolution
Service Information
Associations
Downloads and Links
Source Information
Source data not available.