Geoscience Australia: Global Digital Elevation Model (ETOPO2) - Australian Extract [DERIVED]  

Authors / CoAuthors

Abstract

The Global Digital Elevation Model (ETOPO2v2) represents gridded (2 minute by 2 minute) elevation and bathymetry for the world. Two versions of the grid exist, a cell centred version and a grid centred version. As the cell centred version (ETOPO2v2c) is considered to be the authoritative source, this version was used at GA to make the extract. As a result, the depth/elevation values are centred on intersections of lines of odd minutes of latitude and longitude. An extract of this dataset was made for use in the Australian Region. The extract extends from 5°S to 80°S and from 45°E to 180°E.

Product Type

nonGeographicDataset

eCat Id

67176

Contact for the resource

Keywords

• Marine MapBathymetry Map

Australian and New Zealand Standard Research Classification (ANZSRC)

• Marine Geoscience

• Published_Internal

Publication Date

2008-07-14T00:00:00

Creation Date

Security Constraints

Australian Government Security ClassificationSystem    

Classification - unclassified

Legal Constraints

Creative Commons Attribution 4.0 International Licence    

Access - restricted

Use - license

Status

Purpose

Maintenance Information

continual

Topic Category

geoscientificInformation

Series Information

Lineage

The ETOPO2 Model is produced from a number of data sources. In the Australian Region only two sources are relevant. Smith & Sandwell The "Smith & Sandwell" database is a worldwide set of 2-minute gridded ocean bathymetry derived from 1978 satellite radar altimetry of the sea surface. The version contained in ETOPO2v2 is 8.2. For a detailed technical discussion of their methodology, see http://www.ngdc.noaa.gov/mgg/bathymetry/predicted/explore.HTML Globe The "Global Land One-kilometer Base Elevation" (GLOBE) database is made up of data sets from more than eight US and foreign agencies. It covers all of the world's land masses at a resolution of 0.5 minute (30") of latitude and longitude, which is approximately one kilometer at the equator. GLOBE data were sampled to 2' cell averages for all land areas. More details can be found at http://www.ngdc.noaa.gov/mgg/topo/globe.html ETOPO2v2c was downloaded from the NGDC website 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.