Australian Geodata 9-Second DEM

Description

The Geodata 9-Second DEM for Australia provides gridded elevation data for the entire continent with a grid spacing of 9 arcseconds (roughly 250 meters). The DEM was created as a collaborative effort that involved the Australian Geological Survey Organization (AGSO), the Australian Surveying and Land Information Group (AUSLIG), the Australian Heritage Commission and the Center for Resource and Environmental Studies (CRES) at the Australian National University (ANU). Released in 1996, it was gridded from vector data using the ANUDEM algorithm to create a hydrologically consistent DEM. The DEM consists of 37 tiles which vary in size but many span roughly 6 degrees of longitude and 4 degrees of latitude. The tiles have been mosaicked by AGSO to create a color image product that has 16289 columns and 13897 rows. (Australia lies roughly between 110 to 155 degrees longitude, and -45 to -7 degrees latitude.) The data is distributed in both Gridded ASCII and XYZ (ASCII) formats and has elevation units of meters. Georeferencing is relative to the AGD66 (Australian National 1966) ellipsoid and the Australian Height Datum.

Data Source

Australian Surveying and Land Information Group (AUSLIG)

Data Availability

Tiles may be purchased from AUSLIG on CD-ROM. Current pricing depends on the number of users and is available online at the address listed below. Other AUSLIG DEMs with a grid spacing of 3 arcseconds are available for most populated regions in Australia.

Web Sites

Main Page: http://www.ga.gov.au/nmd/products/digidat/dem_9s.htm

Australia DEMs: http://www.ga.gov.au/nmd/products/digidat/dem.htm

Metadata: http://www.auslig.gov.au/meta/meta15.htm

Sample Data: http://www.ga.gov.au/download/nmd_download/samples.jsp

Index: http://www.ga.gov.au/nmd/products/digidat/images/index.gif

Geoscience Australia: http://www.ga.gov.au

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