 |
Metadata : Digital Elevation Model - Australia (Geodata 9 Second Dem -9's) |
Index:
Metadata Details:
Name:AS/NZS ISO 19115 Geographic Information - Metadata, ANZLIC Metadata Profile
Version:1.0
Date Metadata Extracted:2025-05-05
Date Metadata Last Updated:2000-01-14
Current URL (HTML format) : http://www.ntlis.nt.gov.au/metadata/export_data?type=html&metadata_id=2DBCB7711FC306B6E040CD9B0F274EFE
Current URL (XML format) : http://www.ntlis.nt.gov.au/metadata/export_data?type=xml&metadata_id=2DBCB7711FC306B6E040CD9B0F274EFE
Citation
ANZLIC Identifier:2DBCB7711FC306B6E040CD9B0F274EFE
Title:Digital Elevation Model - Australia (Geodata 9 Second Dem -9's)
Citation Date:2000-01-14
Date Type:publication
Custodian:Geoscience Australia
Description
Contains a national digital elevation model. The DEM has a grid spacing of nine seconds in latitude and longitude (approx 250 metres). Each value in the DEM represents the average elevation covered by the grid square. Produced in conjunction with the Australian Geological Survey Organisation (AGSO), the Australian Heritage Commission and the Centre for Resource and Environmental Studies at the Australian National University. The tiles are generally 6 degrees in longitude and 4 degrees in latitude.
The elevation points in this products are at an interval of 9 seconds of longitude and 9 seconds of latitude.
Access available only to eights tiles cover the entire Northern Territory and partly covers WA and SA from th NT border.
- biota
- environment
- geoscientificInformation
Bounding Coordinates:
- North Bounding Coordinate:-8.998547
- South Bounding Coordinate:-43.999005
- East Bounding Coordinate:154.001267
- West Bounding Coordinate:112.001285
Dataset Status
Dataset ID:ANZNT0001000060
Language:English
Character Set: Latin 1
Progress:completed
Maintenance and Update Frequency:notPlanned
Data Currency Start Date:1995-01-01
Data Currency End Date:1996-06-30
Access Constraint:The data are subject to Commonwealth of Australia Copyright. A licence agreement is required and a licence fee is also applicable. Please refer to the contact within this metadata.
Data Quality
Lineage:The DEM was derived using the following AUSLIG data:
- GEODATA TOPO-250K Relief theme which consists of more than 5 million spot elevations taken from contours or observed during 1:100 000 scale map production. (These points have an RMS of less than 10metres.)
- GEODATA TOPO-250K Hydrography theme. Watercourses and waterbodies from 1:250 000 scale mapping. Watercourses were flipped so that the sequence of points run in the direction of flow.
- Coastline derived from 1:250 000 scale mapping. AGSO provided elevation data from its national gravimetric database and its airborne geophysical surveys. The DEM was created using the ANUDEM algorithm developed by Dr Mike Hutchinson of the Australian National University. As well as using elevation data the program uses watercourses and large waterbodies to enforce hydrological accuracy, ie sinks which are often a problem in DEMs have been resolved by forcing
drainage where possible.
Positional Accuracy:The elevation given for each cell is, in effect, an estimate of the average elevation of the area covered by the cell. This generalisation results in a grid which can be considered as having a resolution between 1:250 000 and 1:500 000 scale.
The accuracy of the elevation value can be considered as being continuosly variable across the gridded area; average slope within a cell having the greatestinfluence. Theoretical considerations indicate a possible worst case of standard error of 35m and a maximum error of 90m when slope is 50%.
Attribute Accuracy:Not Relevant
Logical Consistency:Elevation values in the source data are correct coded.
Completeness:Australia
Contacts
Name Organisation Position Role Phone Fax AUSLIG (Australian Survey and Land Info Group) AUSLIG Data Sales custodian 02 6201 4340 02 6201 4381 datasales@auslig.gov.au
Data Dictionary
No data dictionary defined for this dataset
Supplementary Information
The data are held in the AGD66 coordinate system in decimal degrees. The elevations are based on the Australian Height Datum and are in metres to a precision of one cm. The Australian Spatial Data Directory(ASDD)
Also, further information about Spatial Metadata is at ANZLIC www.anzlic.org.au/metaelem.htm
This record maintained using the NTLIS Metadata Tool