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Metadata : Northern Territory Statewide Imagery - Digital Terrain Models (DTM) |
Index:
Metadata Details:
Name:AS/NZS ISO 19115 Geographic Information - Metadata, ANZLIC Metadata Profile
Version:1.0
Date Metadata Extracted:2025-04-26
Date Metadata Last Updated:2020-03-13
Current URL (HTML format) : http://www.ntlis.nt.gov.au/metadata/export_data?type=html&metadata_id=FAE2CAA9FD02B653E040CD9B2144242D
Current URL (XML format) : http://www.ntlis.nt.gov.au/metadata/export_data?type=xml&metadata_id=FAE2CAA9FD02B653E040CD9B2144242D
Citation
ANZLIC Identifier:FAE2CAA9FD02B653E040CD9B2144242D
Title: Northern Territory Statewide Imagery - Digital Terrain Models (DTM)
Citation Date:2000-01-01
Date Type:creation
Custodian:Department of Industry, Tourism and Trade
Description
SRTM (Shuttle Radar Terrain Mission) data has been stitched together, edited and imaged to provide an elevation grid and an elevation image of the NT. A high passed version of the grid has been used to create a relief map of the NT.
- elevation
- geoscientificInformation
- imageryBaseMapsEarthCover
Bounding Coordinates:
- North Bounding Coordinate:-11
- South Bounding Coordinate:-26
- East Bounding Coordinate:138
- West Bounding Coordinate:129
Dataset Status
Dataset ID:
Language:English
Character Set: Latin 1
Progress:completed
Maintenance and Update Frequency:annually
Data Currency Start Date:2000-01-01
Data Currency End Date:2007-12-31
Access Constraint:Copyright Northern Territory of Australia (Northern Territory Geological Survey) 2020
With the exception of the Northern Territory of Australia logo, other government and corporate logos and where otherwise noted, all material in this publication is provided under a Creative Commons Attribution 4.0 International licence (creativecommons.org/licenses/by/4.0/legalcode).
You are free to re-use the work under the licence, on the condition that you attribute the Northern Territory of Australia (Northern Territory Geological Survey) and comply with the other licence terms.
Disclaimer: While all care has been taken to ensure that information contained in this publication is true and correct at the time of publication, changes in circumstances after the time of publication may impact on the accuracy of its information. The Northern Territory of Australia gives no warranty or assurance, and makes no representation as to the accuracy of any information or advice contained in this publication, or that it is suitable for your intended use. You should not rely upon information in this publication for the purpose of making any serious business or investment decisions without obtaining independent and/or professional advice in relation to your particular situation. The Northern Territory of Australia disclaims any liability or responsibility or duty of care towards any person for loss or damage caused by any use of, or reliance on the information contained in this publication.
Data Quality
Lineage:SRTM data was sourced from NASA website. Data was processed within NTGS to produce NT-wide geophysical grids and images. Images are periodically updated and re-processed.
The grid has been filtered to remove spikes, and holes darned over where specular reflection has left no data.
The coloured "elevation" image has been sun shaded from the northeast and equally-distributed assigned hues from the colour wheel between purple up to red.
The grey scale "relief" image is based on the elevation grid after it has been high-pass filtered in the Fourier domain to remove the longest wavelengths. Consequently only local changes in the elevation are displayed.
Previous versions of the state of elevation used the aircraft's radar altimeter on each survey to create an incomplete mosaic across the NT. Because the calculation of the elevation required GPS heights above the spheroid, the stitch lacked elevations from surveys collected before 1996.
In February 2000, SRTM collected radar elevations across the world, releasing the data over Australia in 2004. Comprehensively covering the NT, and sampling every 80 m, the SRTM data was chosen to supersede the aircraft elevation data to make elevation products
Positional Accuracy:The SRT Mission collected the data as a hologram, then during inversion, stretched the data across known benchmarks on the ground. NTGS has not identified any location errors due to SRTM relative to our own data.
Attribute Accuracy:SRTM Bibliography estimates the height accuracy to be 90% better than 8 m across Australia.
Radar " speckle" produces uncertainties of up to 5 m between adjacent pixels.
Logical Consistency:Not Applicable
Completeness:SRTM data covers the entire NT with 80 m pixels, albeit missing some pixels in salt lakes and tidal flats.
Contacts
Name Organisation Position Role Phone Fax Manager Geoscience Business Systems Department of Industry, Tourism and Trade Manager Geoscience Business Systems custodian (08) 8999 5448 (08) 8999 6824 geoscience.spatial@nt.gov.au
Data Dictionary
No data dictionary defined for this dataset
Supplementary Information
Search Words: SRTM, elevation, DTM, DEM, relief, geomorphology
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