FAE2CAA9FD02B653E040CD9B2144242DEnglishManager Geoscience Business SystemsDepartment of Mining and EnergyManager Geoscience Business Systems(08) 8999 5448(08) 8999 6824geoscience.spatial@nt.gov.au2020-03-13AS/NZS ISO 19115 Geographic Information - Metadata, ANZLIC Metadata Profile1.0 Northern Territory Statewide Imagery - Digital Terrain Models (DTM)2000-01-01SRTM (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. 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 (https://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.English-26-111291382000-01-012007-12-31datasetnot knownSRTM data covers the entire NT with 80 m pixels, albeit missing some pixels in salt lakes and tidal flats. 0not knownNot Applicable0not knownThe 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.0not knownSRTM 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. 0SRTM 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