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Metadata : Gravity Grids of the Northern Territory |
Index:
Metadata Details:
Name:AS/NZS ISO 19115 Geographic Information - Metadata, ANZLIC Metadata Profile
Version:1.0
Date Metadata Extracted:2024-11-21
Date Metadata Last Updated:2020-11-23
Current URL (HTML format) : http://www.ntlis.nt.gov.au/metadata/export_data?type=html&metadata_id=FAD227C240E247A8E040CD9B214430D3
Current URL (XML format) : http://www.ntlis.nt.gov.au/metadata/export_data?type=xml&metadata_id=FAD227C240E247A8E040CD9B214430D3
Citation
ANZLIC Identifier:FAD227C240E247A8E040CD9B214430D3
Title: Gravity Grids of the Northern Territory
Citation Date:2007-03-01
Date Type:creation
Custodian:Department of Industry, Tourism and Trade
Description
Gravity grids of the Northern Territory consist of spherical cap Bouguer anomaly gravity and derived grids interpolated from a compilation of 218,155 ground gravity stations acquired by the Northern Territory Government, Commonwealth Government, and Industry since the 1950's. More than 75% of the Territory is covered by gravity stations at a spacing of 4km or better, with historical 11km spaced stations covering the remaining area. The Bouguer anomaly grids have been calculated using the AAGD07 formulae with a density value of 2670 kg/m3 and are presented in um/s2.
The input dataset, including longitude, latitude and spherical cap Bouguer anomaly, are provided as a comma separated text file as well as GIS files in MapInfo and ESRI format.
- geoscientificInformation
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:asNeeded
Data Currency Start Date:1964-01-20
Data Currency End Date:2020-08-14
Access Constraint:Copyright Northern Territory of Australia (Northern Territory Geological Survey) 2018
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:The Generic Mapping Tools gridding algorithm was used to create the base gravity grid. Derived products were created using intrepid Geophysics two dimensional Fourier filtering.
Five Grids are provided as follows:
1. The spherical cap Bouguer anomaly grid: NT_Gravity_2020_BA_GDA94DD_GRD.ers
2. The first vertical derivative of the spherical cap Bouguer anomaly grid: NT_Gravity_2020_BA_1VD_GDA94DD_GRD.ers
3. The spherical cap Bouguer anomaly grid with a first order polynomial trend removed: NT_Gravity_2020_BA_residual_GDA95DD_GRD.ers
4. The residual spherical cap Bouguer anomaly grid upward continued 250m: NT_Gravity_2020_BA_residual_UC250m_GDA94DD_GRD.ers
5. The first vertical derivative of the upward continued spherical cap Bouguer anomaly grid: NT_Gravity_2020_BA_UC250cm_1VD_GDA94DD_GRD.ers
The input datasets are provided with longitude, latitude and spherical cap Bouguer anomaly values as follows:
1. Comma separated text files:
NT_Gravity_2020_Pts_GDA94DD_CSV.csv
2. MapInfo format files:
NT_Gravity_2020_PTS_GDA94DD_TAB.DAT
NT_Gravity_2020_PTS_GDA94DD_TAB.ID
NT_Gravity_2020_PTS_GDA94DD_TAB.MAP
NT_Gravity_2020_PTS_GDA94DD_TAB.TAB
3. ESRI shape format files:
NT_Gravity_2020_PTS_GDA94DD_TAB.dbf
NT_Gravity_2020_PTS_GDA94DD_TAB.prj
NT_Gravity_2020_PTS_GDA94DD_TAB.shp
NT_Gravity_2020_PTS_GDA94DD_TAB.shx
Positional Accuracy:Accuracy of the height measurements can vary from centimetres to over 10m while spatial accuracy may vary from centimetres up to approximately 250m in the oldest data.
Older data is being progressively replaced. Spatial and height accuracy are generally in the centimetre range for modern (post 1990) surveys.
Attribute Accuracy:Not applicable
Logical Consistency:Not applicable
Completeness:Complete
Contacts
Name Organisation Position Role Phone Fax Manager Geophysics and Remote Sensing Department of Industry, Tourism and Trade Manager Geophysics and Remote Sensing custodian (08) 8999 6443 (08) 8999 6824 geoscience.info@nt.gov.au
Data Dictionary
No data dictionary defined for this dataset
Supplementary Information
Search Words: Geophysics, Gravity, Bouguer Anomaly, Northern Territory
This record maintained using the NTLIS Metadata Tool