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Broken Hill - Menindee point located gravity dataNote: This metadata describes the dataset in accordance with the ANZLIC (Australia New Zealand Land Information Council) Core Metadata Guidelines Version 2. Dataset citationANZLIC unique identifier: ANZCW0703005321 Title: Broken Hill - Menindee point located gravity data CustodianCustodian: Geoscience Australia Jurisdiction: Australia DescriptionAbstract: The Broken Hill - Menindee point located gravity dataset contains 182 new gravity stations from a May 2003 gravity survey and 20,514 gravity stations from pre 2003 gravity surveys all located near Broken Hill in New South Wales. The pre 2003 gravity data come from existing data held in Geoscience Australia's National Gravity Database. These data are sourced from various surveys that in the past were commissioned by either Geoscience Australia, NSW Dept of Mineral Resources or private industry. All 20,696 gravity stations in this dataset have had terrain corrections calculated and are included in the data set. ANZLIC search words:
Spatial domain:
Geographic extent polygon: 141.24 -31.68, 141.84 -31.68, 141.84 -32.23, 141.24 -32.23, 141.24 -31.68,
Data currencyBeginning date: 2003-05-03 Ending date: 2003-05-11 Dataset statusProgress: Complete Maintenance and update frequency: Not Known Access
Access constraints: Licence required. You can purchase these data on CD-ROM from the Sales Centre through www.ga.gov.au/general/technotes/20011022_25.jsp. or download these data for free from the Onshore/Minerals downloads area : http://www.ga.gov.au/download/minerals.html Free Data DownloadData qualityLineage: This dataset release contains 20,696 point data values in the area extending from 31.68° S to -32.23° S and 141.24° E to 141.84° E. All data are provided in GDA94 coordinates. The parameters of the point located data are: Station spacing: various from 30 m to 2 km Projection: Geodetic in latitude and longitude Null value: blank Gravity Datum The gravity data as supplied are based on the IGSN71 datum and ISOGAL84 scale. The gravity unit used is micrometres per second squared. The height data are given in metres based on the Australian Height Datum (AHD). Gravity positions are given in datum GDA94. Positional accuracy: Highly variable depending on the age of the individual surveys that comprise this data set. Prior to 1995 (approximately), data were collected using various techniques such as manually scaling from base maps (100's m error), digitising from base maps derived from air photo station plots (100's m error), and using optical surveying methods (metre accuracy). More recent surveys were acquired using differential GPS with sub metre accuracy. Vertical accuracy is highly variable too, depending on the age of the survey. Prior to the use of differential GPS station heights were determined by picking off from a topographic map (10's metre error), using barometric techniques (metre errors) and optical surveying techniques (sub metre accuracy). Differential GPS gives centimetre accuracy. Attribute accuracy: Highly variable depending on the age of the individual surveys that comprise this dataset. Modern surveys using LaCoste & Romberg or Scintrex gravity meters have an accuracy of 0.01 µms-² (micro metres per second squared). Earlier surveys using older style quartz spring meters have a lower accuracy (~1.0 µms-²). Logical Consistency: A geoscientist visually inspected the finished dataset to make sure the data were accurate and consistent with current scientific information. Completeness: The dataset is complete. Contact information
Metadata informationMetadata date: 2013-03-08 Additional metadataMetadata reference XHTML: http://www.ga.gov.au/meta/ANZCW0703005321.html Metadata reference XML: http://www.ga.gov.au/meta/ANZCW0703005321.xml . Authors:Bacchin, M. |
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SPATIAL INFORMATION FOR THE NATION
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