North Pilbara Project Synthesis GIS.

Note: This metadata describes the dataset in accordance with the ANZLIC (Australia New Zealand Land Information Council) Core Metadata Guidelines Version 2.

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Dataset citation

ANZLIC unique identifier: ANZCW0703002927

Title: North Pilbara Project Synthesis GIS.

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Custodian

Custodian: Geoscience Australia

Jurisdiction: Australia

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The dataset presents the results of mapping of the North Pilbara region by AGSO under the National Geoscience Mapping Accord, and the Geological Survey of Western Australia. The dataset includes polygon and line layers depicting outcropping and buried rock types and structures. It also includes point layers depicting outcrop descriptions; mineral occurrences; and geochronological data . The dataset also includes images, (both original and derivative) from magnetics, topography, gravity, radiometrics, and remote sensing. See README.TXT file for a more comprehensive listing.

ANZLIC search words:

GEOSCIENCES Geology Mapping

Spatial domain:

locality map

Geographic extent polygon: 116 -20, 121 -20, 121 -22.2, 116 -22.2, 116 -20,

Geographic bounding box:: North bounding latitude: -20 °; South bounding latitude: -22.2 °; East bounding longitude: 121 °; West bounding longitude: 116 °

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Data currency

Beginning date: 1997-01-01

Ending date: 2000-06-30

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Dataset status

Progress: Complete

Maintenance and update frequency: Not Known

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Access

Stored data format:: DIGITAL - bil Band interleaved by line (BIL) image Lambert Conformal Conic WGS84; DIGITAL - ArcGIS-coverage ArcInfo coverage Geographic WGS84; DIGITAL - shp ArcView shape file ArcView Geographic WGS84; DIGITAL - dat Data file MapInfo Geographic WGS84

Available format type:: DIGITAL - shp ArcView shape file ArcView Geographic WGS84; DIGITAL - dat Data file MapInfo Geographic WGS84; DIGITAL - ArcGIS-coverage ArcInfo coverage Geographic WGS84

Access constraints:

Licence required.

Free Data Download

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Data quality

Lineage:

Geological mapping was compiled through integration of field mapping, aerial photograph interpretation, 400m line spaced airborne geophysics (magnetics and radiometrics), university studies and open file company reports. Mapping was scanned and digitised in Intergraph Microstation and Arc/Info from compilation sheets compiled on to topographic film bases. Digital map editing was performed using Arc/Info. Images were obtained from AGSO's corporate national datasets with specifications listed in the readme.txt file:

Magnetics Digital Terrain Model Images

Obtained from geophysical airborne surveys with 400 metre flight-line spacing, terrain clearance 80 m, AGSO Surveys P649, P651, P656.

Gravity Images

Gravity data is from a grid with 5 and 11 km spacing. Software used: Intrepid for data reduction and griding, and ERmapper for final grid display.

Radiometrics Image

Data from geophysical airborne surveys with 400 m flight-line spacing, terrain clearance 80 m, AGSO surveys P649, P651, P656. Software used: Intrepid for data reduction and griding, and ERmapper for grid manipulation and display. Original Radiometrics data was then equalised to give the best representation of the data.

Positional accuracy:

Vector data

It should be noted that, due to poor topographic bases, an adjustment was carried out of the original outcrop geology. This adjustment was primarily carried out with the aid of Landsat -5 TM imagery. Cross-checking with this imagery, it can be estimated that about 95% of all features could be expected to have an accuracy of about 150 metres.

Image data

Some field analysis of the positional accuracy of features has been undertaken, however intuitively it is considered that about 95% of all features are within 3 pixels of their true position (see README.TXT file for individual information on pixel sizes.

Attribute accuracy:

Attribute accuracy is high for all vector layers and images.

Logical Consistency:

Vectors

Data layers fall into three feature groups: polygons, lines, and points. All lines, points and polygons in all layers are labelled and fully attributed. All care has been taken to ensure that all lines intersect at nodes, no duplicate lines exist and all polygons are closed with no duplicate labels. Geological faults and dykes exist as dangling lines (overshoots) in polygon layers.

Completeness:

Data and basic descriptive attributes are complete. Some attributes, such as UNITNAME and STRATNO in the solid geology layer, are not fully populated as some units do not have formal names. All images, with the exception of the spectrometric derivative layers, are complete for the area of 116 degrees east to 121 degrees east, and 20 degrees south to 22.5 degrees south. Spectrometric images only extend south to 22 degrees.

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Contact information

Contact organisation: Commonwealth of Australia (Geoscience Australia) (GA)
Contact position: Manager Client Services
Mail address: Cnr Jerrabomberra Ave and Hindmarsh Dr
Mail address: GPO Box 378
Locality: Canberra
State: ACT
Country: Australia
Postcode: 2601
Telephone: 02 6249 9966
Facsimile: 02 6249 9960
Electronic mail address: sales@ga.gov.au

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Metadata information

Metadata date: 2013-03-08

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Additional metadata

Metadata reference XHTML: http://www.ga.gov.au/meta/ANZCW0703002927.html

Metadata reference XML: http://www.ga.gov.au/meta/ANZCW0703002927.xml

Refer to README.TXT file with the data package for detailed descriptions of data layers.

Authors:Ratajkoski, M. Blewett, R.S. Wellman, P. Huston, D.H

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