Abstract

These data are a digital representation of information depicted on printed maps from the Australia 1:250, 000 Geological Series produced by AGSO and the Geological Survey of Western Australia (GSWA) between 1972 and 1982. The data are gridded according to the standard Australian 1:250, 000 sheet breakup. The complete dataset is comprised of the 4 1:250, 000 sheets covering marble Bar, Nullagine, Yarrie and Port Hedland in Western Australia. Data present include geological polygons (stratigraphic units), linear structural features (faults, dykes, folds, trends, lineaments etc). Polygons have a range of attributes extracted from each individual map including unit name, age and lithology, while lines and points are feature coded according to the AGSO publication Symbols Used On Geological Maps' (BMR 1989). A standard look-up table of AGSO geological codes and descriptions is available. Pilbara Data has gradually evolved from elementary 'CAD' quality data into its present topologically structured GIS format, and hence has many imperfections and inconsistencies. The spatial accuracy of data from some older maps is particularly problematical. Data has undergone only moderate checking. These map sheets were originally compiled on poor topographic bases. For a more accurate coverage of geology, use the adjusted digital version.
Google map showing geographic bounding box with values North bound -19.91 East bound 121.5 West bound 118.5 South bound -22.0
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please contact Geoscience Australia Client Services via:

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Product Type/Sub Type

dataset - GIS Dataset - 250K scale

Constraints

license
Creative Commons Attribution 3.0 Australia Licence

IP Owner

Commonwealth of Australia (Geoscience Australia)

Author(s)

Date (publication)

1998

Product Type

dataset

Topic Category

geoscientificInformation

Keywords

GIS Dataset
250K scale
geology
Earth Sciences

Resource Language

English

Resource Character Set

utf8

Resource Security Classification

unclassified

Geographic Extent

North bound
-19.91
East bound
121.5
West bound
118.5
South bound
-22.0

Lineage

Source maps: the geological maps are a depiction of information acquired from interpretation (mostly airphoto), field observation, and subsequent investigation (eg sample analysis for age and rock-type determination) . Some detail may have been generalised, repositioned, or omitted from the primary data for cartographic purposes. Maps were colkoiled from unrectified photo overlays onto topographic bases supplied by Australian Government mapping authorities. Drainage and, where necessary, other topographic features (eg fence lines) were used for spatial control of the geological data (see POSITIONAL ACCURACY). PILBARA Data: data were captured from stable-base repromat used in the production of the hardcopy multicolour geological maps. Initial acquisition was by high precision scanning. Resultant raster files were warped to fit digital graticules generated using Intergraph CAM software. Affine-'- warp was used, with the four corners of each tile forming tie points. Warped raster files were then vectorised and cleaned up using Abakos Provec and Scanfix software. Further interactive editing and additional capture of Doir-t data (via data heads-up digitising over the warped raster images) was carried out using MicroStation (V4.4.023) software. Data on some tiles were block shifted to account for datum/spheroid changes (See ADDITONAL METADATA for more information). MicroStation vector data were plotted and visually checked prior to conversion to IGISI format. No attribution was attached to the MicroStation data. MicroStation vector data were translated to Arc/Info coverage format using in-house scripts and ESRI's IGDSARC utility. Attribute fields were populated using information from the printed maps and coverages were built, checked and edited. The 60 individual 1:250, 000 sheets were then all put into one geology coverage, the duplicate frames were deleted and a new graticule was created in ARC to replace the frame arcs. Extra attributes were also added.

Digital Transfer Options

onLine

DISTRIBUTION Format

misc

Distributor

Role
distributor
Organisation Name
Geoscience Australia
City
Canberra
Administrative Area
ACT
Postal Code
2601
Country
Australia
Email Address

Metadata File Identifier

a05f7892-9937-7506-e044-00144fdd4fa6

Metadata Standard Name

ANZLIC Metadata Profile: An Australian/New Zealand Profile of AS/NZS ISO 19115:2005, Geographic information - Metadata

Metadata Standard Version

1.1

Metadata Date Stamp

1998-06-03

METADATA SECURITY CLASSIFICATION

unclassified

Metadata Contact

Role
pointOfContact
Organisation Name
Geoscience Australia
City
Canberra
Administrative Area
ACT
Postal Code
2601
Country
Australia
Email Address
Downloads
For information on acquiring this product,
please contact Geoscience Australia Client Services via:

fax:
+61 2 6249 9960; or
phone:
1800 800 173 (within Australia);
 
+61 2 6249 9966 (outside Australia).