Abstract

These data are a digital representation of information depicted on the printed map of the Millungera 1:250 000 Geological Series produced by AGSO and the Geological Survey of Queensland (GSQ) in 1972 (1st edition). Data present include geological polygons (litho-stratigraphic units), linear structural features (faults, dykes, folds, trends, lineaments etc), and point features (mines, structural points etc). Polygons have a range of attributes extracted from each individual map including unit name, age and lithological description, 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 associated descriptions is available (see ADDITIONAL METADATA). The data has gradually evolved from elementary CAD quality data into its present topologically structured GIS format, and hence has many imperfections and inconsistencies. Data has undergone rigorous validation and testing that includes over 80 different tests. See ADDITIONAL METADATA for more information on the data standards used.
Google map showing geographic bounding box with values North bound -19.0 East bound 142.5 West bound 141.0 South bound -20.0
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please contact Geoscience Australia Client Services via:

fax:
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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
dataset
geology
GIS
Earth Sciences

Resource Language

English

Resource Character Set

utf8

Resource Security Classification

unclassified

Geographic Extent

North bound
-19.0
East bound
142.5
West bound
141.0
South bound
-20.0

Lineage

Source: The geological maps are a depiction of information acquired from interpretation, field observation, and subsequent investigation. Some detail may have been generalised, re-positioned, or omitted from the primary data for cartographic purposes. Maps were compiled from unrectified photo overlays onto topographic bases supplied by the Commonwealth mapping authorities. Drainage and other topographic features were used for spatial control of the geological data. Data capture: Data were captured from stable-base repromat used in the production of the hardcopy multi-colour geological maps. Initial acquisition was by high precision scanning. Resultant raster files were warped to fit digital graticules. Affine-1 warp was used, with the four corners of each tile forming tie points. Warped raster files were vectorised and cleaned, followed by interactive editing and additional capture of point data (via data heads-up digitising). Vector data were plotted and visually checked prior to conversion to GIS format. Translation from MicroStation to ArcInfo format was facilitated using in-house scripts and IGDSARC utility. Attribute fields were populated using information from the printed maps. Coverages were built for topology, checked and edited. Upgrade: Data are unprojected from UTM projection into geodetic coordinate system. In addition, a datum-shift was performed from AGD66 to GDA94. Coverages were edge-matched with the surrounding tiles, where data was available. While, in general, features at the coverage boundaries matched, sometimes it was necessary to carry out limited interpretative work. Attributes were appended and existing modified as per specifications in the AGSO GIS Data Dictionary. Stratigraphic unit names were validated against records in AGSO's Stratigraphic Index database. Where superseded, they were replaced with the current names. Additional attributes, from the database, were added to all geological units with a known stratigraphic unit name.

Digital Transfer Options

onLine

DISTRIBUTION Format

shp
misc
mif
e00

Distributor

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

Metadata File Identifier

a05f7892-b456-7506-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

1999-06-21

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).