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North Queensland geology 1:1 000 000 scale map

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


Dataset citation

ANZLIC unique identifier: ANZCW0703004166

Title: North Queensland geology 1:1 000 000 scale map


Custodian

Custodian: Geoscience Australia

Jurisdiction: Australia


Description

Abstract:

This digital dataset is a compilation of the best digital geological map data available in September 1996, drawn mostly from Department of Mines and Energy Queensland (DME) and AGSO published 1:100k, 1:250k, 1:1mil and 1:2.5mil scale geological maps, supplemented by Cainozoic geology from AGSO/Cape York Peninsula Land Use Strategy (CYPLUS) regolith landform and coastal zone maps. The 45 different map units reflect logical age/lithology groupings selected to provide a compromise between readability in hardcopy at 1:1mil scale and a useful amount of information. Internal boundaries of units grouped together were eliminated but the identity of mapped units within each polygon has been added to info tables.

The digital dataset was constructed as a basis for hardcopy map products - a 1:1mil scale geological map and a 1:3mil scale geological atlas to accompany AGSO Bulletin 240 - not as a digital product per se. Subsequently, in 2001, the dataset was upgraded to serve as part of a new 1:1mil scale outcrop geology map of Australia. This work comprised QA/QC of linework and attributes, and the addition of polygon constituent information.

ANZLIC search words:

  • GEOSCIENCES Geology Maps

Spatial domain:

locality map

Geographic extent polygon: 140.624 -9.844, 148.3 -9.844, 148.3 -20.844, 140.624 -20.844, 140.624 -9.844,

Geographic bounding box:
North bounding latitude: -9.844 °
South bounding latitude: -20.844 °
East bounding longitude: 148.3 °
West bounding longitude: 140.624 °

Data currency

Beginning date: 1996-01-01

Ending date: 2001-10-01


Dataset status

Progress: Complete

Maintenance and update frequency: Not Known


Access

Stored data format:
DIGITAL - ArcGIS-coverage ArcInfo coverage Geographic GDA94
NONDIGITAL - Map Printed map
Available format type:
NONDIGITAL - Map Printed map
DIGITAL - ArcGIS-coverage ArcInfo coverage Geographic GDA94

Access constraints:

Free to download

Order Product

Data quality

Lineage:

The first phase of the construction of this dataset, undertaken during 1996 and 1997, involved its compilation from a number of separate datasets. Most of the data was derived from post-1970 mapping (much of it at 1:100k scale, especially in the geologically complex eastern part of the map) published as second edition 1:250k scale geological series and special 1:250k regional map sheets. First edition (mostly pre-1970) 1:250k geological series maps were used in the geologically less-complex parts of the map. Some boundaries were derived from the digital version of the 1975 1:2.5mil scale Queensland Geology map. Cainozoic map unit boundaries in Cape York Peninsula north of 16 S are derived from AGSO/CYPLUS regolith landform and coastal zone maps. Additional information was derived from the 1:1mil scale Carpentaria-Karumba basins map, in the south-west part of the map, and the 1:500k scale Igneous Rocks of North Queensland maps. The compilation process involved a degree of generalisation of data and the absorption of smaller polygons into adjacent polygons. The compilation of the original dataset saw the removal of faults into their own dataset and the grouping of geological units into broader age-rock "groupings". The second phase, undertaken in 2001, involved the reintegration of faults into the geological dataset and the re-attribution of the original geological unit information. The reintegration of fault data into the coverage worked on the assumption that the location of the faults was more accurate than the corresponding 'geological boundary' linework in the geology coverage as the linework was not coincident. The re-attribution of geological unit information was done systematically from the separate "ungrouped" datasets used in the original process. The attribute accuracy of these datasets was checked against the sources used to create them and an exact list of those sources is provided in the Additional Metadata section.

Positional accuracy:

The original data were captured from data sources ranging from 1:100k scale through to 1:2.5mil scale. The finer scale data tends to be the result of more recent (post-1970) mapping tends to be in the more geological complex eastern part of the data. The coarser scale data tends to be the result of older (pre-1970) mapping tends to be in the south-western and geologically younger parts of the map, except for the Cainozoic coastal polygons north of 16 S, which were mapped at a finer scale. Despite this, and despite the fact that in a lot of areas the original 1:100k scale linework is intact there was a deal of generalisation of the data in the compilation phase and therefore the positional accuracy of the data can be considered to be accurate only at the map scale of 1:1mil.

Attribute accuracy:

The data were compiled from numerous geological maps and during the first phase of the creation of the dataset the polygons were merged into 45 distinct geological groupings based on rock type and age. During this first phase the data was compiled to be used at 1:1mil scale and therefore the accuracy of the polygons can be considered only to be accurate at this scale. For instance in the compilation processes the absorption of small polygons, particular younger sedimentary units, occurred. The accuracy of the attributes is also affected by the age of the source data. Those areas as described in the lineage section of pre-1970 age can be considered to be of lesser accuracy than the areas of more recent mapping.

In the second phase of the compilation of the data the original geological unit information was retrieved from the original 1:100k, 1:250k and miscellaneous other map sheets from which the data was compiled. All the polygon unit information was re-attributed. Where units inconsistent with the general description of the polygon are listed as present they represent small, unmapped areas of such rocks. For example a polygon representing Silurian felsic to mafic I-type intrusives (Si) may contain more than one such mapped unit as well as areas of Cainozoic sediment cover or even very minor country rock (such as Proterozoic Einasleigh Metamorphics) not shown at the map scale.

Logical Consistency:

Tests were done to ensure that the data are topologically consistent. Tests were done for data completeness, correct spatial representation and attribute accuracy. Although the validation procedure has not been subjected to rigorous statistical analysis it is intuitively estimated that fewer than 5% errors occur in those aspects of the data subject to validation.

Completeness:

The first phase of this dataset was the creation of a map of 45 broad geological groupings across the map area at 1:1mil scale. The dataset is as complete as the accuracy of original geological datasets. In the second phase of this dataset with the reintegration of the original geological unit information into the existing linework the data is again complete.


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

Metadata information

Metadata date: 2013-03-08


Additional metadata

Metadata reference XHTML: http://www.ga.gov.au/meta/ANZCW0703004166.html

Metadata reference XML: http://www.ga.gov.au/meta/ANZCW0703004166.xml

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Authors:Bain, J.H.C. Haipola, D
SPATIAL INFORMATION FOR THE NATION