Dataset TITLE
Laverton 1:250 000 Geology Second Edition (Version 2)

Dataset CUSTODIAN
Australian Geological Survey Organisation (AGSO)

Dataset JURISDICTION
Australia

Description ABSTRACT
Mapping of outcrop geology on Laverton SH51-2 1:250 000 map sheet in the 
Eastern Goldfields, Western Australia, undertaken 1989-1995 by M.B.Duggan,
P.R.Williams, E.A.Jagodzinski, M.Rattenbury, D.Champion, K.L.Currie,
D.H.Blake, A.J.Stewart, I.Bastrakova and J.Martyn & Associates, as part of 
the National Geoscience Mapping Accord (NGMA). 
Briefly, mapping consists of geological boundaries/units, faults, folds, 
veins, dykes, joints, linears, marker beds, trends, structural 
measurements, and mineral deposits.

Description SEARCH WORD(S)
GEOSCIENCES Geology
GEOSCIENCES Minerals

Description GEOGRAPHIC EXTENT NAME(S)
Laverton

Description GEOGRAPHIC EXTENT POLYGONS(S)
121.5, -29, 121.5, -28, 123, -28, 123, -29, 121.5, -29

Data Currency BEGINNING DATE
01JAN1985

Data Currency ENDING DATE
31DEC2001

Dataset Status PROGRESS
In Progress

Dataset Status MAINTENANCE AND UPDATE FREQUENCY
Irregular

Access STORED FORMATS
Digital/Non-Digital	Description
DIGITAL			Arc/Info version 8.0.2 SunOS, vector coverages, Universal Transverse Mercator projection, zone 51, Australian National Spheroid, Australian Geodetic Datum 1966

Access AVAILABLE FORMATS
Digital/Non-Digital	Description
DIGITAL			ARC/INFO vector coverages. UTM projection, Aust. National Spheroid, AGD66 Datum
NONDIGITAL			On Demand Paper Maps

Access ACCESS CONSTRAINT
Licence and fee required.

Data Quality LINEAGE
Geological and geophysical themes were generated from field observations
(1989-1995) and interpretation using aerial photographs (1:25 000 colour). 
Mineral deposit locations and information are largely sourced from the MINEDEX  
database (2000) maintained by GSWA. 
Topographic themes have been provided by AUSLIG and DOLA with agreement
that public release of any topographic data by AGSO will be in non digital 
form only. Some amendments to the topographic data have been made by the
authors.  Lineage of topographic data, prior to receipt from AUSLIG and DOLA,
is uncertain. Maps were compiled from unrectified photo overlays onto
topographic bases supplied by AUSLIG and DOLA (see notes on topographic 
data above). Drainage and, where necessary, other topographic features 
(eg fence lines) were used for spatial control of the geological data.
Compilations were digitally captured either by hand or automatically by 
scanning and vectorising procedures.  Point data with database origins have 
been located largely by non-differential GPS. Some detail may have been 
generalised, repositioned, or omitted from the primary data for cartographic 
purposes.

Data Quality POSITIONAL ACCURACY
The most prominent horizontal positional inaccuracy in this dataset has been
introduced during compilation to topographic base maps, and is estimated at
up to 300m.  The main source of error is inaccuracies in the location of 
topographic features on the base maps, which is compounded by insufficient 
topographic features in some areas of the base maps with which to accurately
align the photo overlays. Positional errors generated by distortions in the 
aerial photos and errors during the data capture process are difficult to 
quantify and are believed to be negligible in comparison to the topo base
error.
GPS located features, such as structural measurements, have an error of up 
to 100m due to selective availability imposed on GPS readings.

Data Quality ATTRIBUTE ACCURACY
The bulk of attributes in this data set are qualitative and quantitative 
geological observations and measurements.  Classifications of lithology and
linear geological features are largely interpretative, based on conventional
mapping techniques (field observations, photo/imagery interpretation, sample 
collection and analysis), and adhere to well established and standardised 
classification schemes.  Structural measurements are quantitative, measured
using standard field mapping instruments.

Data Quality LOGICAL CONSISTENCY
Rigorous quality control has ensured consistency in data structures and 
standards across the dataset.

Data Quality COMPLETENESS
The level of work undertaken to map the project area varies according to the nature of the geology.  Areas with large amounts of Precambrian outcrop have been mapped with numerous field observations, while those tracts of land with little or no Precambrian outcrop may have been mapped with few or no field observations.

Contact Information CONTACT ORGANISATION
Australian Geological Survey Organisation (AGSO)

Contact Information CONTACT POSITION
Manager, Information Management Branch

Contact Information MAIL ADDRESS 1
GPO Box 378

Contact Information MAIL ADDRESS 2


Contact Information SUBURB/PLACE/LOCALITY
Canberra City

Contact Information STATE/LOCALITY 2
ACT

Contact Information COUNTRY
Australia

Contact Information POSTCODE
2601

Contact Information TELEPHONE
02 6249 9496

Contact Information FACSIMILE
02 6249 9984

Contact Information ELECTRONIC MAIL ADDRESS
ian.odonnell@agso.gov.au

Metadata Date METADATA DATE
20FEB2001

Additional Metadata ADDITIONAL METADATA
There are some ASCII files containing additional metadata stored on the CD.
AGSO's GIS data dictionary can be viewed at  http://www.agso.gov.au/information/data_dictionary.html

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