Index of airborne geophysical surveys (National Geoscience Dataset)

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: ANZCW0703002380

Title: Index of airborne geophysical surveys (National Geoscience Dataset)

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Custodian

Custodian: Geoscience Australia

Jurisdiction: Australia

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The Geophysical Airborne Survey Index presents a summary of the essential specifications on over 800 airborne surveys held in the National Airborne Geophysical Database. Airborne magnetic and radiometric surveys have been flown by AGSO-Geoscience Australia since 1951 and continue today. Incorporated into the dataset are the details of surveys flown by the various State and Territory Geological Surveys as well as public domain company data. The digital and map data are available at a reduced cost of acquisition as an exploration tool to mineral and petroleum companies.

ANZLIC search words:

GEOSCIENCES
GEOSCIENCES Geophysics

Spatial domain:

locality map

Geographic extent name: AUSTRALIA EXCLUDING EXTERNAL TERRITORIES - AUS - Australia - Australia

Geographic extent polygon: 113 -9, 154 -9, 154 -44, 113 -44, 113 -9,

Note: The format for each Geographic extent name is: Name - Identifier - Category - Jurisdiction (as appropriate) See GEN Register

Geographic bounding box:: North bounding latitude: -9 °; South bounding latitude: -44 °; East bounding longitude: 154 °; West bounding longitude: 113 °

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Data currency

Beginning date: 1951-11-06

Ending date: 2001-07-18

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Dataset status

Progress: In Progress

Maintenance and update frequency: Not Known

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Access

Stored data format:: DIGITAL - mdb Microsoft Access database Access

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

Access constraints:

Free to download

Order Product

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Data quality

Lineage:

This is an information dataset giving specifications on airborne geophysical data available from Geoscience Australia, State and Territory Geological Surveys and public domain company data. Original data are extracted from the Airborne Geophysical Surveys database and converted to an Arcinfo dataset. Items feature and ufi are added to bring the dataset to current digital data standards.

The attributes for this dataset are compliant with Geoscience Australia's data dictionary, which can be viewed on-line at www.agso.gov.au/information/data_dictionary.html

More information on this dataset can be obtained from the following source :- Richardson, L.M. (compiler), 2001. "Index of Airborne Geophysical Surveys (Fifth Edition)". AGSO Record 2001/14, AGSO-Geoscience Australia.

Positional accuracy:

Nominal Scale 1:250,000

Before the introduction of GPS, radio-navigation beacons were used for navigation. Prior to radio-navigation the location of the aircraft was determined by comparing strip film or video recordings made of the ground during flight with aerial photography and topographic maps. In the latter case, an accuracy of the order of 150m was claimed for each of the points (called fixes) picked from the film/video record and located on topographic maps. Three to four fixes were determined at the start and end of each line and then at regular intervals along it. Intermediate points were infilled with additional naviagtional data recorded on the aircraft Doppler navigation system. With the advent of GPS positional accuracies of 15m are routine. Survey boundaries are accurately located using geodetic coordinates (longitude, latitude).

Attribute accuracy:

Either the Owner of the survey data or the Contractor that acquired the survey data supplied survey metadata attributes. Attributes are sourced from operational reports supplied by the Contractor or from documentation supplied by the Owner of the survey data. The attribute accuracy is only as accurate as he information supplied by the survey contractor or survey operator.

Logical Consistency:

The GIS package (Mapinfo) was used to detect errors in the spatial data structure. This check ensures that all survey polygons are closed and that each polygon is uniquely identified. A visual check of the survey metadata attributes is done prior to release.

Completeness:

886 surveys are contained in this database but only 624 have survey polygon information. Of the remaining 262, the concept of a survey polygon is not relevant as most of these entries in the metadata database refer to equipment calibration surveys, seismic line traverses or surveys flown in the 1950's and 1960s for which no reliable spatial information exists.

All surveys have the basic attributes known.

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