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Index of airborne geophysical surveys (National Geoscience Dataset)Note : This dataset description is metadata (data about data) which describes the actual dataset in accordance with the ANZLIC (Australia New Zealand Land Information Council) Core Metadata Guidelines Version 2. Dataset citationANZLIC unique identifier: ANZCW0703002380Title: Index of airborne geophysical surveys (National Geoscience Dataset) CustodianCustodian: Geoscience AustraliaJurisdiction: Australia DescriptionAbstract: 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 and qualifiers:Geographic extent name: AUSTRALIA EXCLUDING EXTERNAL TERRITORIES - AUS - Australia Note: The format for each Geographic extent name is: Name - Identifier - Category - Jurisdiction (as appropriate) See GEN Register Geographic bounding box: Data currencyBeginning date: 1951-11-06Ending date: 2001-07-18 Dataset statusProgress: In ProgressMaintenance and update frequency: continual AccessStored data format:Available data format: Access constraints: Free to download Data qualityLineage: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. Contact informationContact organisation: Commonwealth of Australia (Geoscience Australia)Acronym: GA Position: Manager Client Services Address: Cnr Jerrabomberra Ave and Hindmarsh Dr Address: GPO Box 378 Suburn: Canberra State: ACT Country: Australia Postcode: 2601 Phone: 02 6249 9966 Fax: 02 6249 9960 Email: sales@ga.gov.au Metadata informationMetadata date: 2001-09-21 00:00:00.0Additional metadatafeature Feature type ufi Unique feature identifier (ufi) project unique survey id survey survey name data Geophysical data acquired (analogue and digital) in survey. Mag - total magnetic intensity, Rad - 4 channel gamma-ray, Elev - elevation, Rad-256ch - 256 channels of gamma-ray, FD_EM - frequency domain electromagnetics, TD_EM - time domain electromagnetics digital digital geophysical data available for a survey. type survey type crafttype type of aircraft used to collect the data start survey start date end survey end date operator The organisation which owns the survey data. This is from whom the data can be purchased minspacing minimum space between traverses in metres maxspacing maximum space between traverses in metres contractor The organisation which acquired the survey data processor The organisation which processed the survey data agl The height of acquisition above the ground surface in metres asl The height of acquisition above sea level in metres linekm actual distances flown in on-line data acquisition released date at which the data were available from the survey operator samplelint sample interval along line in metres lines total no of lines in survey direction The direction of the survey lines in degrees from true north xtalvol the volume of the gamma-ray spectometer downward looking crystals in litres upxtalvol the volume of the gamma-ray spectometer upward looking crystals in litres craftname The name or call-sign of the aircraft tiekm Tie km's flown in on-line acquisition totalkm Tot km flown in on-line acquisition area area of the actual survey in square km tiespacing The tie(cross-line) seperations in metresAuthors: Kilgour, B. , Richardson, L.M. This report was generated on 21 May 2013. |
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