To highlight the location and availability for download of processed seismic survey data.

To highlight the location and availability for download of processed seismic survey data.

Available SEG-Y data has been loaded, checked and validated against existing shotpoint location data to ensure compatibility with both data sets.(see notes below re quality of seismic shotpoint data base). PIRSA receives seismic line location data...

Available SEG-Y data has been loaded, checked and validated against existing shotpoint location data to ensure compatibility with both data sets.(see notes below re quality of seismic shotpoint data base). PIRSA receives seismic line location data from exploration companies as part of their statutory reporting requirements, from Government and Academic institutions collected by Office of Minerals and Energy Resources and its predecessors Data is received digitally in ASCII code and UKOOA format. The data files contain surveyed and/or interpolated seismic shotpoints which define the position of the seismic line. Shotpoint locations from some of the earliest surveys recorded during the 1950s, 1960s and 1970s were not available digitally and were digitised from best available maps. Prior to 1966, the spheroid in general use was Clarke 1858. Many of the surveys from this period were digitised from existing maps and were not converted to the datum currently in use, GDA94, and may therefore be in error by up to 200 metres. Processing Steps: Data received in digital form were checked and corrected as necessary before being committed to the database. The original shotpoint data were processed to filter out and reduce the number of points so that only those points required to define near-straight line segments are retained in the database.
Positional accuracy:The accuracy of the surveyed data is dependant on the survey techniques used to acquire the data and the quality of the horizontal and vertical control to which the seismic shotpoints were connected. The relative accuracy between points, rather than absolute accuracy, is the main criteria in seismic surveying methodology. The absolute accuracy is defined to be within the minimum specifications of (2.5*sqrt(kilometres length of line)) metres for horizontal accuracy and (10*sqrt(kilometres length of line)) centimetres for vertical accuracy. Generally, this accuracy is a factor of 5 times better than the minimum survey specifications. The relative accuracy between points is generally better than a couple of centimetres. The data is stored in the database to 1m precision. The original data is archived in its native format including the original precision which may be quoted to two decimal places.
Attribute accuracy:Attribute data pertaining to the processed data being offered has been sourced from header locations in the individual files and checked against the complimentary hard copy section in the PIRSA archives for that version and segment of line All attribute data is stored in the PEPS data base.. The seismic line and survey attributes are derived from operational survey reports. Validation checks are performed periodically, resulting in an estimated >95% accuracy. These checks include comparisons between reports from the spatial dataset and other supporting data.
Logical consistency:Highly consistent
Completeness:Digital processed seismic data is generally only available for seismic data recorded after 1975. Rarely are there any digital data prior to this date. Data presented here is only that which is "open file", i.e. it is greater than 2 years old. Ongoing management of this data set will be required to maintain currency as data becomes open file.

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