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.

Source Data History: DEM receives seismic line location data from exploration companies as part of their statutory reporting requirements, from Government and Academic institutions and information collected by Office of Minerals and Energy...

Source Data History: DEM receives seismic line location data from exploration companies as part of their statutory reporting requirements, from Government and Academic institutions and information 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. 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. The survey areas were created from the outermost extent of inlines and crosslines which constitute the survey.
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: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:95% complete. Receipt of data is generally 3-6 months after a survey is completed.

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