Aerial magnetic surveys
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Data from geophysical surveys carried out by the British Geological Survey in many countries in the Middle East, the Indian sub-continent and Indo-China for different agencies. The surveys range from regional gravity and airborne magnetic mapping to targetted surveys for mineral and water. Individual surveys do not yet have metadata entries: this entry describes a notional database that represents all geophysical surveys carried out within the region.
Over 22000 km of corrected aeromagnetic total intensity data from various surveys in offshore petroleum areas in UK Continental Shelf and overseas collected to assist directional drilling. Line separation is 2 km and flight altitude is 80 m above sea level and navigation is by GPS (Global Positioning System). Some surveys have been bought or commissioned on an exclusive basis by BGS and can be used without further ado, others require permission sought from the aeromagnetic survey company or end-client.
Digitised version of aeromagnetic survey records of Great Britain comprising a record for each digitised point, supported by survey and 'ends and bends' based line indexes. Original records include flight line records, worksheets, contour sheets and air photos provided by contractors at completion of each survey. Worksheets digitised by BGS during 1980's Smith and Royles 1989.
Analogue aeromagnetic surveys of Great Britain for the Geological Survey (GSGB), subsequently digitised. Commercial Analogue survey of North Sea by Aerosurveys Inc, subsequently digitised by BGS. Commercial digital (+ one analogue) surveys off NW/N/NE of Britain by Huntings Geology and Geophysics and ESL, purchased outright by BGS. Local surveys, digital and analogue aeromagnetic (+ other methods) surveys for BGS and commercial companies. Data acquired over many years by different companies. Surveys vary from High Resolution helicopter covering a few square kms to regional surveys covering 1000s of square kms. Some data recorded analogue, subsequently digitised, other data full digital capture with GPS navigation. Approximately 75% of the bounding rectangle covered. Flight line separation varies between 2km and 0.4km, line spacing typically 2km over UK but 0.4km over Devon/Cornwall. Flight line separation for Aerosurveys/Huntings surveys vary between 6.4 to 15 km. Detailed surveys at various resolutions. Along line spacing varies, analogue data: digitised from 1:63 360 and 1:253 440 scale map sheets and digital surveys: Decca navigation, 305m asl (above sea level). Local helicopter surveys, analogue and digital recordings, various survey heights. HiRES survey, full digital data capture at 0.1 sec intervals, GPS navigation, 90m survey height.