What are typical specifications for a regional airborne radiometric survey?
Regional airborne radiometric surveys in Victoria are conducted using either a helicopter or aeroplane. In mountainous areas a helicopter is used, flying at 80 m above the ground and following the terrain as closely as safety allows. The helicopter flies at speeds of 50 m/s (90 knots), recording a sample every 30-60 m along the flight path. Fixed wing aircraft are used where the terrain is flatter. The aeroplane flies at speeds of 70 m/s (130 knots), recording a sample every 50-80 m. Flight lines are usually 200 m apart in an east-west direction. The field of view of a spectrometer flying at 80 m height is about 150 m, so there is overlap of samples along the flight line, and small gaps between samples on adjacent flight lines. How are radiometric data displayed? Radiometric data are commonly displayed as a map, with colours representing sample values. The figure below illustrates how values collected along flight lines are transformed into a coloured map with 100% coverage of the area
Related Questions
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