Overview:
- IFR means In Field Referencing
- Used to dynamically measure the Earth’s magnetic vector
- Advantages are faster acquisition, area access and safer operations
IFR Measurement Methods
- Conventional Aeromag
- total field, inversion & downward continuation, wide area of data
- either off the shelf data or specially commissioned.
- Land IFR Survey
- robust, reliable but slow
- Dynamic Vector Survey
- in1998, the BGS, Shell and Tech 21 developed a method to directly measure the magnetic vector at sea.
- multiple evolutions of system – now at version 5.
- Helicopter IFR Method
- modified dynamic method in a helicopter
Advantages of Helicopter IFR Method
- Faster Acquisition
- Large areas can be covered in a matter of days rather than weeks
- Area Access
- No need for landowner permission to access. Also can fly close up to country borders
- Safer Operations
- Autonomous acquisition requires only the pilot to be in the helicopter
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View the entire Presentation:
Gerry Wiseman - IFR Survey Manager