High-amplitude, short-wavelength culture-related magnetic anomalies can adversely impact the processing and interpretation of aeromagnetic surveys. Since cultural features (man-made objects) are surface or near-surface, the problem is especially acute for modern HRAM (high resolution) surveys flown with low terrain clearance and close line spacing. Because of the low terrain clearance, the sensor- source separation is relatively short and the signal fall-off (inverse square or inverse cube) from a monopole/dipole-type culture source is unfavorably low. That means undesirable anomalies (magnetic noise) remain strong.
After completing this unit, you will:
- Understand the meaning of culture-generated anomalies and “culture-editing” (or “de-culturing”).
- Know when and why to do culture-editing of aeromagnetic data.
- Understand some of the pitfalls of the culture-editing process.
- Understand how culture-editing will improve the quality of your magnetic data base and lead to more accurate interpretations.
- Be able to better relate this subject with Modules 15, 18, 19 and 26.