AGL	Above ground level
CC	Correlation coefficient
CEEMDAN	Complete ensemble empirical mode decomposition with adaptive noise
EEMD	Ensemble empirical mode decomposition
EMD	Empirical mode decomposition
IGRF	International Geomagnetic Reference Field
IMF	Intrinsic mode function
OPMs	Optically pumped magnetometers
PE	Permutation entropy
PSNR	Peak signal-to-noise ratio
RMSE	Root mean square error
SNR	Signal-to-noise ratio
SSIM	Structural similarity
TMI	Total magnetic intensity
UAV	Unmanned aerial vehicle
UXO	Unexploded ordnance
VMI	Vector magnetic intensity
VTOL	Vertical take-off and landing
WSTD	Wavelet soft threshold denoising