Edge Enhancement
filters for mapping edges of bodies
Some examples of techniques
for mapping edges of magnetic bodies are shown below.
Tilt Angle |
The tilt angle is useful in
delineating vertical contacts from RTP gridded data. The zero contour level
of the tilt derivative marks the location of the edges of the magnetic
source. (assuming a vertical field) Depth of bodies may be
calculated using tilt derivative. Distance between the 45 degree and -45
degree contour of the tilt is twice the distance of depth to source. (See Bass Strait Magnetics example.) |
Goussev Edge Filter |
Named after Sergei Goussev,
this filter is the difference between the total gradient (analytical signal)
and the total horizontal gradient. It has the effect of vertical gradient
with long wavelength features being suppressed and short wavelengths being
enhanced. (See Bass Strait Magnetics example for
comparison of results to tilt derivative filter) |
Hyperbolic Tilt Filter |
Hyperbolic tilt angle
provides sharp edges of magnetic bodies at depth. (See Bass Strait magnetics example.) |