Applications
B2-2 ENVI-MAG Manual
Line and Station spacing vs. Anomaly width
To be certain that you have detected an anomaly, you need a minimum of two
data points to define it. In order to get at least two data points to position an
anomaly along the survey line, the station spacing should be less than half the
expected width of the target. In order to determine the strike length of a body, the
same holds true for the line spacing—it should be less than half the expected
length of the target, in order to have at least two survey lines crossing the target.
This detectability threshold of twice the sample spacing is sometimes referred to
as the Nyquist frequency in more advanced magnetic data processing. The
following figure (Figure B14) illustrates these points.
Figure B14 Sampling interval and anomaly resolution.
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