Editor's note: The Meter Reader is a regular column in TLE, coordinated by John Peirce, that seeks to highlight new ideas in geophysical fields besides seismic—particularly gravity, magnetics, and electromagnetics. If you have a short contribution on these topics that is written in the relatively informal but informative style of TLE, please submit it to Dean Clark, editor of TLE in Tulsa, or to John Peirce, at GEDCO in Calgary.

The interpretation of linear features in geophysical imagery is of considerable importance because they can correspond to dykes, faults, or other geologic discontinuities. One popular tool commonly used...

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