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Abstract
An analysis of linear features mapped from a Landsat image of a geologically and topographically varied area of Wairarapa showed that 50% of them could be readily located in a subsequent ground survey. Most were surface expression of faults; some were escarpments; some were particularly straight valleys that may have some (unrecognised) structural control; and a few were roads and vegetation changes. Where those associated with ground features were running at right angles to the image sun direction, they were enhanced by shadowing. Such shadowing was also responsible for most of the artifacts for which no ground feature could be identified.
A comparison of different image enhancement options indicates that a band 4 image (MSS band 7), filtered and then stretched, was best for studying linear features.