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Motivated by the growing interest in the use of ridges in scientific visualization, we analyze the two height ridge definitions by Eberly and Lindeberg. We propose a raw feature definition leading to a superset of the ridge points as obtained by these two definitions. The set of raw feature points has the correct dimensionality, and it can be narrowed down to either Eberly's or Lindeberg's ridges by using Boolean filters which we formulate. While the straight-forward computation of heightdoi:10.1109/pacificvis.2008.4475467 dblp:conf/apvis/PeikertS08 fatcat:ec3tjhopu5amvjbwxloytcy3ku