reachabilityplot
A reachability plot is a visualization used in density-based clustering, most commonly with the OPTICS algorithm. It displays the reachability distance of each point in the order produced by OPTICS, plotted against the point’s position in that order. The plot provides a compact representation of the clustering structure in a dataset without imposing a fixed global density threshold.
Construction and definition: During the OPTICS process, each point has a core distance, defined as the distance
Interpretation: In a reachability plot, clusters are typically represented by valleys—continuous runs of low reachability distances—while
Limitations and usage: The interpretation of a reachability plot depends on parameter choices, such as minPts