border_map needs to disappear, and instead be replaced by something that can access/cache the border points of a given cluster in the hierarchy. That is to say "Cluster C, is a connected component, its elements are core points at that scale. But they should also have a set of border points B_c, which might be defined recursively. That is, when C is split, its children can only have border points from within B_c, and then we also spawn two new border point sets".
IN short:
no border_map
yes border set. (claimed?)
border_map needs to disappear, and instead be replaced by something that can access/cache the border points of a given cluster in the hierarchy. That is to say "Cluster C, is a connected component, its elements are core points at that scale. But they should also have a set of border points B_c, which might be defined recursively. That is, when C is split, its children can only have border points from within B_c, and then we also spawn two new border point sets".
IN short:
no border_map
yes border set. (claimed?)