grid_advanced mode merges grids too aggressively

sigmafelix commented 3 months ago

mode = "grid_advanced" utilizes minimum spanning tree to merge adjacent grids with intersecting grids less than a threshold.
In a highly clustered point sets, this approach results in broad outskirts and a few internal unmerged grids. Points in the outskirt could exceed the number of intersecting points with any grids, which is not intended.
Simple go-around is that the merged grids are split by a few horizontal/vertical line
- Could we design this in a sophisticated way while keeping a decent performance?

sigmafelix commented 2 months ago

Resolved by #70.

sigmafelix commented 2 months ago

The revision does not work consistently. I will work on this issue again soon.

sigmafelix commented 1 month ago

Resolved by #77

Future roadmap is -- allowing to merge nonadjacent grids getting points below the threshold.

NIEHS / chopin