One detail in the PMTiles version 3 specification is a boolean flag called clustered. Popular tools like the pmtiles CLI, tippecanoe and Planetiler always create clustered archives. PMTiles is an open specification in the public domain, so this post is to aid developers in implementing this optional feature. Clustered The term clustered comes from relational databases: the PostgreSQL manual defines that “When a table is clustered, it is physically reordered based on the index information.
