Sorry, I did not finish one of the sentences properly - about knn in Postgres:
* PostgreSQL now supports k nearest neighbors indexing[1][2] - the distance function/operator could be defined for OSM changesets so that a query for given tile (or tile range) uses the knn index and at the same time returns only k nearest neighbors (where "nearest" would be "latest"). Also - to add to my previous comments about the solution - I am 100% sure that there are people who know how to solve this kind of problem, even using the tools we have (Postgres) - so part of the task is reaching out to them and consulting about the solution. _______________________________________________ dev mailing list dev@openstreetmap.org http://lists.openstreetmap.org/listinfo/dev
