Sharding is a way to split the world in small units of work, with the goal of having each unit be roughly the same effort.
Each shard is a bounding box referenced with a zoom-level, x and y coordinates. All shards have the same zoom-level and the same size.
Example: Invoke with Sharding.forString("slippy@10");
Each shard is a bounding box referenced with a zoom-level, x and y coordinates. All shards are leaf nodes in a quad tree, the root of which is Rectangle.MAXIMUM. The quad tree can be serialized to a simple text file.
Example: Invoke with Sharding.forString("dynamic@file:///path/to/tree.txt");
Each shard is a bounding box referenced with a geohash encoded string. All shards have the same precision and the same size.
Example: Invoke with Sharding.forString("geohash@4");