level-z
levelZ creates a sublevel db with the passed in name, that will insert items using their z-order index, so they can easily be queried by location. Items can still be retrieved efficiently by their primary id (this now requires 2 lookups rather than 1).
the new db has the following methods:
- get: get entry by original id
- put: insert an item by id, item should also have lat/long keys (items currently do not support being moved)
- del: delete an item
- createReadStream: default level readstream (note that keys are a z-order index, rather than insert key)
- inBoundingBox: inBoundingBox: returns a stream of entries within (or close to) the bounding box. takes 1 arg: [[xMin, xMax], [yMin, yMax]]
var map = var n = 0;for var i = -18; i <= 18; ++i for var j = -9; j <= 9; ++j grid map
Note: currently bounding box results are not filtered, so they may contain locations near the search area that are slightly outside the bounding box.