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tilelive.js

tilelive.js is an interface for tilestore modules for node.js. It defines an API to interact with implementations for a particular tile store.

Backends

• MBTiles
• TileJSON
• Mapnik

Usage

Tilelive doesn't ship with any Tilestore backends by default. To use a particular backend, register it with tilelive using require('[implementation]').registerProtocols(tilelive);.

• tilelive.list(source, callback): Lists all tilesets in a directory. source is a folder that is used by registered implementations to search for individual tilesets. callback receives an error object (or null) and a hash hash with keys being Tilestore IDs and values being Tilestore URIs. Example:

{
    "world-light": "mbtiles:///path/to/file/world-light.mbtiles",
    "mapquest": "tilejson:///path/to/file/mapquest.tilejson"
}

• tilelive.findID(source, id, callback): Looks for a particular tileset ID in a directory. callback receives an error object (or null) and the URI of the tileset.

• tilelive.load(uri, callback): Loads the Tilestore object associated with the specified uri. callback receives an error object (or null) and the Tilestore object.

• tilelive.info(uri, callback): Loads the Tilestore object associated with the specified uri and retrieves its metadata in a TileJSON compliant format. callback receives an error object (or null), the metadata hash and the Tilestore object.

• tilelive.all(source, callback): Loads metadata in a TileJSON compliant format for all tilesets in the source directory. callback receives an error object (or null) and an array with TileJSON metadata about each tileset in that directory.

• tilelive.verify(tilejson): Validates a TileJSON object and returns error objects for invalid entries.

• tilelive.copy(args, callback): Copies data from one tilestore into another tilestore. args is a configuration hash with these keys:

  • source: a Tilestore object that implements the Tilesource interface
  • sink: a Tilestore object that implements the Tilesink interface
  • bbox: an array with W/S/E/N boundaries in WGS84 format (-180...180, -90...90)
  • minZoom: the minimum zoom for data to be copied (inclusive)
  • maxZoom: the maximum zoom for data to be copied (inclusive)
  • concurrency: (default: 100) how many data objects should be copied simultaneously.
  • callback: (optional) called when copying is complete
  • tiles: copy tiles (true or false)
  • grids: copy grids (true or false)

  This function returns an EventEmitter that has these events emitted:

  • warning: An error occurred during copying. err is the first argument.
  • error: An error occured while initializing the tilesource/tilesink.
  • finished: Copying completed

  The EventEmitter also has these properties. They are updated continuously while copying. Check them occassionally to report status to the user.

  • copied: Number of elements that have been copied so far
  • failed: Number of elements that couldn't be copied.
  • total: Total number of elements to be copied.
  • started: Timestamp of when the action started in milliseconds after epoch

bin/tilelive

tilelive can be used to copy data between tilestores. For a full list of options, run bin/tilelive.

Tests

To run the tests

npm test

Usage

See examples for examples of a tilelive powered server.