tilelive.js

Tilelive is designed for streaming map tiles from sources (like custom geographic data formats) to sinks (destinations, like file systems) by providing a consistent API. This repository enables the interaction between sources and sinks and is meant to be used in tandem with at least one Tilelive plugin. Tilelive plugins (modules) follow a consistent architecture (defined in API.md) and implement the logic for generating and reading map tiles from a source or putting map tiles to a destination, or both.

An example of a plugin that implements both reading (can be a source) and writing (can be a sink) is tilelive-s3.

An example use case for tilelive is creating vector tiles from a geojson file and putting them to Amazon S3. This can be accomplished by using tilelive-omnivore as the source and using tilelive-s3 as the sink. Tilelive omnivore performs special operations for generating map tiles (using mapnik), whereas tilelive-s3 is able to properly connect to Amazon S3 for putting tiles in their proper location. The Tilelive module performs all of the getting and putting within tilelive.copy.

Basic tilelive steps:

1. Require tilelive in your script, var tilelive = require('@mapbox/tilelive')
2. Register custom protocols via plugins, CustomTileSourcePlugin.registerProtocols(tilelive) or CustomTileSinkPlugin.registerProtocols(tilelive)
3. Load protocols using tilelive.load, this creates read and write streams
4. Copy from source to destination (the creating of tiles is left to the plugin) using tilelive.copy(source, sink, callback)
5. Once tiles are copied the streams are closed

See Usage for more details on the tilelive module API.

Awesome tilelive modules

• tilelive-vector - Implements the tilelive API for rendering mapnik vector tiles to raster images.
• tilelive-bridge - Implements the tilelive API for generating mapnik vector tiles from traditional mapnik datasources.
• tilelive-mapnik - mapnik renderer backend for tilelive.
• tilelive-s3 - Extends TileJSON for S3-specific tasks.
• tilelive-file - tilelive.js adapter for reading from the filesystem.
• tilelive-postgis - A tilelive source for outputting PBF-encoded tiles from PostGIS.
• tilelive-tmsource - A tilelive provider for TM2 sources.
• tilelive-cache - A caching wrapper for tilelive.js
• tilelive-overlay - Render GeoJSON features with simplestyle styles in a tilelive pipeline.
• tilelive-tmstyle - A tilelive provider for tmstyle sources.
• tilelive-http - An HTTP source for tilelive.
• node-mbtiles - A mbtiles renderer and storage backend for tilelive.
• tl - An alternate command line interface to tilelive.
• tilelive-omnivore - Implements the tilelive api for a variety of data sources.
• tilelive-xray - Tilelive vector tile visualization.
• tilelive-merge - A tilelive source that merges sources.
• tilelive-streaming - Streaming functionality for tilelive modules.
• tilelive-redis - Redis wrapping source for tilelive.
• tilelive-modules - A listing of known tilelive modules.
• tilelive-decorator - Load vector tiles from a tilelive source and decorate them with properties from redis.
• tilelive-blend - A tilelive provider that blends.
• tilelive-carto - A Carto style source for tilelive
• mongotiles - mongotiles is a tilelive backend plug-in for MongoDB GridFS.
• tilelive-rasterpbf - A tilelive source for outputting PBF-encoded rasters from PostGIS.
• tilelive-memcached - A memcached wrapping source for tilelive.
• tilelive-csvin - A streaming tilelive source for CSV inputs.
• tilelive-tms - A tilelive.js adapter for reading from a TMS service.
• tilelive-multicache - Module for adding a caching layer in front a tilelive source.
• tilelive-cardboard - Renders vector tiles from a cardboard dataset.
• tilelive-utfgrid - A tilelive provider that treats grids as tiles
• tilelive-arcgis - A tilelive.js adapter for ArcGIS tile caches.
• tilelive-mapbox - A tilelive.js source for mapbox:// URIs.
• tilelive-solid - A tilelive provider that generates solid colored tiles.
• tilelive-raster - A tilelive source for simple rasters, both local and remote.
• tilelive-null - A noop sink for tilelive.
• tilelive-noop - A no-op tilelive source.
• tilelive-csv - PBF → CSV with tilelive.
• tilelive-error - Avoid repeating error-prone initialization.
• tilelive-lambda - AWS Lambda source for tilelive.
• tilelive-cartodb - A tilelive source for CartoDB.
• cdbtiles - A tilelive backend plug-in for CouchDB.
• node-tilejson - Tile source backend for online tile sources.
• tilelive-foxgis - A tilelive plugin to serve tiles with mongodb
• tessera - A tilelive-based tile server.

Ecosytem of tilelive

Usage

Tilelive doesn't ship with any implementing modules by default. To register a module as one tilelive recognizes:

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 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.

Read/write streams

Tilelive provides an implementation of node object streams for copying tiles from one source to another.

// Copy all tiles and metadata from source A to source B.
var get = tilelive.createReadStream(sourceA);
var put = tilelive.createWriteStream(sourceB);
get.pipe(put);
put.on('finish', function() {
    console.log('done!');
});

See tilelive-copy and the streams tests for example usage of copy streams.

Parallel read streams

Tilelive can split a read operation into an arbitrary number of jobs. Pass a job parameter to options when using tilelive.createReadStream or tilelive.deserialize:

var readable = tilelive.createReadStream(src, { type: 'scanline', job: { total: 4, num: 1 } });

This instructs tilelive to only read tiles that would fall into job 1 of 4. A complete read would mean four calls each with a different num.

bin/tilelive-copy

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

Tests

To run the tests

npm test