isabella232 / nodetiles-init

An example server showing off how awesome Nodetiles is

Nodetiles-init

This is an example webserver for use with the nodetiles-core library, a fully-featured map rendering library for Node.js. This code is meant to be a convenient starting place for using Nodetiles to build a slippy-map — including Leaflet, Wax, and default asset/image routes — but is by no means only way to use the nodetiles-core library.

Installation

After downloading, be sure to install the dependencies (this may require installing cairo and pixman):

$ npm install

Then start the server:

$ node server.example.js

And visit the webpage: http://localhost:3000

Configuration

This Nodetiles example can be easily configured by modifying the node.server.js file; the map configuration starts around line 30:

// Create the new map
var map = new nodetiles.Map();

// Add a datasource named 'world" from the countries.geojson file
map.addData(new GeoJsonSource({ 
  name: "world",
  path: __dirname + '/map/data/countries.geojson', 
  projection: "EPSG:900913"
}));

// Add a 2nd geojson datasource
map.addData(new GeoJsonSource({ 
  name: "example",
  path: __dirname + '/map/data/example.geojson', 
  projection: "EPSG:4326"
}));

// Link to your Mapnik style sheet
map.addStyle(fs.readFileSync('./map/theme/style.mss','utf8'));

This data is then rendered into map tiles on-the-fly when the web map framework (Wax+Leaflet) make a GET request to the appropriate map tile URL: /:row/:column/:zoom.png.

You can easily add new GeoJSON files… or PostGIS files via the PostGIS data connector:

map.addData(newPostGISSource({
  connectionString: "tcp://postgres@localhost/postgis", // required
  tableName: "ogrgeojson",                              // required
  geomField: "wkb_geometry",                            // required
  fields: "map_park_n, ogc_fid",                        // optional, speeds things up
  name: "sf_parks",                                     // optional, uses table name otherwise
  projection: 900913,                                   // optional, defaults to 4326
});

Data

example data Natural Earth projected to 900913 with zipit