Generates Mapbox Vector Tiles from geojson files. It will output a directory containing the vector tiles in the pbf format with gzip compression.
npm install @hotosm/geojson2vt
geojson2vt takes a config object with the GeoJSONs to encode and other options, and builds the vector tiles pyramid in the specified output directory.
var fs = require('fs');
var geojson2vt = require('geojson2vt');
var options = {
layers: {
layer0: JSON.parse(fs.readFileSync('bus_routes.geojson', "utf8")),
layer1: JSON.parse(fs.readFileSync('stops.geojson', "utf8"))
},
rootDir: 'tiles',
bbox: [40.426042,-74.599228,40.884448,-73.409958], // [south,west,north,east]
zoom : {
min : 8,
max : 18,
}
};
// build the static tile pyramid
geojson2vt(options);
layers - Object<string,Object> (required) - GeoJSONs to create a vector tileset from. Keys are the layer names that will be used to access data from the respective GeoJSON when displaying data from the MVT.
rootDir - string (required) - the filepath of the directory that will be the root of the file pyramid. It will be created if it doesn't exist.
bbox - array (required) - array of lat/lon bounds like [s,w,n,e]
zoom - object (required) - object with min and max properties for the desired zoom levels in the tile pyramid
Instead of providing a single config object, you can provide two arguments: a geoJson and config object without a layers property, but instead with a layerName property for the name for the imported geoJson in the MVT.