vt-pbf

Serialize Mapbox vector tiles to binary protobufs in javascript.

Usage

As far as I know, the two places you might get a JS representation of a vector tile are geojson-vt and vector-tile-js. These both use slightly different internal representations, so serializing each looks slightly different:

From vector-tile-js

varvtpbf=require('vt-pbf')varVectorTile=require('@mapbox/vector-tile').VectorTilevarProtobuf=require('pbf')vardata=fs.readFileSync(__dirname+'/fixtures/rectangle-1.0.0.pbf')vartile=newVectorTile(newProtobuf(data))varorig=tile.layers['geojsonLayer'].feature(0).toGeoJSON(0,0,1)varbuff=vtpbf(tile)fs.writeFileSync('my-tile.pbf',buff)

From geojson-vt

varvtpbf=require('vt-pbf')vargeojsonVt=require('geojson-vt')varorig=JSON.parse(fs.readFileSync(__dirname+'/fixtures/rectangle.geojson'))vartileindex=geojsonVt(orig)vartile=tileindex.getTile(1,0,0)// pass in an object mapping layername -> tile objectvarbuff=vtpbf.fromGeojsonVt({'geojsonLayer': tile})fs.writeFileSync('my-tile.pbf',buff)

vtpbf.fromGeojsonVt takes two arguments:

• layerMap is an object where keys are layer names and values are a geojson-vt tile,
• options is an object (optional argument). There are 2 supported keys: version to define the version of the mvt spec used and extent to define the extent of the tile. version defaults to 1 and extent to 4096.