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example-tile-geojson-extraction.js

var VectorTile = require('vector-tile').VectorTile;
var Protobuf = require('pbf');
var fs = require('fs');
var path = require('path');

var data = fs.readFileSync(path.join(__dirname, './pbfs/river.vector.pbf'));

var tile = new VectorTile(new Protobuf(data));

var layer = tile.layers['russian-river'];

var features = [];
for (var i = 0; i < layer.length; i++) {
  features.push(layer.feature(i).toGeoJSON(0, 15, 6));
}

var collection = {
  type: 'FeatureCollection',
  features: features,
};

console.log(JSON.stringify(collection, null, 2));

original-russian-river.geojson

original-russian-triangle.geojson

split-russian-river.geojson

split-russian-triangle.geojson

tiled-russian-river.geojson

{
  "type": "FeatureCollection",
  "features": [
    {
      "type": "Feature",
      "geometry": {
        "type": "LineString",
        "coordinates": [
          [
            -180,
            66.91606486099056
          ],
          [
            -180,
            66.91391101065432
          ],
          [
            -179.98489379882812,
            66.91444949104746
          ]
        ]
      },
      "properties": {},
      "id": 1
    }
  ]
}

tiled-russian-triangle.geojson