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@mapbox/vector-tile

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@mapbox/vector-tile

Parses vector tiles

  • 2.0.3
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increased by12.32%
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What is @mapbox/vector-tile?

@mapbox/vector-tile is a library for working with vector tiles, which are a way to deliver geographic data in small chunks. This package allows you to parse and work with vector tiles, which are commonly used in mapping applications to render map data efficiently.

What are @mapbox/vector-tile's main functionalities?

Parsing Vector Tiles

This code demonstrates how to parse a vector tile file and convert its features to GeoJSON format. It reads a vector tile from the file system, parses it using the VectorTile class, and iterates over its layers and features.

const fs = require('fs');
const { VectorTile } = require('@mapbox/vector-tile');
const Protobuf = require('pbf');

const data = fs.readFileSync('path/to/vector-tile.mvt');
const tile = new VectorTile(new Protobuf(data));

for (const layerName in tile.layers) {
  const layer = tile.layers[layerName];
  console.log(`Layer: ${layerName}`);
  for (let i = 0; i < layer.length; i++) {
    const feature = layer.feature(i);
    console.log(feature.toGeoJSON(0, 0, 0));
  }
}

Accessing Feature Properties

This code shows how to access the properties of a specific feature within a vector tile. It reads the vector tile, parses it, and then retrieves the properties of the first feature in a specified layer.

const fs = require('fs');
const { VectorTile } = require('@mapbox/vector-tile');
const Protobuf = require('pbf');

const data = fs.readFileSync('path/to/vector-tile.mvt');
const tile = new VectorTile(new Protobuf(data));

const layer = tile.layers['layer-name'];
const feature = layer.feature(0);
console.log(feature.properties);

Converting Features to GeoJSON

This code demonstrates how to convert a feature from a vector tile to GeoJSON format. It reads and parses the vector tile, retrieves a feature from a specified layer, and converts it to GeoJSON.

const fs = require('fs');
const { VectorTile } = require('@mapbox/vector-tile');
const Protobuf = require('pbf');

const data = fs.readFileSync('path/to/vector-tile.mvt');
const tile = new VectorTile(new Protobuf(data));

const layer = tile.layers['layer-name'];
const feature = layer.feature(0);
const geojson = feature.toGeoJSON(0, 0, 0);
console.log(JSON.stringify(geojson, null, 2));

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Package last updated on 16 Jul 2024

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