npm package discovery and stats viewer.

Discover Tips

  • General search

    [free text search, go nuts!]

  • Package details

    pkg:[package-name]

  • User packages

    @[username]

Sponsor

Optimize Toolset

I’ve always been into building performant and accessible sites, but lately I’ve been taking it extremely seriously. So much so that I’ve been building a tool to help me optimize and monitor the sites that I build to make sure that I’m making an attempt to offer the best experience to those who visit them. If you’re into performant, accessible and SEO friendly sites, you might like it too! You can check it out at Optimize Toolset.

About

Hi, 👋, I’m Ryan Hefner  and I built this site for me, and you! The goal of this site was to provide an easy way for me to check the stats on my npm packages, both for prioritizing issues and updates, and to give me a little kick in the pants to keep up on stuff.

As I was building it, I realized that I was actually using the tool to build the tool, and figured I might as well put this out there and hopefully others will find it to be a fast and useful way to search and browse npm packages as I have.

If you’re interested in other things I’m working on, follow me on Twitter or check out the open source projects I’ve been publishing on GitHub.

I am also working on a Twitter bot for this site to tweet the most popular, newest, random packages from npm. Please follow that account now and it will start sending out packages soon–ish.

Open Software & Tools

This site wouldn’t be possible without the immense generosity and tireless efforts from the people who make contributions to the world and share their work via open source initiatives. Thank you 🙏

© 2024 – Pkg Stats / Ryan Hefner

@mapbox/vector-tile

v2.0.3

Published

Parses vector tiles

Downloads

4,862,162

Readme

vector-tile

This library reads Mapbox Vector Tiles and allows access to the layers and features.

Example

import {VectorTile} from '@mapbox/vector-tile';
import Protobuf from 'pbf';

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

// Contains a map of all layers
tile.layers;

const landuse = tile.layers.landuse;

// Amount of features in this layer
landuse.length;

// Returns the first feature
landuse.feature(0);

Vector tiles contained in serialtiles-spec are gzip-encoded, so a complete example of parsing them with the native zlib module would be:

import {VectorTile} from '@mapbox/vector-tile';
import Protobuf from 'pbf';
import {gunzipSync} from 'zlib';

const buffer = gunzipSync(data);
const tile = new VectorTile(new Protobuf(buffer));

Install

To install:

npm install @mapbox/vector-tile

API Reference

VectorTile

An object that parses vector tile data and makes it readable.

Constructor

  • new VectorTile(protobuf[, end]) — parses the vector tile data contained in the given Protobuf object, saving resulting layers in the created object as a layers property. Optionally accepts end index.

Properties

  • layers (Object) — an object containing parsed layers in the form of {<name>: <layer>, ...}, where each layer is a VectorTileLayer object.

VectorTileLayer

An object that contains the data for a single vector tile layer.

Properties

  • version (Number, default: 1)
  • name (String) — layer name
  • extent (Number, default: 4096) — tile extent size
  • length (Number) — number of features in the layer

Methods

  • feature(i) — get a feature (VectorTileFeature) by the given index from the layer.

VectorTileFeature

An object that contains the data for a single feature.

Properties

  • type (Number) — type of the feature (also see VectorTileFeature.types)
  • extent (Number) — feature extent size
  • id (Number) — feature identifier, if present
  • properties (Object) — object literal with feature properties

Methods

  • loadGeometry() — parses feature geometry and returns an array of Point arrays (with each point having x and y properties)
  • bbox() — calculates and returns the bounding box of the feature in the form [x1, y1, x2, y2]
  • toGeoJSON(x, y, z) — returns a GeoJSON representation of the feature. (x, y, and z refer to the containing tile's index.)