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barcelona-atlas

1.0.0 • Public • Published

Barcelona Atlas TopoJSON

This repository provides a simple script to generate TopoJSON files from a mirror of the Barcelona City Council's vector data.

Usage

In a browser (using d3-geo and SVG):

<!DOCTYPE html>
<svg width="960" height="500"></svg>
<script src="https://d3js.org/d3.v5.min.js"></script>
<script src="https://d3js.org/topojson.v3.min.js"></script>
<script>
 
const svg = d3.select("svg");
const path = d3.geoPath();
 
d3.json("https://unpkg.com/barcelona-atlas@0.2.0/barcelona/census_tracts.json")
  .then(barcelona => {
    svg
      .append('path')
      .attr('d', path(topojson.mesh(barcelona)))
      .attr('fill', 'none')
      .attr('stroke', 'black');
  })
  .catch(err => console.warn(err));
 
</script> 
 

In Node (using d3-geo and node-canvas):

var fs = require("fs"),
  d3 = require("d3-geo"),
  topojson = require("topojson-client"),
  Canvas = require("canvas"),
  barcelona = require("./node_modules/barcelona-atlas/barcelona/census_tracts.json");
 
var canvas = new Canvas(960, 500),
    context = canvas.getContext("2d"),
    path = d3.geoPath().context(context);
 
context.beginPath();
path(topojson.mesh(barcelona));
context.stroke();
 
canvas.pngStream().pipe(fs.createWriteStream("preview.png"));

Generating the files

Clone or download the repo, start a terminal and run npm install in the folder. This command will run the script and move the generated files to the barcelona folder.

If you need to make further adjustments (simplification, quantization) you can change the prepublish script and run npm install again.

File Reference

# barcelona/census_tracts.json

A preprojected TopoJSON (EPSG:3043) which contains six objects: census tracts, basic statistic areas, neighborhoods, big neighborhoods, districts and city. Every tract, neighborhood and district has its corresponding identifier, so it's easy to get started. See reference metadata.

# barcelona.objects.census_tracts

# barcelona.objects.aeb

# barcelona.objects.neighborhoods

# barcelona.objects.big_neighborhoods

# barcelona.objects.districts

# barcelona.objects.city

Source

Ajuntament de Barcelona / CartoBCN (CC-BY).

Last data update: 11/03/2020.

Inspiration

The original idea and implementation comes from Mike Bostock’s us-atlas and world-atlas.

Check out es-atlas and madrid-atlas, which provide other Spanish administrative divisions with the same format.

Keywords

Install

npm i barcelona-atlas

Repository

Gitgithub.com/martgnz/barcelona-atlas

Homepage

github.com/martgnz/barcelona-atlas#readme

DownloadsWeekly Downloads

3

Version

1.0.0

License

MIT

Unpacked Size

421 kB

Total Files

5

Last publish

Collaborators

  • martgnz
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