Broad Street Pump

.block

license: mit
height: 800

README.md

This recreates John Snow's famous "Broad Street Pump" map. The london map is a rough reversal of Charles Cheffins' 1854 lithography into geographical data, which is then drawn using D3.

deaths.json

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index.html

<!DOCTYPE html>
<meta charset='utf-8'>
<style>
svg {
  font: 10px sans-serif;
}
.border path {
  fill: none;
  stroke: #faa;
  stroke-dasharray: 10, 3, 2, 3;
  stroke-width : 1.6;
}
.house {
  fill: #e4dfd4;
}
.square {
  fill: #d3e2be;
}
.pumps path {
  fill: #0099cc;
}
.deaths path {
  fill: #c88;
  stroke: #842A2A;
  stroke-width: 0.5;
}
.places {
  fill: black;
  font-size: 12px;
  text-shadow: 0px 2px white;
  text-anchor: middle;
}
.roads {
  fill: #888;
  font-size: 9px;
  text-anchor: middle;
}

.legend rect {
  fill: white;
  fill-opacity: .75;
  stroke: white;
}
.legend text {
  font-size: 12px;
}

</style>
<body>
<script src="//d3js.org/d3.v3.min.js"></script>
<script src="//d3js.org/queue.v1.min.js"></script>
<script src="//d3js.org/topojson.v1.min.js"></script>
<script>

var width = 960,
    height = 800;

var proj = d3.geo.mercator()
    .scale( 43e5 )
    .center([ -0.1376, 51.5131 ])
    .translate([ width/2, height/2 ])
    .clipExtent([ [ 0, 0 ], [ width, height ] ])
    .precision( 0 );

var path = d3.geo.path()
    .projection( proj );

var svg = d3.select( 'body' ).append( 'svg' )
    .attr( 'width', width )
    .attr( 'height', height );

queue()
    .defer( d3.json, 'soho_1854.json' )
    .defer( d3.json, 'deaths.json' )
    .await( ready );

function ready ( err, map, deaths ) {
  if (err) throw err;

  // houses and squares
  svg.append( 'g' )
    .attr( 'class', 'city' )
    .selectAll( 'path' )
      .data( topojson.feature(map, map.objects.houses).features )
    .enter().append( 'path' )
      .attr( 'class', d => d.properties.type )
      .attr( 'd', path );

  // area border
  svg.append( 'g' )
    .attr( 'class', 'border' )
    .selectAll( 'path' )
      .data( topojson.feature(map, map.objects.border).features )
    .enter().append( 'path' )
      .attr( 'd', path );

  // houses labels
  svg.append( 'g' )
    .attr( 'class', 'places' )
    .selectAll( 'text' )
      .data( topojson.feature(map, map.objects.houses).features
          .filter( d => d.properties.title ) )
    .enter().append( 'text' )
      .attr( 'dy', '0.32em' )
      .text( d => d.properties.title )
      .attr( 'transform', d => `translate(${path.centroid(d)})` );

  // road labels
  svg.append( 'g' )
    .attr( 'class', 'roads' )
    .selectAll( 'text' )
      .data( topojson.feature(map, map.objects.roads).features )
    .enter().append( 'text' )
      .text( d => d.properties.title )
      .attr( 'dy', '0.32em' )
      .attr( 'transform', d => {
        var xy = proj( d.geometry.coordinates ),
            deg = d.properties.angle * (180 / Math.PI);
        return `translate(${xy}) rotate(${deg})`;
      });

  // pumps
  var pump = d3.svg.symbol().type( 'square' ).size( 40 );
  svg.append( 'g' )
    .attr( 'class', 'pumps' )
    .selectAll( 'path' )
      .data( topojson.feature( map, map.objects.pumps ).features )
    .enter().append( 'path' )
      .attr( 'd', pump )
      .attr( 'transform', d => `translate(${proj(d.geometry.coordinates)}) rotate(45)` );

  // deaths
  var death = d3.svg.symbol().type( 'circle' ).size( 10 );
  svg.append( 'g' )
    .attr( 'class', 'deaths' )
    .selectAll( 'path' )
      .data( deaths.sort( ( a, b ) => a[0] - b[0] ) )
    .enter().append( 'path' )
      .attr( 'd', death )
      .attr( "transform", d => `translate(${proj(d)})` );

  // legend
  var legend = svg.append( 'g' )
      .attr( 'class', 'legend' )
      .attr( 'transform', 'translate(15,15)' );

  legend.append( 'rect' )
      .attr( 'width', 180 )
      .attr( 'height', 66 );

  var label1 = legend.append( 'g' )
      .attr( 'class', 'deaths' )
      .attr( 'transform', 'translate(20,22)' );
  label1.append( 'text' )
      .attr( 'x', 8 )
      .text( 'A death from Cholera' )
      .attr( 'dy', '.32em' );
  label1.append( 'path' )
      .attr( 'd', death );

  var label2 = legend.append( 'g' )
      .attr( 'class', 'pumps' )
      .attr( 'transform', 'translate(20,44)' );
  label2.append( 'text' )
      .attr( 'x', 8 )
      .text( 'Water pump' )
      .attr( 'dy', '.32em' );
  label2.append( 'path' )
      .attr( 'd', pump );

}
</script>

soho_1854.json

thumbnail.png