D3 Examples - d3.js map with markers

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​
<!DOCTYPE html>
<meta charset="utf-8">
<style>
​
.graticule {
  fill: none;
  stroke: #777;
  stroke-opacity: .5;
  stroke-width: .5px;
}
​
.land {
  fill: #222;
}
​
.boundary {
  fill: none;
  stroke: #fff;
  stroke-width: .5px;
}
​
circle {
  fill: yellow;
}
​
.geopath {
  fill: green;
}
​
</style>
<body>
<script src="https://d3js.org/d3.v3.min.js"></script>
<script src="https://d3js.org/topojson.v1.min.js"></script>
<script>
​
var width = 1200,
    height = 720;
​
var projection = d3.geo.mercator()
    .scale(8000)
    .precision(.1)
    .center([13.320255,52.52831499])
    .translate([width / 2, height / 2])
​
var path = d3.geo.path()
    .projection(projection);
​
var graticule = d3.geo.graticule();
​
var svg = d3.select("body").append("svg")
    .attr("width", width)
    .attr("height", height);
​
svg.append("path")
    .datum(graticule)
    .attr("class", "graticule")
    .attr("d", path);
​
d3.json("world-50m.json", function(error, world) {
  svg.insert("path", ".graticule")
      .datum(topojson.feature(world, world.objects.land))
      .attr("class", "land")
      .attr("d", path);
​
  svg.insert("path", ".graticule")
      .datum(topojson.mesh(world, world.objects.countries, function(a, b) { return a !== b; }))
      .attr("class", "boundary")
      .attr("d", path);
});
​
d3.json("stops_berlin.geojson", function(error, data) {
​
  // using d3.geo.path() which does all the work for you
  svg.append("path")
    .datum(data)
    .classed("geopath", true)
    .attr("d", path)
​
  // or insert your own custom dots by hand
  svg.append("g")
    .selectAll("g")
    .data(data.features)
    .enter()
      .append("g")
      .attr("transform", function(d) { return "translate(" + projection(d.geometry.coordinates) + ")"; })
      .append("circle")
      .attr("r", 1)
​
});
​
d3.select(self.frameElement).style("height", height + "px");
  
</script>
​
    