D3 Examples - D3 Map for plotting latlon points given as xy coords from the query parameter points

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<!DOCTYPE html>
<meta charset="utf-8">
<style>
​
body {
  margin: 0;
}
​
#container {
  position: relative;
  overflow: hidden;
    background: #35363b;
}
​
#map{
    width:100%;
    height:100%;
}
​
#points{
    width:100%;
    height:100%;
    position:relative;
    z-index:100;
}
​
.layer {
  position: absolute;
}
​
.tile {
  pointer-events: none;
  position: absolute;
  width: 256px;
  height: 256px;
}
​
.info {
  position: absolute;
  bottom: 0px;
  left: 0px;
    padding: 20px;
    background: #000;
    color: #fff;
    width: 100%;
    z-index: 1000;
}
.axis path,
.axis line {
  fill: none;
  stroke: #000;
  shape-rendering: crispEdges;
}
​
.bar {
  fill: orange;
}
​
.bar:hover {
  fill: orangered ;
}
​
.x.axis path {
  display: none;
}
​
.d3-tip {
  line-height: 1;
  font-weight: bold;
  padding: 12px;
  background: rgba(0, 0, 0, 0.8);
  color: #fff;
  border-radius: 2px;
}
​
/* Creates a small triangle extender for the tooltip */
.d3-tip:after {
  box-sizing: border-box;
  display: inline;
  font-size: 10px;
  width: 100%;
  line-height: 1;
  color: rgba(0, 0, 0, 0.8);
  content: "\25BC";
  position: absolute;
  text-align: center;
}
​
/* Style northward tooltips differently */
.d3-tip.n:after {
  margin: -1px 0 0 0;
  top: 100%;
  left: 0;
}
​
</style>
<body>
<script src="https://d3js.org/d3.v3.min.js"></script>
<script src="https://d3js.org/d3.geo.tile.v0.min.js"></script>
<script src="https://labratrevenge.com/d3-tip/javascripts/d3.tip.v0.6.3.js"></script>
<script>
​
var width = Math.max(960, window.innerWidth),
    height = Math.max(500, window.innerHeight),
    prefix = prefixMatch(["webkit", "ms", "Moz", "O"]);
​
function getParameterByName(name, url) {
    if (!url) url = window.location.href;
    name = name.replace(/[\[\]]/g, "\\$&");
    var regex = new RegExp("[?&]" + name + "(=([^&#]*)|&|#|$)"),
        results = regex.exec(url);
    if (!results) return null;
    if (!results[2]) return '';
    return decodeURIComponent(results[2].replace(/\+/g, " "));
}
​
var tile = d3.geo.tile()
    .size([width, height]);
​
var projection = d3.geo.mercator()
.scale((1 << 21) / 2 / Math.PI)
.translate([-width / 2, -height / 2]); // just temporary
​
var data_points = JSON.parse(getParameterByName('points'));
var total = 0;
for(var i = 0; i < data_points.length; i++) {
    total += data_points[i]['x'];
}
var avgLat = total / data_points.length;
var total = 0;
for(var i = 0; i < data_points.length; i++) {
    total += data_points[i]['y'];
}
var avgLon = total / data_points.length;
​
var zoom = d3.behavior.zoom()
    .scale(projection.scale() * 2 * Math.PI)
    .scaleExtent([1 << 9, 1 << 25])
    .translate(projection([avgLon, avgLat]).map(function(x) { return -x; }))
    .on("zoom", zoomed);
​
var container = d3.select("body").append("div")
    .attr("id", "container")
    .style("width", width + "px")
    .style("height", height + "px")
    .call(zoom)
    .on("mousemove", mousemoved);
​
var map = container.append("g")
        .attr("id", "map")
​
var points = container.append("svg")
        .attr("id", "points")
                
var layer = map.append("div")
    .attr("class", "layer");
​
var info = map.append("div")
    .attr("class", "info");
​
var tip = d3.tip()
  .attr('class', 'd3-tip')
  .offset([0, 0])
  .html(function(d) {
    return d.num;
  })
points.call(tip)
​
function createMap(dataset) {
    d3.select("#points").selectAll("circle").data(dataset) //plotted    locations on map
    .enter()
    .append("circle")
    .style("fill", "#14e6b7")
    .style("opacity", 0.7)
    .attr("r", 8)
    .attr("cx", function(d) {return projection([d.y,d.x])[0]})
    .attr("cy", function(d) {return projection([d.y,d.x])[1]})
  .on('mouseover', tip.show)
  .on('mouseout', tip.hide)
    zoomed();
}
​
function zoomed() {
  var tiles = tile
      .scale(zoom.scale())
      .translate(zoom.translate())
      ();
​
  projection
      .scale(zoom.scale() / 2 / Math.PI)
      .translate(zoom.translate());
​
            d3.selectAll("circle")
            .attr("cx", function(d) {return projection([d.y,d.x])[0]})
            .attr("cy", function(d) {return projection([d.y,d.x])[1]})
​
  var image = layer
      .style(prefix + "transform", matrix3d(tiles.scale, tiles.translate))
    .selectAll(".tile")
      .data(tiles, function(d) { return d; });
​
  image.exit()
      .remove();
​
  image.enter().append("img")
      .attr("class", "tile")
      .attr("src", function(d) { return "https://" + ["a", "b", "c", "d"][Math.random() * 4 | 0] + ".tiles.mapbox.com/v3/jhubley.kllla0l7/" + d[2] + "/" + d[0] + "/" + d[1] + ".png"; })
      .style("left", function(d) { return (d[0] << 8) + "px"; })
      .style("top", function(d) { return (d[1] << 8) + "px"; });
}
​
function mousemoved() {
  info.text(formatLocation(projection.invert(d3.mouse(this)), zoom.scale()));
}
​
function matrix3d(scale, translate) {
  var k = scale / 256, r = scale % 1 ? Number : Math.round;
  return "matrix3d(" + [k, 0, 0, 0, 0, k, 0, 0, 0, 0, k, 0, r(translate[0] * scale), r(translate[1] * scale), 0, 1 ] + ")";
}
​
function prefixMatch(p) {
  var i = -1, n = p.length, s = document.body.style;
  while (++i < n) if (p[i] + "Transform" in s) return "-" + p[i].toLowerCase() + "-";
  return "";
}
​
function formatLocation(p, k) {
  var format = d3.format("." + Math.floor(Math.log(k) / 2 - 2) + "f");
  return (p[1] < 0 ? format(-p[1]) + "°S" : format(p[1]) + "°N") + " "
       + (p[0] < 0 ? format(-p[0]) + "°W" : format(p[0]) + "°E");
}
​
​
createMap(data_points)
</script>
</body>
</html>
    