diff -r efd9c589177a -r c0b4a8b5a012 toolkit/javascript/d3/src/geo/mercator.js
--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/toolkit/javascript/d3/src/geo/mercator.js	Thu Apr 10 14:20:23 2014 +0200
@@ -0,0 +1,36 @@
+d3.geo.mercator = function() {
+  var scale = 500,
+      translate = [480, 250];
+
+  function mercator(coordinates) {
+    var x = coordinates[0] / 360,
+        y = -(Math.log(Math.tan(Math.PI / 4 + coordinates[1] * d3_geo_radians / 2)) / d3_geo_radians) / 360;
+    return [
+      scale * x + translate[0],
+      scale * Math.max(-.5, Math.min(.5, y)) + translate[1]
+    ];
+  }
+
+  mercator.invert = function(coordinates) {
+    var x = (coordinates[0] - translate[0]) / scale,
+        y = (coordinates[1] - translate[1]) / scale;
+    return [
+      360 * x,
+      2 * Math.atan(Math.exp(-360 * y * d3_geo_radians)) / d3_geo_radians - 90
+    ];
+  };
+
+  mercator.scale = function(x) {
+    if (!arguments.length) return scale;
+    scale = +x;
+    return mercator;
+  };
+
+  mercator.translate = function(x) {
+    if (!arguments.length) return translate;
+    translate = [+x[0], +x[1]];
+    return mercator;
+  };
+
+  return mercator;
+};