d3.geo.equirectangular = function() {

  var scale = 500,

      translate = [480, 250];

  function equirectangular(coordinates) {

    var x = coordinates[0] / 360,

        y = -coordinates[1] / 360;

    return [

      scale * x + translate[0],

      scale * y + translate[1]

    ];

  }

  equirectangular.invert = function(coordinates) {

    var x = (coordinates[0] - translate[0]) / scale,

        y = (coordinates[1] - translate[1]) / scale;

    return [

      360 * x,

      -360 * y

    ];

  };

  equirectangular.scale = function(x) {

    if (!arguments.length) return scale;

    scale = +x;

    return equirectangular;

  };

  equirectangular.translate = function(x) {

    if (!arguments.length) return translate;

    translate = [+x[0], +x[1]];

    return equirectangular;

  };

  return equirectangular;

};