miroli/app.js

## app.js
var svg;

d3.json('bounds.json', function(bounds) {
  window.bounds = bounds;
  initMap();
});

function initMap() {
  var map = d3.select('#map'),
      width = $('#map').width(),
      height = $('#map').height();

  var projection = d3.geo.mercator()
      .scale(1)
      .translate([0, 0]);

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

  svg = map.append('svg')
      .attr('width', width)
      .attr('height', height);

  zoom_projection(projection, path, bounds, width, height);

  svg.selectAll('.bbox')
      .data(bounds.features)
    .enter().append('path')
      .attr('class', 'bbox')
      .attr('d', path);
}

function zoom_projection(projection, path, bounds, width, height) {
    var b = path.bounds(bounds),
        s = 1 / Math.max((b[1][0] - b[0][0]) / width, (b[1][1] - b[0][1]) / height),
        t = [(width - s * (b[1][0] + b[0][0])) / 2, (height - s * (b[1][1] + b[0][1])) / 2];

    projection
        .scale(s)
        .translate(t);
}

## background.jpg

      
    Raw
  

              background.jpg
            
          
## bounds.json

      
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              bounds.json
            
          
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## index.html
<!DOCTYPE html>
<html>
<head>
	<title>D3 raster bounds</title>
	<link rel="stylesheet" href="style.css">
</head>
<body>
	<div id="map">
	</div>
	<script src="http://cdnjs.cloudflare.com/ajax/libs/jquery/2.1.4/jquery.min.js"></script>
    <script src="http://cdnjs.cloudflare.com/ajax/libs/d3/3.5.5/d3.min.js"></script>
	<script src="app.js"></script>
</body>
</html>

## style.css
#map {
  background-image: url('background.jpg');
  background-size: cover;
  height: 291px;
  width: 437px;
}
	var svg;

	d3.json('bounds.json', function(bounds) {
	window.bounds = bounds;
	initMap();
	});

	function initMap() {
	var map = d3.select('#map'),
	width = $('#map').width(),
	height = $('#map').height();

	var projection = d3.geo.mercator()
	.scale(1)
	.translate([0, 0]);

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

	svg = map.append('svg')
	.attr('width', width)
	.attr('height', height);

	zoom_projection(projection, path, bounds, width, height);

	svg.selectAll('.bbox')
	.data(bounds.features)
	.enter().append('path')
	.attr('class', 'bbox')
	.attr('d', path);
	}

	function zoom_projection(projection, path, bounds, width, height) {
	var b = path.bounds(bounds),
	s = 1 / Math.max((b[1][0] - b[0][0]) / width, (b[1][1] - b[0][1]) / height),
	t = [(width - s * (b[1][0] + b[0][0])) / 2, (height - s * (b[1][1] + b[0][1])) / 2];

	projection
	.scale(s)
	.translate(t);
	}
	<!DOCTYPE html>
	<html>
	<head>
	<title>D3 raster bounds</title>
	<link rel="stylesheet" href="style.css">
	</head>
	<body>
	<div id="map">
	</div>
	<script src="http://cdnjs.cloudflare.com/ajax/libs/jquery/2.1.4/jquery.min.js"></script>
	<script src="http://cdnjs.cloudflare.com/ajax/libs/d3/3.5.5/d3.min.js"></script>
	<script src="app.js"></script>
	</body>
	</html>
	#map {
	background-image: url('background.jpg');
	background-size: cover;
	height: 291px;
	width: 437px;
	}