Example of using ol3 and d3 together.
The example loads TopoJSON geometries and uses d3 (d3.geo.path) to render these geometries to a canvas element that is then used as the image of an ol3 image layer.
d3.geo.path
<!DOCTYPE html> <html> <head> <title>d3 integration example</title> <script src="https://code.jquery.com/jquery-1.11.2.min.js"></script> <link rel="stylesheet" href="https://maxcdn.bootstrapcdn.com/bootstrap/3.3.5/css/bootstrap.min.css"> <script src="https://maxcdn.bootstrapcdn.com/bootstrap/3.3.5/js/bootstrap.min.js"></script> <link rel="stylesheet" href="http://openlayers.org/en/3.8.1/css/ol.css" type="text/css"> <script src="http://openlayers.org/en/3.8.1/build/ol.js"></script> <script src="http://d3js.org/d3.v3.min.js"></script> <script src="http://d3js.org/topojson.v1.min.js"></script> </head> <body> <div class="container-fluid"> <div class="row-fluid"> <div class="span12"> <div id="map" class="map"></div> </div> </div> </div> <script> // NOCOMPILE // this example uses d3 for which we don't have an externs file. var map = new ol.Map({ layers: [ new ol.layer.Tile({ source: new ol.source.Stamen({ layer: 'watercolor' }) }) ], target: 'map', view: new ol.View({ center: ol.proj.fromLonLat([-97, 38]), zoom: 4 }) }); /** * Load the topojson data and create an ol.layer.Image for that data. */ d3.json('data/topojson/us.json', function(error, us) { var features = topojson.feature(us, us.objects.counties); /** * This function uses d3 to render the topojson features to a canvas. * @param {ol.Extent} extent Extent. * @param {number} resolution Resolution. * @param {number} pixelRatio Pixel ratio. * @param {ol.Size} size Size. * @param {ol.proj.Projection} projection Projection. * @return {HTMLCanvasElement} */ var canvasFunction = function(extent, resolution, pixelRatio, size, projection) { var canvasWidth = size[0]; var canvasHeight = size[1]; var canvas = d3.select(document.createElement('canvas')); canvas.attr('width', canvasWidth).attr('height', canvasHeight); var context = canvas.node().getContext('2d'); var d3Projection = d3.geo.mercator().scale(1).translate([0, 0]); var d3Path = d3.geo.path().projection(d3Projection); var pixelBounds = d3Path.bounds(features); var pixelBoundsWidth = pixelBounds[1][0] - pixelBounds[0][0]; var pixelBoundsHeight = pixelBounds[1][1] - pixelBounds[0][1]; var geoBounds = d3.geo.bounds(features); var geoBoundsLeftBottom = ol.proj.transform( geoBounds[0], 'EPSG:4326', projection); var geoBoundsRightTop = ol.proj.transform( geoBounds[1], 'EPSG:4326', projection); var geoBoundsWidth = geoBoundsRightTop[0] - geoBoundsLeftBottom[0]; if (geoBoundsWidth < 0) { geoBoundsWidth += ol.extent.getWidth(projection.getExtent()); } var geoBoundsHeight = geoBoundsRightTop[1] - geoBoundsLeftBottom[1]; var widthResolution = geoBoundsWidth / pixelBoundsWidth; var heightResolution = geoBoundsHeight / pixelBoundsHeight; var r = Math.max(widthResolution, heightResolution); var scale = r / (resolution / pixelRatio); var center = ol.proj.transform(ol.extent.getCenter(extent), projection, 'EPSG:4326'); d3Projection.scale(scale).center(center) .translate([canvasWidth / 2, canvasHeight / 2]); d3Path = d3Path.projection(d3Projection).context(context); d3Path(features); context.stroke(); return canvas[0][0]; }; var layer = new ol.layer.Image({ source: new ol.source.ImageCanvas({ canvasFunction: canvasFunction, projection: 'EPSG:3857' }) }); map.addLayer(layer); }); </script> </body> </html>