This example illustrates this GeoExamples blog entry. The map uses the base from the first example, but adding "drop shadow" filter as explained in this gist by Charl P. Botha.
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January 2, 2016 03:49
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Drop shadow filter for the Haiyan typhoon track
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| <!DOCTYPE html> | |
| <meta charset="utf-8"> | |
| <style> | |
| .graticule { | |
| fill: none; | |
| stroke: #777; | |
| stroke-opacity: .5; | |
| stroke-width: .5px; | |
| } | |
| .land { | |
| fill: #999; | |
| } | |
| .boundary { | |
| fill: none; | |
| stroke: #fff; | |
| stroke-width: .5px; | |
| } | |
| </style> | |
| <body> | |
| <script src="http://d3js.org/d3.v3.min.js"></script> | |
| <script src="http://d3js.org/topojson.v1.min.js"></script> | |
| <script src="http://d3js.org/colorbrewer.v1.min.js"></script> | |
| <script> | |
| var width = 600, | |
| height = 500; | |
| var projection = d3.geo.mercator() | |
| .scale(5*(width + 1) / 2 / Math.PI) | |
| .translate([width / 2, height / 2]) | |
| .rotate([-125, -15, 0]) | |
| .precision(.1); | |
| var path = d3.geo.path() | |
| .projection(projection); | |
| var graticule = d3.geo.graticule(); | |
| var svg = d3.select("body").append("svg") | |
| .attr("width", width) | |
| .attr("height", height); | |
| var filter = svg.append("defs") | |
| .append("filter") | |
| .attr("id", "drop-shadow") | |
| .attr("height", "130%"); | |
| filter.append("feGaussianBlur") | |
| .attr("in", "SourceAlpha") | |
| .attr("stdDeviation", 5) | |
| .attr("result", "blur"); | |
| filter.append("feOffset") | |
| .attr("in", "blur") | |
| .attr("dx", 5) | |
| .attr("dy", 5) | |
| .attr("result", "offsetBlur"); | |
| var feMerge = filter.append("feMerge"); | |
| feMerge.append("feMergeNode") | |
| .attr("in", "offsetBlur") | |
| feMerge.append("feMergeNode") | |
| .attr("in", "SourceGraphic"); | |
| svg.append("path") | |
| .datum(graticule) | |
| .attr("class", "graticule") | |
| .attr("d", path); | |
| d3.json("/mbostock/raw/4090846/world-50m.json", function(error, world) { | |
| svg.insert("path", ".graticule") | |
| .datum(topojson.feature(world, world.objects.land)) | |
| .attr("class", "land") | |
| .attr("d", path) | |
| .style("filter", "url(#drop-shadow)"); | |
| svg.insert("path", ".graticule") | |
| .datum(topojson.mesh(world, world.objects.countries, function(a, b) { return a !== b; })) | |
| .attr("class", "boundary") | |
| .attr("d", path); | |
| }); | |
| d3.select(self.frameElement).style("height", height + "px"); | |
| </script> |
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