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Shaded Relief with AlbersUsa Projection
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<!DOCTYPE html> | |
<html lang="en"> | |
<head> | |
<meta charset="utf-8"> | |
<script src="https://cdnjs.cloudflare.com/ajax/libs/d3/3.5.6/d3.min.js" charset="utf-8"></script> | |
<script src="https://cdnjs.cloudflare.com/ajax/libs/topojson/1.6.19/topojson.min.js"></script> | |
</head> | |
<body> | |
<script type="text/javascript"> | |
var w = 900; | |
var h = 500; | |
var projection = d3.geo.albersUsa() | |
.translate([w/2-100, h/2+20]) | |
.scale([850]); | |
var path = d3.geo.path() | |
.projection(projection); | |
var svg = d3.select("body") | |
.append("svg") | |
.attr("width", w) | |
.attr("height", h) | |
.append("g"); | |
d3.json("us-land.json", function(error, us) { | |
if (error) throw error; | |
var defs = svg.append("defs"); | |
defs.append("path") | |
.datum(topojson.feature(us, us.objects.land)) | |
.attr("id", "land") | |
.attr("d", path) | |
.style("fill", "none"); | |
svg.append("clipPath") | |
.attr("id", "clip1") | |
.attr("transform","translate(18,-48)") | |
.append("use") | |
.attr("xlink:href", "#land"); | |
//append and clip the shaded relief bitmap | |
//scale factor and translation determined through trial and error | |
svg.append("image") | |
.attr("width", 900*0.8) | |
.attr("height", 600*0.8) | |
.attr("transform","translate(-18,48)") | |
.attr("clip-path", "url(#clip1)") | |
.attr("xlink:href", "lower48.png"); | |
svg.append("clipPath") | |
.attr("id", "clip2") | |
.attr("transform","translate(-3,-368)") | |
.append("use") | |
.attr("xlink:href", "#land"); | |
svg.append("image") | |
.attr("width", 300*0.62) | |
.attr("height", 202*0.62) | |
.attr("transform","translate(3,368)") | |
.attr("clip-path", "url(#clip2)") | |
.attr("xlink:href", "alaska.png"); | |
svg.append("use") | |
.attr("xlink:href", "#land"); | |
}); | |
</script> | |
</body> | |
</html> |
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