Shown is Lake Superior and the surrounding terrain, using data from NASA’s Shuttle Radar Topography Mission and bathymetry data from NOAA.
The two images are layered using a clipping path of the lake, from Natural Earth’s 10m vector lake dataset.
Hill relief, as usual, was generated using the gdal utility suite.
| <!doctype html> | |
| <meta charset='utf-8'> | |
| <title>Lake Superior</title> | |
| <style> | |
| .lake { | |
| stroke: none; | |
| fill: none; | |
| } | |
| </style> | |
| <svg></svg> | |
| <script src="http://d3js.org/d3.v3.min.js"></script> | |
| <script src="http://d3js.org/topojson.v0.min.js"></script> | |
| <script> | |
| var width = 960, | |
| height = 500, | |
| svg = d3.select("svg").attr("width", width).attr("height", height); | |
| var projection = d3.geo.albers() | |
| .rotate([88.1, 0]) | |
| .center([0, 47.7]) | |
| .parallels([45.5, 49.8]) | |
| .scale(9600) | |
| var path = d3.geo.path() | |
| .projection(projection); | |
| d3.json("lakes-topo.json", function(error, data) { | |
| var lakes = topojson.object(data, data.objects.lakes); | |
| svg.append("image") | |
| .attr("xlink:href", "hill-relief.jpg") | |
| .attr("width", width) | |
| .attr("height", height) | |
| .attr("class", "bg"); | |
| svg.selectAll(".lake") | |
| .data(lakes.geometries) | |
| .enter().append("path") | |
| .attr("d", path) | |
| .attr("class", "lake") | |
| .attr("id", "superior"); // There is only one lake in this set. | |
| svg.append("clipPath") | |
| .attr("id", "clip") | |
| .append("use") | |
| .attr("xlink:href", "#superior"); | |
| svg.append("image") | |
| .attr("clip-path", "url(#clip)") | |
| .attr("xlink:href", "superior.jpg") | |
| .attr("width", width) | |
| .attr("height", height) | |
| .attr("class", "bg"); | |
| }); | |
| </script> |
