Practice making a small map of the United States. Adapted from many resources, including this base map. Process described here with additional references.
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September 8, 2015 03:37
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Example map of the US
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| <!DOCTYPE html> | |
| <meta charset="utf-8"> | |
| <style> | |
| path { | |
| fill: #ccc; | |
| stroke: none; | |
| } | |
| .cities{ | |
| fill: blue; | |
| } | |
| </style> | |
| <body> | |
| <script src="http://d3js.org/d3.v3.min.js"></script> | |
| <script src="http://d3js.org/topojson.v1.min.js"></script> | |
| <script src="smallMap.js"></script> |
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| var width = 960, | |
| height = 500; | |
| // defines size of map, and location on the screen | |
| var projection = d3.geo.albersUsa() | |
| .translate([100,100]) | |
| .scale([200]); | |
| var path = d3.geo.path().projection(projection); | |
| // list of cities to show, and locations | |
| var citiesData = [{"city": "Chicago", location: {"lat": 41.87811, "long": -87.62980}}, | |
| {"city": "New Orleans", location: {"lat": 29.95107 , "long": -90.07153}}, | |
| {"city": "Seattle", location: {"lat": 47.60621, "long": -122.33207}}, | |
| {"city": "Boston", location: {"lat": 42.35849, "long": -71.06010}}]; | |
| // normal svg setup | |
| var svg = d3.select("body").append("svg") | |
| .attr("width", width) | |
| .attr("height", height); | |
| // read in US geometry | |
| d3.json("us.json", function(error, topology) { | |
| // limit to continental US | |
| topology.objects.cb_2013_us_state_20m.geometries = | |
| topology.objects.cb_2013_us_state_20m.geometries.filter( | |
| function(d){if(["Alaska", "Hawaii", "Puerto Rico"].indexOf(d.id) == -1){return d}} | |
| ) | |
| // attach path for US boundary | |
| svg.append("path") | |
| .datum(topojson.feature(topology, topology.objects.cb_2013_us_state_20m)) | |
| .attr("d", path); | |
| // append cities | |
| svg.append("g") | |
| .attr("class", "cities") | |
| .selectAll("circle") | |
| .data(citiesData) | |
| .enter().append("circle") | |
| .attr("transform", function(d) { | |
| return "translate(" + projection([ | |
| d.location.long, | |
| d.location.lat | |
| ]) + ")" | |
| }) | |
| .attr("r", 3); | |
| }); |
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