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Basic US State Map - D3
years place lat lon
2 New York City 40.71455 -74.007124
6 San Francisco 37.7771187 -122.4196396
8 Santa Cruz 36.9740181 -122.0309525
3 Santa Barbara 34.4193802 -119.6990509
10 Tucson 32.22155 -110.9697571
1 Washington DC 38.8903694 -77.0319595
<!DOCTYPE html>
<html lang="en">
<head>
<meta charset="utf-8">
<script src="http://d3js.org/d3.v3.min.js"></script>
<style type="text/css">
/* On mouse hover, lighten state color */
path:hover {
fill-opacity: .7;
}
/* Style for Custom Tooltip */
div.tooltip {
position: absolute;
text-align: center;
width: 60px;
height: 28px;
padding: 2px;
font: 12px sans-serif;
background: white;
border: 0px;
border-radius: 8px;
pointer-events: none;
}
/* Legend Font Style */
body {
font: 11px sans-serif;
}
/* Legend Position Style */
.legend {
position:absolute;
left:800px;
top:350px;
}
</style>
</head>
<body>
<script type="text/javascript">
/* This visualization was made possible by modifying code provided by:
Scott Murray, Choropleth example from "Interactive Data Visualization for the Web"
https://github.com/alignedleft/d3-book/blob/master/chapter_12/05_choropleth.html
Malcolm Maclean, tooltips example tutorial
http://www.d3noob.org/2013/01/adding-tooltips-to-d3js-graph.html
Mike Bostock, Pie Chart Legend
http://bl.ocks.org/mbostock/3888852 */
//Width and height of map
var width = 960;
var height = 500;
// D3 Projection
var projection = d3.geo.albersUsa()
.translate([width/2, height/2]) // translate to center of screen
.scale([1000]); // scale things down so see entire US
// Define path generator
var path = d3.geo.path() // path generator that will convert GeoJSON to SVG paths
.projection(projection); // tell path generator to use albersUsa projection
// Define linear scale for output
var color = d3.scale.linear()
.range(["rgb(213,222,217)","rgb(69,173,168)","rgb(84,36,55)","rgb(217,91,67)"]);
var legendText = ["Cities Lived", "States Lived", "States Visited", "Nada"];
//Create SVG element and append map to the SVG
var svg = d3.select("body")
.append("svg")
.attr("width", width)
.attr("height", height);
// Append Div for tooltip to SVG
var div = d3.select("body")
.append("div")
.attr("class", "tooltip")
.style("opacity", 0);
// Load in my states data!
d3.csv("stateslived.csv", function(data) {
color.domain([0,1,2,3]); // setting the range of the input data
// Load GeoJSON data and merge with states data
d3.json("us-states.json", function(json) {
// Loop through each state data value in the .csv file
for (var i = 0; i < data.length; i++) {
// Grab State Name
var dataState = data[i].state;
// Grab data value
var dataValue = data[i].visited;
// Find the corresponding state inside the GeoJSON
for (var j = 0; j < json.features.length; j++) {
var jsonState = json.features[j].properties.name;
if (dataState == jsonState) {
// Copy the data value into the JSON
json.features[j].properties.visited = dataValue;
// Stop looking through the JSON
break;
}
}
}
// Bind the data to the SVG and create one path per GeoJSON feature
svg.selectAll("path")
.data(json.features)
.enter()
.append("path")
.attr("d", path)
.style("stroke", "#fff")
.style("stroke-width", "1")
.style("fill", function(d) {
// Get data value
var value = d.properties.visited;
if (value) {
//If value exists…
return color(value);
} else {
//If value is undefined…
return "rgb(213,222,217)";
}
});
// Map the cities I have lived in!
d3.csv("cities-lived.csv", function(data) {
svg.selectAll("circle")
.data(data)
.enter()
.append("circle")
.attr("cx", function(d) {
return projection([d.lon, d.lat])[0];
})
.attr("cy", function(d) {
return projection([d.lon, d.lat])[1];
})
.attr("r", function(d) {
return Math.sqrt(d.years) * 4;
})
.style("fill", "rgb(217,91,67)")
.style("opacity", 0.85)
// Modification of custom tooltip code provided by Malcolm Maclean, "D3 Tips and Tricks"
// http://www.d3noob.org/2013/01/adding-tooltips-to-d3js-graph.html
.on("mouseover", function(d) {
div.transition()
.duration(200)
.style("opacity", .9);
div.text(d.place)
.style("left", (d3.event.pageX) + "px")
.style("top", (d3.event.pageY - 28) + "px");
})
// fade out tooltip on mouse out
.on("mouseout", function(d) {
div.transition()
.duration(500)
.style("opacity", 0);
});
});
// Modified Legend Code from Mike Bostock: http://bl.ocks.org/mbostock/3888852
var legend = d3.select("body").append("svg")
.attr("class", "legend")
.attr("width", 140)
.attr("height", 200)
.selectAll("g")
.data(color.domain().slice().reverse())
.enter()
.append("g")
.attr("transform", function(d, i) { return "translate(0," + i * 20 + ")"; });
legend.append("rect")
.attr("width", 18)
.attr("height", 18)
.style("fill", color);
legend.append("text")
.data(legendText)
.attr("x", 24)
.attr("y", 9)
.attr("dy", ".35em")
.text(function(d) { return d; });
});
});
</script>
</body>
</html>
state visited
Alabama 0
Alaska 0
Arkansas 0
Arizona 2
California 2
Colorado 1
Connecticut 1
Delaware 0
Florida 0
Georgia 0
Hawaii 0
Iowa 0
Idaho 1
Illinois 1
Indiana 0
Kansas 0
Kentucky 0
Louisiana 0
Maine 1
Maryland 1
Massachusetts 1
Michigan 0
Minnesota 1
Missouri 0
Mississippi 0
Montana 1
North Carolina 0
North Dakota 0
Nebraska 0
New Hampshire 1
New Jersey 0
New Mexico 1
Nevada 1
New York 2
Ohio 1
Oklahoma 0
Oregon 1
Pennsylvania 1
Rhode Island 1
South Carolina 0
South Dakota 0
Tennessee 0
Texas 0
Utah 1
Virginia 0
Vermont 0
Washington 1
Wisconsin 0
West Virginia 0
Wyoming 1
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@alexbaur

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@alexbaur alexbaur commented Jul 27, 2017

@michellechandra Thank you for writing such informative code! I found this originally at http://bl.ocks.org/michellechandra/0b2ce4923dc9b5809922 and it has been a big help in getting me acquainted with D3.

I was wondering if you'd be willing to let me license your code, I am working on some projects for my job and would love to use your methods. Let me know if you would like more details!

@jharden1990

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@jharden1990 jharden1990 commented Nov 1, 2019

@michellechandra Thank you as well for your informative code! I, too, am wondering if you'd be willing to let me license your code.

@georgesb

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@georgesb georgesb commented May 2, 2020

@michellechandra Thank you for this beautiful D3 example! Would it be okay to modify and re-use as an example for high school students? I mostly work with p5.js, but this would be a lovely intro into D3.
ps Just saw your website. I'm a huge Susan Sontag fan. We both went to North Hollywood High. Huge fan of Dan Shiffman of NYU as well.

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@michellechandra michellechandra commented May 2, 2020

@georgesb - sure, no problem! very cool you went to high school with Susan Sontag!

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@georgesb georgesb commented May 2, 2020

Thank you, Michelle! I’ll enjoy learning some D3 with your project! I’m a bit younger than Susan Sontag. 20 years to be exact. She would be 87 now if she were alive. So I never actually met her, but I got into reading her when I was quite young and it was exciting to learn later that she and I had attended the same high school. I'm a semi-retired LAUSD educator and I like to bring in literature and the arts in my CS classes. My website: https://georgesb.com Thanks again!

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