dnseminara/index.html

## index.html
<!DOCTYPE html>
<meta charset="utf-8">
<style>

.states {
  fill: #99CCFF;
  stroke: #fff;
}

.symbol {
  fill: #FFCC33;
  fill-opacity: .7;
  stroke: #666666;
}

.symbol:hover {
  fill: #CC9900;
  fill-opacity: .9;
  stroke: #000000;
}

.d3-tip {
  line-height: 1;
  font-weight: bold;
  padding: 6px;
  background: rgba(0, 0, 0, 0.8);
  color: #fff;
  border-radius: 2px;
  max-width: 250px;
  text-align: center;
}

.d3-tip:after {
  box-sizing: border-box;
  display: inline;
  font-size: 10px;
  width: 100%;
  line-height: 1;
  color: rgba(0, 0, 0, 0.8);
  content: "\25BC";
  position: absolute;
  text-align: center;
}

.d3-tip.n:after {
  margin: -1px 0 0 0;
  top: 100%;
  left: 0;
}


</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://labratrevenge.com/d3-tip/javascripts/d3.tip.v0.6.3.js"></script>
<script src="http://d3js.org/queue.v1.min.js"></script>
<script>

var width = 960,
    height = 600;

var radius = d3.scale.sqrt()
    .domain([0, 750])
    .range([0, 12]);

var tip = d3.tip().attr('class', 'd3-tip').html(function(d) { return d.properties.NAMELSAD.replace(" Metro Area", "") + ": " + (d.properties.metro)/100 + "%"; });

var path = d3.geo.path();

var svg = d3.select("body").append("svg")
    .attr("width", width)
    .attr("height", height);

queue()
    .defer(d3.json, "us.json")
    .defer(d3.json, "msa.json")
    .await(ready);

function ready(error, us, msa) {
  svg.append("path")
      .attr("class", "states")
      .datum(topojson.feature(us, us.objects.us_states))
      .attr("d", path);

  svg.call(tip)

  svg.selectAll(".symbol")
      .data(msa.features.sort(function(a, b) { return b.properties.metro - a.properties.metro; }))
    .enter().append("path")
      .attr("class", "symbol")
      .attr("d", path.pointRadius(function(d) { return radius(d.properties.metro); }))
      .on("mouseover", tip.show)
      .on("mouseout", tip.hide)
}

</script>

## msa.json
{
"type": "FeatureCollection",

"features": [
{ "type": "Feature", "properties": { "GEOID": "39580", "NAMELSAD": "Raleigh, NC Metro Area", "INTPTLAT": "+35.7567464", "INTPTLON": "-078.4604412", "metro": 394 }, "geometry": { "type": "Point", "coordinates": [ -78.460802989035514, 35.757134383374883 ] } },
{ "type": "Feature", "properties": { "GEOID": "40380", "NAMELSAD": "Rochester, NY Metro Area", "INTPTLAT": "+43.1480380", "INTPTLON": "-077.5232575", "metro": 670 }, "geometry": { "type": "Point", "coordinates": [ -77.522073013357698, 43.149075553423472 ] } },
{ "type": "Feature", "properties": { "GEOID": "40060", "NAMELSAD": "Richmond, VA Metro Area", "INTPTLAT": "+37.4634618", "INTPTLON": "-077.4751772", "metro": 448 }, "geometry": { "type": "Point", "coordinates": [ -77.473156649954959, 37.461857586884683 ] } },
{ "type": "Feature", "properties": { "GEOID": "40140", "NAMELSAD": "Riverside-San Bernardino-Ontario, CA Metro Area", "INTPTLAT": "+34.5375344", "INTPTLON": "-116.1309212", "metro": 498 }, "geometry": { "type": "Point", "coordinates": [ -116.129731695857686, 34.551682405201781 ] } },
{ "type": "Feature", "properties": { "GEOID": "41860", "NAMELSAD": "San Francisco-Oakland-Hayward, CA Metro Area", "INTPTLAT": "+37.7737185", "INTPTLON": "-122.2744317", "metro": 2390 }, "geometry": { "type": "Point", "coordinates": [ -122.274114251350639, 37.77410824554326 ] } },
{ "type": "Feature", "properties": { "GEOID": "40900", "NAMELSAD": "Sacramento--Roseville--Arden-Arcade, CA Metro Area", "INTPTLAT": "+38.7896779", "INTPTLON": "-121.0057504", "metro": 812 }, "geometry": { "type": "Point", "coordinates": [ -120.997631759611465, 38.780462958543744 ] } },
{ "type": "Feature", "properties": { "GEOID": "41940", "NAMELSAD": "San Jose-Sunnyvale-Santa Clara, CA Metro Area", "INTPTLAT": "+36.9084718", "INTPTLON": "-121.3713721", "metro": 846 }, "geometry": { "type": "Point", "coordinates": [ -121.376935549209435, 36.910311248877377 ] } },
{ "type": "Feature", "properties": { "GEOID": "41180", "NAMELSAD": "St. Louis, MO-IL Metro Area", "INTPTLAT": "+38.7404035", "INTPTLON": "-090.3459564", "metro": 552 }, "geometry": { "type": "Point", "coordinates": [ -90.350104945930781, 38.735268722807575 ] } },
{ "type": "Feature", "properties": { "GEOID": "41620", "NAMELSAD": "Salt Lake City, UT Metro Area", "INTPTLAT": "+40.5225926", "INTPTLON": "-112.9605168", "metro": 788 }, "geometry": { "type": "Point", "coordinates": [ -113.010307196715587, 40.470638249600221 ] } },
{ "type": "Feature", "properties": { "GEOID": "41700", "NAMELSAD": "San Antonio-New Braunfels, TX Metro Area", "INTPTLAT": "+29.4330599", "INTPTLON": "-098.6069734", "metro": 562 }, "geometry": { "type": "Point", "coordinates": [ -98.602263603859484, 29.428764010690767 ] } },
{ "type": "Feature", "properties": { "GEOID": "41740", "NAMELSAD": "San Diego-Carlsbad, CA Metro Area", "INTPTLAT": "+33.0236041", "INTPTLON": "-116.7761174", "metro": 803 }, "geometry": { "type": "Point", "coordinates": [ -116.770207442419746, 33.028203200304617 ] } },
{ "type": "Feature", "properties": { "GEOID": "42660", "NAMELSAD": "Seattle-Tacoma-Bellevue, WA Metro Area", "INTPTLAT": "+47.5530503", "INTPTLON": "-121.8831653", "metro": 1480 }, "geometry": { "type": "Point", "coordinates": [ -121.881387432257043, 47.557403343077361 ] } },
{ "type": "Feature", "properties": { "GEOID": "45300", "NAMELSAD": "Tampa-St. Petersburg-Clearwater, FL Metro Area", "INTPTLAT": "+28.1259071", "INTPTLON": "-082.4652858", "metro": 531 }, "geometry": { "type": "Point", "coordinates": [ -82.464039406759298, 28.125538826943568 ] } },
{ "type": "Feature", "properties": { "GEOID": "46060", "NAMELSAD": "Tucson, AZ Metro Area", "INTPTLAT": "+32.1285226", "INTPTLON": "-111.7830267", "metro": 884 }, "geometry": { "type": "Point", "coordinates": [ -111.789949310007387, 32.097379021090497 ] } },
{ "type": "Feature", "properties": { "GEOID": "46140", "NAMELSAD": "Tulsa, OK Metro Area", "INTPTLAT": "+36.2541502", "INTPTLON": "-096.1749783", "metro": 319 }, "geometry": { "type": "Point", "coordinates": [ -96.166259448865006, 36.250429094878186 ] } },
{ "type": "Feature", "properties": { "GEOID": "46520", "NAMELSAD": "Urban Honolulu, HI Metro Area", "INTPTLAT": "+21.4613654", "INTPTLON": "-158.2019740", "metro": 1800 }, "geometry": { "type": "Point", "coordinates": [ -158.033935134552678, 21.476504850019822 ] } },
{ "type": "Feature", "properties": { "GEOID": "47260", "NAMELSAD": "Virginia Beach-Norfolk-Newport News, VA-NC Metro Area", "INTPTLAT": "+36.8560812", "INTPTLON": "-076.3737908", "metro": 652 }, "geometry": { "type": "Point", "coordinates": [ -76.375492779369992, 36.85748687782543 ] } },
{ "type": "Feature", "properties": { "GEOID": "47900", "NAMELSAD": "Washington-Arlington-Alexandria, DC-VA-MD-WV Metro Area", "INTPTLAT": "+38.8169283", "INTPTLON": "-077.4482275", "metro": 2000 }, "geometry": { "type": "Point", "coordinates": [ -77.448058123629039, 38.817092265361673 ] } },
{ "type": "Feature", "properties": { "GEOID": "49340", "NAMELSAD": "Worcester, MA-CT Metro Area", "INTPTLAT": "+42.2173112", "INTPTLON": "-071.9255354", "metro": 558 }, "geometry": { "type": "Point", "coordinates": [ -71.927408953845742, 42.222807066626444 ] } },
{ "type": "Feature", "properties": { "GEOID": "34980", "NAMELSAD": "Nashville-Davidson--Murfreesboro--Franklin, TN Metro Area", "INTPTLAT": "+36.0885065", "INTPTLON": "-086.7266015", "metro": 369 }, "geometry": { "type": "Point", "coordinates": [ -86.724437999373407, 36.089092742641675 ] } },
{ "type": "Feature", "properties": { "GEOID": "35300", "NAMELSAD": "New Haven-Milford, CT Metro Area", "INTPTLAT": "+41.3497173", "INTPTLON": "-072.9002037", "metro": 920 }, "geometry": { "type": "Point", "coordinates": [ -72.899859707587922, 41.348822550273873 ] } },
{ "type": "Feature", "properties": { "GEOID": "35380", "NAMELSAD": "New Orleans-Metairie, LA Metro Area", "INTPTLAT": "+29.8055320", "INTPTLON": "-089.7013821", "metro": 830 }, "geometry": { "type": "Point", "coordinates": [ -89.708364307214794, 29.809400149049662 ] } },
{ "type": "Feature", "properties": { "GEOID": "35620", "NAMELSAD": "New York-Newark-Jersey City, NY-NJ-PA Metro Area", "INTPTLAT": "+40.8988679", "INTPTLON": "-073.9033283", "metro": 4070 }, "geometry": { "type": "Point", "coordinates": [ -73.902395999440103, 40.898384580007338 ] } },
{ "type": "Feature", "properties": { "GEOID": "36420", "NAMELSAD": "Oklahoma City, OK Metro Area", "INTPTLAT": "+35.4309676", "INTPTLON": "-097.5069659", "metro": 360 }, "geometry": { "type": "Point", "coordinates": [ -97.503881467042248, 35.429867917639569 ] } },
{ "type": "Feature", "properties": { "GEOID": "36540", "NAMELSAD": "Omaha-Council Bluffs, NE-IA Metro Area", "INTPTLAT": "+41.2904587", "INTPTLON": "-095.9999701", "metro": 381 }, "geometry": { "type": "Point", "coordinates": [ -95.999124444757598, 41.290084196620519 ] } },
{ "type": "Feature", "properties": { "GEOID": "36740", "NAMELSAD": "Orlando-Kissimmee-Sanford, FL Metro Area", "INTPTLAT": "+28.4343480", "INTPTLON": "-081.3558764", "metro": 548 }, "geometry": { "type": "Point", "coordinates": [ -81.363052912706337, 28.434350043451545 ] } },
{ "type": "Feature", "properties": { "GEOID": "37100", "NAMELSAD": "Oxnard-Thousand Oaks-Ventura, CA Metro Area", "INTPTLAT": "+34.3587415", "INTPTLON": "-119.1331432", "metro": 571 }, "geometry": { "type": "Point", "coordinates": [ -119.126027208604924, 34.357528524362287 ] } },
{ "type": "Feature", "properties": { "GEOID": "37980", "NAMELSAD": "Philadelphia-Camden-Wilmington, PA-NJ-DE-MD Metro Area", "INTPTLAT": "+39.8951304", "INTPTLON": "-075.3120032", "metro": 1500 }, "geometry": { "type": "Point", "coordinates": [ -75.311787897790651, 39.895833941799332 ] } },
{ "type": "Feature", "properties": { "GEOID": "38060", "NAMELSAD": "Phoenix-Mesa-Scottsdale, AZ Metro Area", "INTPTLAT": "+33.1857653", "INTPTLON": "-112.0678624", "metro": 646 }, "geometry": { "type": "Point", "coordinates": [ -112.070487845738612, 33.185704078901402 ] } },
{ "type": "Feature", "properties": { "GEOID": "38300", "NAMELSAD": "Pittsburgh, PA Metro Area", "INTPTLAT": "+40.4343378", "INTPTLON": "-079.8280615", "metro": 1060 }, "geometry": { "type": "Point", "coordinates": [ -79.83096065932564, 40.439015188455798 ] } },
{ "type": "Feature", "properties": { "GEOID": "38900", "NAMELSAD": "Portland-Vancouver-Hillsboro, OR-WA Metro Area", "INTPTLAT": "+45.6006204", "INTPTLON": "-122.4843457", "metro": 1380 }, "geometry": { "type": "Point", "coordinates": [ -122.478566084922448, 45.598167331282625 ] } },
{ "type": "Feature", "properties": { "GEOID": "39300", "NAMELSAD": "Providence-Warwick, RI-MA Metro Area", "INTPTLAT": "+41.7016138", "INTPTLON": "-071.2892856", "metro": 749 }, "geometry": { "type": "Point", "coordinates": [ -71.389666833839826, 41.644935455420551 ] } },
{ "type": "Feature", "properties": { "GEOID": "10580", "NAMELSAD": "Albany-Schenectady-Troy, NY Metro Area", "INTPTLAT": "+42.7879202", "INTPTLON": "-073.9423479", "metro": 427 }, "geometry": { "type": "Point", "coordinates": [ -73.941975614077649, 42.788504738628539 ] } },
{ "type": "Feature", "properties": { "GEOID": "10740", "NAMELSAD": "Albuquerque, NM Metro Area", "INTPTLAT": "+35.1166033", "INTPTLON": "-106.4565347", "metro": 614 }, "geometry": { "type": "Point", "coordinates": [ -106.471626764828855, 35.122355935690067 ] } },
{ "type": "Feature", "properties": { "GEOID": "10900", "NAMELSAD": "Allentown-Bethlehem-Easton, PA-NJ Metro Area", "INTPTLAT": "+40.7893392", "INTPTLON": "-075.3981580", "metro": 503 }, "geometry": { "type": "Point", "coordinates": [ -75.403653518524479, 40.789392978457371 ] } },
{ "type": "Feature", "properties": { "GEOID": "19740", "NAMELSAD": "Denver-Aurora-Lakewood, CO Metro Area", "INTPTLAT": "+39.4347492", "INTPTLON": "-104.9012090", "metro": 899 }, "geometry": { "type": "Point", "coordinates": [ -104.894408268668073, 39.43370962043624 ] } },
{ "type": "Feature", "properties": { "GEOID": "19820", "NAMELSAD": "Detroit-Warren-Dearborn, MI Metro Area", "INTPTLAT": "+42.7218478", "INTPTLON": "-083.2008463", "metro": 409 }, "geometry": { "type": "Point", "coordinates": [ -83.205815931284377, 42.716194376448485 ] } },
{ "type": "Feature", "properties": { "GEOID": "31080", "NAMELSAD": "Los Angeles-Long Beach-Anaheim, CA Metro Area", "INTPTLAT": "+34.1090244", "INTPTLON": "-118.1825492", "metro": 1130 }, "geometry": { "type": "Point", "coordinates": [ -118.180768229654973, 34.111758448146468 ] } },
{ "type": "Feature", "properties": { "GEOID": "31140", "NAMELSAD": "Louisville\/Jefferson County, KY-IN Metro Area", "INTPTLAT": "+38.3352396", "INTPTLON": "-085.6689414", "metro": 477 }, "geometry": { "type": "Point", "coordinates": [ -85.670847641667862, 38.336749289535163 ] } },
{ "type": "Feature", "properties": { "GEOID": "32580", "NAMELSAD": "McAllen-Edinburg-Mission, TX Metro Area", "INTPTLAT": "+26.3963839", "INTPTLON": "-098.1809900", "metro": 580 }, "geometry": { "type": "Point", "coordinates": [ -98.181070506384415, 26.396720586912139 ] } },
{ "type": "Feature", "properties": { "GEOID": "32820", "NAMELSAD": "Memphis, TN-MS-AR Metro Area", "INTPTLAT": "+35.0085568", "INTPTLON": "-089.8218159", "metro": 363 }, "geometry": { "type": "Point", "coordinates": [ -89.815246226175816, 35.007674457965301 ] } },
{ "type": "Feature", "properties": { "GEOID": "33100", "NAMELSAD": "Miami-Fort Lauderdale-West Palm Beach, FL Metro Area", "INTPTLAT": "+26.1018281", "INTPTLON": "-080.4787552", "metro": 793 }, "geometry": { "type": "Point", "coordinates": [ -80.465201835168614, 26.131064638780718 ] } },
{ "type": "Feature", "properties": { "GEOID": "33340", "NAMELSAD": "Milwaukee-Waukesha-West Allis, WI Metro Area", "INTPTLAT": "+43.0176524", "INTPTLON": "-087.4815485", "metro": 788 }, "geometry": { "type": "Point", "coordinates": [ -87.796987868801267, 43.180392771180777 ] } },
{ "type": "Feature", "properties": { "GEOID": "33460", "NAMELSAD": "Minneapolis-St. Paul-Bloomington, MN-WI Metro Area", "INTPTLAT": "+45.0611963", "INTPTLON": "-093.3515743", "metro": 889 }, "geometry": { "type": "Point", "coordinates": [ -93.345570510475156, 45.064995702296173 ] } },
{ "type": "Feature", "properties": { "GEOID": "21340", "NAMELSAD": "El Paso, TX Metro Area", "INTPTLAT": "+31.5273940", "INTPTLON": "-105.5213326", "metro": 708 }, "geometry": { "type": "Point", "coordinates": [ -105.541003104881838, 31.513079660524998 ] } },
{ "type": "Feature", "properties": { "GEOID": "23420", "NAMELSAD": "Fresno, CA Metro Area", "INTPTLAT": "+36.7610058", "INTPTLON": "-119.6550193", "metro": 738 }, "geometry": { "type": "Point", "coordinates": [ -119.649319951500914, 36.758179189242341 ] } },
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{ "type": "Feature", "properties": { "GEOID": "25540", "NAMELSAD": "Hartford-West Hartford-East Hartford, CT Metro Area", "INTPTLAT": "+41.7186010", "INTPTLON": "-072.5739417", "metro": 779 }, "geometry": { "type": "Point", "coordinates": [ -72.572684859727957, 41.71810337728531 ] } },
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{ "type": "Feature", "properties": { "GEOID": "28140", "NAMELSAD": "Kansas City, MO-KS Metro Area", "INTPTLAT": "+38.9318528", "INTPTLON": "-094.4438224", "metro": 373 }, "geometry": { "type": "Point", "coordinates": [ -94.444398310058418, 38.937183357418093 ] } },
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{ "type": "Feature", "properties": { "GEOID": "12540", "NAMELSAD": "Bakersfield, CA Metro Area", "INTPTLAT": "+35.3466288", "INTPTLON": "-118.7295064", "metro": 569 }, "geometry": { "type": "Point", "coordinates": [ -118.729900018248841, 35.342848714597601 ] } },
{ "type": "Feature", "properties": { "GEOID": "12580", "NAMELSAD": "Baltimore-Columbia-Towson, MD Metro Area", "INTPTLAT": "+39.3043610", "INTPTLON": "-076.5495009", "metro": 1040 }, "geometry": { "type": "Point", "coordinates": [ -76.551007988431138, 39.305542207758641 ] } },
{ "type": "Feature", "properties": { "GEOID": "12940", "NAMELSAD": "Baton Rouge, LA Metro Area", "INTPTLAT": "+30.5708895", "INTPTLON": "-091.1345330", "metro": 415 }, "geometry": { "type": "Point", "coordinates": [ -91.132783976727126, 30.571050002831672 ] } },
{ "type": "Feature", "properties": { "GEOID": "13820", "NAMELSAD": "Birmingham-Hoover, AL Metro Area", "INTPTLAT": "+33.4623718", "INTPTLON": "-086.8143378", "metro": 239 }, "geometry": { "type": "Point", "coordinates": [ -86.813868045852502, 33.463840857510689 ] } },
{ "type": "Feature", "properties": { "GEOID": "14460", "NAMELSAD": "Boston-Cambridge-Newton, MA-NH Metro Area", "INTPTLAT": "+42.5176060", "INTPTLON": "-071.0219925", "metro": 1980 }, "geometry": { "type": "Point", "coordinates": [ -71.021990197940923, 42.518153851619928 ] } },
{ "type": "Feature", "properties": { "GEOID": "14860", "NAMELSAD": "Bridgeport-Stamford-Norwalk, CT Metro Area", "INTPTLAT": "+41.2274198", "INTPTLON": "-073.3669880", "metro": 1290 }, "geometry": { "type": "Point", "coordinates": [ -73.37120443201664, 41.224960191640776 ] } },
{ "type": "Feature", "properties": { "GEOID": "15380", "NAMELSAD": "Buffalo-Cheektowaga-Niagara Falls, NY Metro Area", "INTPTLAT": "+43.0443711", "INTPTLON": "-078.7773351", "metro": 805 }, "geometry": { "type": "Point", "coordinates": [ -78.775384400085997, 43.037867795251707 ] } },
{ "type": "Feature", "properties": { "GEOID": "16740", "NAMELSAD": "Charlotte-Concord-Gastonia, NC-SC Metro Area", "INTPTLAT": "+35.1872950", "INTPTLON": "-080.8674907", "metro": 497 }, "geometry": { "type": "Point", "coordinates": [ -80.867207470986827, 35.188923341469199 ] } },
{ "type": "Feature", "properties": { "GEOID": "16980", "NAMELSAD": "Chicago-Naperville-Elgin, IL-IN-WI Metro Area", "INTPTLAT": "+41.8235214", "INTPTLON": "-087.8282967", "metro": 1690 }, "geometry": { "type": "Point", "coordinates": [ -87.829624669049196, 41.824838709374227 ] } },
{ "type": "Feature", "properties": { "GEOID": "17140", "NAMELSAD": "Cincinnati, OH-KY-IN Metro Area", "INTPTLAT": "+39.0694009", "INTPTLON": "-084.4271451", "metro": 498 }, "geometry": { "type": "Point", "coordinates": [ -84.427493336625446, 39.071541564966168 ] } },
{ "type": "Feature", "properties": { "GEOID": "17460", "NAMELSAD": "Cleveland-Elyria, OH Metro Area", "INTPTLAT": "+41.7603920", "INTPTLON": "-081.7242168", "metro": 686 }, "geometry": { "type": "Point", "coordinates": [ -81.661214239916973, 41.592367252239413 ] } },
{ "type": "Feature", "properties": { "GEOID": "17900", "NAMELSAD": "Columbia, SC Metro Area", "INTPTLAT": "+34.0841749", "INTPTLON": "-081.0405974", "metro": 645 }, "geometry": { "type": "Point", "coordinates": [ -81.042437085707448, 34.091758975565426 ] } },
{ "type": "Feature", "properties": { "GEOID": "18140", "NAMELSAD": "Columbus, OH Metro Area", "INTPTLAT": "+39.9685617", "INTPTLON": "-082.8359105", "metro": 539 }, "geometry": { "type": "Point", "coordinates": [ -82.836781123688297, 39.96813081160348 ] } },
{ "type": "Feature", "properties": { "GEOID": "19100", "NAMELSAD": "Dallas-Fort Worth-Arlington, TX Metro Area", "INTPTLAT": "+32.8225581", "INTPTLON": "-097.0251332", "metro": 427 }, "geometry": { "type": "Point", "coordinates": [ -97.025190425693879, 32.818151145263691 ] } },
{ "type": "Feature", "properties": { "GEOID": "19380", "NAMELSAD": "Dayton, OH Metro Area", "INTPTLAT": "+39.8288538", "INTPTLON": "-084.1418129", "metro": 560 }, "geometry": { "type": "Point", "coordinates": [ -84.141938851185401, 39.829461088338668 ] } }
]
}

## us.json

      
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              us.json
            
          
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	<!DOCTYPE html>
	<meta charset="utf-8">
	<style>

	.states {
	fill: #99CCFF;
	stroke: #fff;
	}

	.symbol {
	fill: #FFCC33;
	fill-opacity: .7;
	stroke: #666666;
	}

	.symbol:hover {
	fill: #CC9900;
	fill-opacity: .9;
	stroke: #000000;
	}

	.d3-tip {
	line-height: 1;
	font-weight: bold;
	padding: 6px;
	background: rgba(0, 0, 0, 0.8);
	color: #fff;
	border-radius: 2px;
	max-width: 250px;
	text-align: center;
	}

	.d3-tip:after {
	box-sizing: border-box;
	display: inline;
	font-size: 10px;
	width: 100%;
	line-height: 1;
	color: rgba(0, 0, 0, 0.8);
	content: "\25BC";
	position: absolute;
	text-align: center;
	}

	.d3-tip.n:after {
	margin: -1px 0 0 0;
	top: 100%;
	left: 0;
	}



	</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://labratrevenge.com/d3-tip/javascripts/d3.tip.v0.6.3.js"></script>
	<script src="http://d3js.org/queue.v1.min.js"></script>
	<script>

	var width = 960,
	height = 600;

	var radius = d3.scale.sqrt()
	.domain([0, 750])
	.range([0, 12]);

	var tip = d3.tip().attr('class', 'd3-tip').html(function(d) { return d.properties.NAMELSAD.replace(" Metro Area", "") + ": " + (d.properties.metro)/100 + "%"; });

	var path = d3.geo.path();

	var svg = d3.select("body").append("svg")
	.attr("width", width)
	.attr("height", height);

	queue()
	.defer(d3.json, "us.json")
	.defer(d3.json, "msa.json")
	.await(ready);

	function ready(error, us, msa) {
	svg.append("path")
	.attr("class", "states")
	.datum(topojson.feature(us, us.objects.us_states))
	.attr("d", path);

	svg.call(tip)

	svg.selectAll(".symbol")
	.data(msa.features.sort(function(a, b) { return b.properties.metro - a.properties.metro; }))
	.enter().append("path")
	.attr("class", "symbol")
	.attr("d", path.pointRadius(function(d) { return radius(d.properties.metro); }))
	.on("mouseover", tip.show)
	.on("mouseout", tip.hide)
	}

	</script>
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