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April 27, 2017 22:15
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second try Project
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| license: mit |
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| <!DOCTYPE html> | |
| <meta charset='utf-8'> | |
| <body> | |
| <script src="//d3js.org/d3.v4.min.js"></script> | |
| <script src="//d3js.org/topojson.v2.min.js"></script> | |
| <script src="//d3js.org/d3-scale-chromatic.v1.min.js"></script> | |
| <script> | |
| var width=960, height=500; | |
| var svg = d3.select('body').append('svg') | |
| .attr('width', width) | |
| .attr('height', height); | |
| var threshold = d3.scaleThreshold() | |
| .domain([1, 10, 50, 200, 800, 2000, 5000, 10000]) | |
| .range(d3.schemeOrRd[9]) | |
| var population = d3.map(); | |
| var data = "https://raw.githubusercontent.com/sabeehtaqi/classes/master/PopulationEstimatesProject.csv"; | |
| d3.queue() | |
| .defer(d3.json, 'https://umbcvis.github.io/classes/class-12/tracts.json') | |
| .defer(d3.json, data, function(d) { population.set(d.FIPS, +d.POP_ESTIMATE_2010); }) | |
| .await(ready); | |
| var projection = d3.geoConicConformal() | |
| .parallels([38 + 18 / 60, 39 + 27 / 60]) | |
| .rotate([77, -37 -40 / 60]); | |
| var path = d3.geoPath() | |
| .projection(projection); | |
| function ready(error, json, population) { | |
| if (error) throw error; | |
| geojson = topojson.feature(json, json.objects.tracts); | |
| tracts = geojson.features; | |
| projection.fitSize([960, 500], geojson); | |
| tracts.forEach(function(tract) { | |
| var countyfips = tract.properties.COUNTYFP; | |
| var tractce = tract.properties.TRACTCE; | |
| pop = population.filter(function(d) {return (d[2] === countyfips) | |
| && (d[3] === tractce); | |
| }); | |
| pop = +pop[0][0]; | |
| var aland = tract.properties.ALAND / 2589975.2356; // area in square miles | |
| tract.properties.density = pop / aland; | |
| }); | |
| svg.selectAll('path.tract') | |
| .data(tracts) | |
| .enter() | |
| .append('path') | |
| .attr('class', 'tract') | |
| .attr('d', path) | |
| .style('fill', function(d) {return threshold(d.properties.density);}) | |
| .style('stroke', '#000') | |
| } | |
| </script> |
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