I'm a professor of mathematics at the University of North Carolina Asheville. I've also done a fair amount of consulting work over the years focusing on scientific and data visualization.
I'm happy to be part of the first Observable Ambassador's cohort.
Public
Edited
May 19, 2023
1 fork
4 stars
NC Congressional DistrictsTrivariate choropleth for racial composition in the USRacial distribution in NCWNC Zoom3D Choropleth for NC County PopulationsNC CountiesTriangulated Canadian Provinces (separate)Triangulated NC CountiesAn X3D GlobeCanadian Elections 3DWNC SurroundElectoral Results TilegramThe new Electoral CollegeElectoral MapGPX rides with Leaflet and OSMOld encoded polyline rides with LeafletGPX rides with Maplibre and MaptilerBuncombe county votingThe NC Congressional redistricting battleHexapolis 538Zillow Home PricesSetting up HexapolisCOVID curvesThirty day Map Challenge - Day 1Simple grid cartogramMass shootings in the USHBCUsNC State Legislative Elections 2022Hierarchical Structure of the US RegionsIndigenous territories of the SoutheastD3.force to desired positionPopulation Choropleth for the Contiguous US StatesPlotting a few points on a mapMutliple bubble maps for CSV dataWorld population bubble mapReproductive rights and ... ??Gerrymandering Hexapolis by handVisualizations of gun ownership dataIncome inequality in North Carolina
2020 Census Apportionment Tilegram
function make_tilegram() {
let div = d3
.create('div')
.style("width", `${map_width}px`)
.style("height", `${height}px`)
.style('overflow', 'hidden');
let svg = div
.append('svg')
.style('overflow', 'hidden')
.attr("viewBox", [0, 0, map_width, height]);
let map_obj, hex_data, boundary_data;
if (map_type == 'Together') {
map_obj = tiles;
hex_data = tiles;
boundary_data = tile_boundaries;
} else if (map_type == 'Broken') {
map_obj = broken_tiles;
hex_data = broken_tiles;
boundary_data = broken_tile_boundaries;
}
let proj = d3
.geoIdentity()
.reflectY(true)
.fitSize([map_width, height], map_obj);
let path = d3.geoPath().projection(proj);
let map = svg.append('g');
map
.selectAll("path.tile")
.data(hex_data.features)
.join("path")
.attr('class', 'tile')
.attr('d', path)
// .style('fill', () => d3.interpolateCool(Math.random()))
.style("fill", function(d) {
let fips = d.id;
let info = info_map.get(fips);
let p;
if (shade_by == "Representation") {
p = info.reps / max_reps;
return d3.interpolateBlues(p ** 0.6);
} else if (shade_by == "Representation change") {
p = (info.change + 2) / 4.1;
return d3.interpolateRdYlGn(p);
}
})
.attr('data-state', d => d.id)
.attr("stroke-width", '1px')
.attr("stroke", "white")
.attr("stroke-linejoin", "round");
map
.selectAll("path.boundary")
.data(boundary_data.features)
.join("path")
.attr('class', 'boundary')
.attr('d', path)
.style('fill', 'black')
.style("fill-opacity", 0)
.attr("stroke-width", '2px')
.attr("stroke", "black")
.attr("stroke-linejoin", "round")
.attr('data-state', d => d.id)
.on('mouseenter', function(evt) {
let copy = this.cloneNode(true);
copy.setAttribute('stroke', 'black');
copy.setAttribute('stroke-width', '6px');
copy.setAttribute('class', 'temp');
copy.addEventListener('mouseleave', function() {
map.selectAll('.temp').remove();
});
let fips = d3.select(evt.target).attr('data-state');
let info = info_map.get(fips);
tippy(copy, {
allowHTML: true,
maxWidth: 420,
theme: 'light',
content: `
<table>
<tr><th>State</th><th>Population</th><th>Representation</th><th>Change</th></tr>
<tr>
<td><span class="td">${info.name}</span></td>
<td><span class="td">${info.pop}</span></td>
<td><span class="td">${info.reps}</span></td>
<td><span class="td">${info.change}</span></td>
</tr>
</table>
`
});
map.append(() => copy);
});
return div.node();
}
height = 0.625 * map_width
map_width = width // < 800 ? width : 800
max_reps = d3.max(Array.from(info_map.values()).map(o => o.reps))
info_map = {
let info_map = new Map();
apportionment_data.forEach(function(o) {
let fips = o.fips;
let name = o.state_name;
let abbr = o.abbr;
let pop = parseInt(o.apportionment_population);
let reps = parseInt(o.reps);
let change = parseInt(o.change);
info_map.set(fips, {
name: name,
abbr: abbr,
pop: pop,
reps: reps,
change: change
});
});
return info_map;
}
apportionment_data = FileAttachment("new_apportionment.csv").csv()
apportionment_data.map((o) => ({ name: o.state_name, abbr: o.abbr }))
broken_tile_boundaries = {
let map_file = await FileAttachment(
"new_congress_broken_boundaries_tilegram.topo.json"
).json();
let boundaries = topojson.feature(map_file, map_file.objects.tiles);
return boundaries;
}
broken_tiles = {
let map_file = await FileAttachment(
"new_congress_broken_tilegram.topo.json"
).json();
let states = topojson.feature(map_file, map_file.objects.tiles);
return states;
}
tile_boundaries = {
let map_file = await FileAttachment(
"new_congress_tilegram_boundaries2.topo@1.json"
).json();
let boundaries = topojson.feature(map_file, map_file.objects.tiles);
return boundaries;
}
tiles = {
let map_file = await FileAttachment("new_congress_tilegram2.topo@1.json").json();
let states = topojson.feature(map_file, map_file.objects.tiles);
return states;
}
import { Radio } from "@observablehq/inputs"
tippy = require("tippy.js@6")
topojson = require("topojson-client@3")
d3 = require('d3@6')
style = html`<link rel="stylesheet" href="${await require.resolve(
`tippy.js/themes/light.css`
)}">`
html`<style>
td,th {
text-align: center;
}
.td {
padding: 20px
}
</style>`
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