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.
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 OSMGPX rides with Maplibre and MaptilerBuncombe county votingThe NC Congressional redistricting battleHexapolis 538Zillow Home PricesSetting up HexapolisCOVID curvesThirty day Map Challenge - Day 1Simple grid cartogram2020 Census Apportionment TilegramMass 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
Old encoded polyline rides with Leaflet
ride_info = {
if (ride_selector != 'overview') {
let ride_info = old_bike_rides.filter(o => o.name == ride_selector)[0];
let trkpts = decodeLine(ride_info.polyline);
return {
trkpts: trkpts,
elevation_chart: ride_info.elevation_chart,
title: ride_info.title,
comment: ride_info.comment
};
}
}
function create_gpx_path(trkpts) {
let polyline = L.polyline(trkpts, { color: 'blue' });
let start_marker = L.marker(trkpts[0], {
icon: L.divIcon({ className: 'markerIconShape startIconColor' })
});
let end_marker = L.marker(trkpts.slice(-1)[0], {
icon: L.divIcon({ className: 'markerIconShape endIconColor' })
});
let gpx_path = L.layerGroup([
polyline,
start_marker,
end_marker
]);
return gpx_path;
}
function decodeLine(encoded) {
var len = encoded.length;
var index = 0;
var array = [];
var lat = 0;
var lng = 0;
while (index < len) {
var b;
var shift = 0;
var result = 0;
do {
b = encoded.charCodeAt(index++) - 63;
result |= (b & 0x1f) << shift;
shift += 5;
} while (b >= 0x20);
var dlat = result & 1 ? ~(result >> 1) : result >> 1;
lat += dlat;
shift = 0;
result = 0;
do {
b = encoded.charCodeAt(index++) - 63;
result |= (b & 0x1f) << shift;
shift += 5;
} while (b >= 0x20);
var dlng = result & 1 ? ~(result >> 1) : result >> 1;
lng += dlng;
array.push([lat * 1e-5, lng * 1e-5]);
}
return array;
}
markerR = L.icon({
iconUrl: await FileAttachment("markerR.png").url(),
iconSize: [20, 34],
iconAnchor: [20, 34],
})
markerM = L.icon({
iconUrl: await FileAttachment("markerM.png").url(),
iconSize: [20, 34],
iconAnchor: [20, 34]
})
old_bike_rides = FileAttachment("old_polylines@3.json").json()
style = html`
<style>
.markerIconShape {
border: 1px solid black;
height: 22px;
width: 22px;
border-radius:50%;
-moz-border-radius:50%;
-webkit-border-radius:50%;
}
.startIconColor {
background-color:#0f0;
}
.wptIconColor {
background-color:#ff0;
}
.endIconColor {
background-color:#f00;
}
.link {
color: blue;
cursor: pointer;
}
.link:hover {
text-decoration: underline;
}
</style>
`
import { mb_token } from "@mcmcclur/mapbox-token"
L = {
const L = await require("leaflet@1/dist/leaflet.js");
if (!L._style) {
const href = await require.resolve("leaflet@1/dist/leaflet.css");
document.head.appendChild(
(L._style = html`<link href=${href} rel=stylesheet>`)
);
}
return L;
}
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