Hi. I'm Nicolas Lambert, research engineer in geographic information science at CNRS (France). My job is to draw maps and teach cartography at the university. I am a geographer 🌎, and not really a developer 🖥️
Map projectionsh3-jsSymbolsThe draw() functionsquareProportional symbolsSpike markTypologyChoroplethLayout marksHandle geometriesSVG filters and clipTile markContainersinsetsPath markText markInteractivityTooltipsLegendsCircle markRidgelines mapWhy it's better not to add scalebars to world mapsNight and dayPan and zoomCharging points for electric vehicles in ParisLet's design a "dot cartogram"World Population
Hello geoviz
viz.circle({ data: world, fill: "#38896F" })
{
let svg = viz.create({
projection: d3.geoNaturalEarth1()
});
svg.plot({ type: "graticule", stroke: "#38896F" }); // 1st way to write
svg.plot({ type: "path", data: world, fill: "#38896F", tip: true }); // 2nd way to write
return svg.render();
}
{
let svg = viz.create({ domain: world, projection: d3.geoNaturalEarth1() });
svg.plot({ type: "path", data: world, fill: "#38896F", tip: true });
svg
.append("text")
.attr("x", 330)
.attr("y", 170)
.attr("fill", "#38896F")
.text("Text with d3js");
return svg.render();
}
{
let svg = viz.create({
zoomable: true,
projection: d3.geoNaturalEarth1(),
background: "#bddbf0",
width: 600,
margin: 20
});
svg.path({ datum: world, fill: "#38896F" });
return svg.render();
}
{
let svg = viz.create({
zoomable: true,
projection: d3.geoNaturalEarth1()
});
svg.plot({ type: "outline" });
svg.plot({ type: "graticule", stroke: "white" });
svg.plot({ type: "path", datum: world, fill: "white", fillOpacity: 0.4 });
svg.plot({ type: "header", text: "Hello Geoviz" });
return svg.render();
}
{
let svg = viz.container.create({
zoomable: true,
projection: d3.geoEqualEarth()
});
svg.outline();
svg.path({
datum: world,
fill: "white",
fillOpacity: 0.4
});
svg.circle({
data: world,
r: "pop",
fill: "#38896F",
k,
tip: `$name
$pop inh.`
});
svg.legend.circles_nested({
pos: [20, 220],
title: "Population in the country",
subtitle: "(inhabitants)",
data: world.features.map((d) => d.properties.pop),
values_round: 0,
k
});
return svg.render();
}
choro = viz.tool.choro(world.features.map((d) => d.properties.gdppc))
{
let svg = viz.container.create({
zoomable: true,
projection: await require("d3-geo-projection").then((d) => d.geoHill())
});
svg.outline();
svg.path({
data: world,
fill: (d) => choro.colorize(d.properties.gdppc),
strokeWidth: 0.3,
tip: `$name
Wealth: $gdppc$ per inh.`
});
svg.legend.choro_horizontal({
pos: [380, 452],
title: "GDP per capita",
subtitle: "($ per inh.)",
note: "Source: worldbank, 2020",
values_round: 0,
breaks: choro.breaks,
colors: choro.colors
});
return svg.render();
}
typo = viz.tool.typo(world.features.map((d) => d.properties.region))
{
let svg = viz.create({
width: 700,
margin: [20, 0, 0, 0],
zoomable: true,
projection: d3.geoAzimuthalEqualArea()
});
svg.outline();
svg.path({
data: world,
fill: (d) => typo.colorize(d.properties.region),
tip: (d) => `${d.properties.name} (${d.properties.region})`
});
svg.legend.typo_vertical({
pos: [280, 400],
title: null,
alphabetical: true,
values_fill: "black",
colors: typo.colors,
types: typo.types,
missing: false
});
return svg.render();
}
{
// Data
let africa = viz.tool.featurecollection(
world.features.filter((d) => d.properties.region == "Africa")
);
// Font
viz.tool.addfonts([
{
fontFamily: "Pacifico",
url: await FileAttachment("Pacifico-Regular.ttf").url()
}
]);
// main map
let svg = viz.create({
domain: africa,
width: 800,
margin: [20, 20, 20, 20],
background: "#C9EAFE",
fontFamily: "Pacifico"
});
svg.path({
datum: world,
fill: "grey",
fillOpacity: 0.1
});
svg.path({
datum: africa,
fill: "black",
transform: "translate(4,7)",
fillOpacity: 0.2
});
svg.path({
datum: africa,
fill: "#F7E3A1",
stroke: "white"
});
svg.header({
text: "The African continent",
fill: "#6b6969",
background_fill: "#F7E3A1",
fontSize: 60
});
let k = 50;
let scale = d3.scaleSqrt(
[0, d3.max(africa.features.map((d) => +d.properties.pop))],
[0, k * 0.6]
);
svg.text({
data: africa,
text: "NAMEen",
fill: "#6b6969",
strokeWidth: 5,
stroke: "white",
strokeOpacity: 0.7,
fontSize: (d) => scale(d.properties.pop)
});
// inset
let inset = viz.container.create({
parent: svg,
pos: [15, 510],
width: 340,
projection: await require("d3-geo-polygon").then((d) => d.geoAirocean())
});
inset.outline({
fill: "white",
strokeWidth: 1,
stroke: "#7499d6"
});
inset.graticule({
step: 30,
strokeDasharray: "none",
strokeOpacity: 0.5,
stroke: "#7499d6"
});
inset.path({
datum: world,
fill: "#a1acc2",
stroke: "none"
});
inset.path({
datum: africa,
fill: "#7499d6",
stroke: "#7499d6"
});
return svg.render();
}
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