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 dayCharging points for electric vehicles in ParisLet's design a "dot cartogram"Hello geovizWorld Population
Pan and zoom
map1 = {
let svg = viz.create({
projection: d3.geoEqualEarth(),
zoomable: true // 🪄🪄🪄🪄🪄
});
svg.outline();
svg.graticule({ stroke: "white" });
svg.path({ datum: world, fill: "white", fillOpacity: 0.5 });
svg.circle({
data: cities,
r: "population",
k: 10,
fill: "#38896F",
strokeWidth: 0.5,
tip: "$city"
});
svg.header({ text: "A Zoomable Map of World Cities" });
return svg.render();
}
map = {
let svg = viz.create({
projection: d3.geoMercator(),
zoomable: true
});
svg.tile({
zoomDelta: 1,
increasetilesize: 1,
url: "worldStreet"
});
return svg.render();
}
{
let svg = viz.create({
projection: d3.geoEqualEarth(),
zoomable: [0.75, 2] // by using an array, you can specify the zoom scale extent
});
svg.outline();
svg.graticule({ stroke: "white" });
svg.path({ datum: world, fill: "white", fillOpacity: 0.5 });
return svg.render();
}
{
let k = 80;
let scale = d3.scaleSqrt(
[0, d3.max(world.features.map((d) => +d.properties.pop))],
[0, k * 0.8]
);
viz.tool.addfonts([
{
fontFamily: "TiltNeon",
url: await FileAttachment(
"TiltNeon-Regular-VariableFont_XROT,YROT.ttf"
).url()
}
]);
let svg = viz.create({
zoomable: "versor",
//zoomable: true,
margin: 50,
width: 800,
projection: d3.geoOrthographic().rotate([-20, -25]).clipAngle(90)
});
svg.outline({ fill: viz.effect.radialGradient(svg) });
svg.graticule();
svg.path({
datum: world,
id: "test",
fill: "#317370"
});
svg.circle({
id: "bubbles",
data: world,
r: "pop",
fill: "#c95fa9",
tip: "$NAMEen",
k
});
svg.text({
id: "lab",
data: world,
text: "ISO3",
fill: "white",
fontFamily: "TiltNeon",
fontSize: (d) => scale(d.properties.pop)
});
svg.legend.circles_nested({
id: "legend",
pos: [5, 5],
data: world.features.map((d) => d.properties.pop),
title: "Population",
gap: 10,
values_dx: 3,
frame: true,
frame_stroke: "none",
k
});
return svg.render();
}
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