The avatar for @neocartocnrs
Nicolas Lambert
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 🖥️
Public
Observable pour les geographes
Edited
Oct 3, 2024
2 stars
1
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world = FileAttachment("world.json").json()
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geo = require("geotoolbox@2")
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geo
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world_light = geo.simplify(world, { k })
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union = geo.union(world)
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union2 = geo.union(world, { id: "region" })
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union2
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africa = geo.filter(world, (d) => d.region == "Africa")
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buff = geo.buffer(africa, { dist: dist, merge: merge })
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viewof dist = Inputs.range([1, 4000], { label: "Distance", step: 100 })
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clipworld = geo.clip(world, { clip: buff })
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bertin.draw({
params: { projection: "user", width: 800 },
layers: [
{
geojson: clipworld,
fill: "#a63878",
stroke: "white"
},
{
geojson: world,
fill: "#CCC",
stroke: "none"
}
]
})
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turf = require("@turf/turf@6")
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turfbuff = turf.buffer(africa, dist2, {
units: "kilometers",
endCapStyle: "round"
})
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viewof dist2 = Inputs.range([1, 4000], { label: "Distance", step: 100 })
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Paris = turf.point([2.335042434318193, 48.85859730057634])
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Shangai = turf.point([121.5685920321606, 31.557068992422167])
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distance = Math.round(turf.distance(Paris, Shangai, { units: "kilometers" })) +
" km"
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greatCircle = turf.greatCircle(Paris, Shangai, {
properties: { name: "Paris to Shangai" }
})
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jsts = require("https://unpkg.com/jsts@2.10.0/dist/jsts.min.js")
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usa = ({
type: "FeatureCollection",
features: world.features.filter((d) => d.properties.ISO3 == "USA")
})
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reader = new jsts.io.GeoJSONReader()
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writer = new jsts.io.GeoJSONWriter()
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usajsts = reader.read(usa)
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a = usajsts.features[0].geometry
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abuff = a.buffer(dist3)
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buffer = writer.write(abuff)
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viewof dist3 = Inputs.range([-5, 8], {
label: "Distance (unités de la couche)"
})
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bertin.draw({
params: { margin: 100 },
layers: [
{
geojson: buffer,
stroke: "#a63878",
strokeWidth: 2,
strokeDasharray: 5,
fill: "none"
},
{ geojson: usa, stroke: "none", fill: "#CCC" }
]
})
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bertin = require("bertin")
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import {thumbs} from "@neocartocnrs/hello-geotoolbox"
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