The avatar for @emileaben
Internet Data Junkie
Published
Edited
May 19, 2021
1
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md`# minRTT map`
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`first try. reusing some of the code at https://observablehq.com/@mbostock/turf-isolines`
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{
const height = width / 1.6;
const context = DOM.context2d(width, height);
const projection = d3.geoMercator().fitSize([width, height], isolines);
const path = d3.geoPath(projection, context);
context.beginPath(), path(isolines), context.stroke();
return context.canvas;
}
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{
const height = width / 1.6;
const context = DOM.context2d(width, height);
const projection = d3.geoMercator().fitSize([width, height], isolines);
const path = d3.geoPath(projection, context);
for (const isoband of isobands.features) {
context.beginPath();
path(isoband);
context.fillStyle = z(isoband.properties.min_rtt.split("-")[0]);
context.fill();
}
return context.canvas;
}
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z = d3.scaleSequential(d3.interpolateViridis).domain(d3.extent(breaks))
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breaks = [0,10,50,100,150,200]
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isolines = turf.isolines(geoj, breaks, {zProperty: "min_rtt"})
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isobands = turf.isobands(geoj, breaks, {zProperty: "min_rtt"})
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geoj = FileAttachment("1299.geo.json").json()
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turf = require("@turf/turf@5")
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