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Lat/lon histogram
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.block
license: mit
height: 720
border: no
Raw
README.md

Lat/lon histogram

Made with blockup.

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boundary.topojson
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dist.css
.buttons{margin:0 auto;text-align:center}.map svg{display:block;margin:0 auto}.map svg circle{fill:#8f092a;fill-opacity:.25;stroke:#8f092a}
Raw
dist.js
var margin={top:10,right:10,bottom:10,left:10};d3.json("./boundary.topojson",function(t){var n=topojson.feature(t,t.objects.boundary),e=(d3.geoBounds(n),d3.geoCentroid(n),d3.geoAlbers()),r=d3.geoPath().projection(e),o=r.bounds(n),a=(o[1][0]-o[0][0])/(o[1][1]-o[0][1]),i=460,u=i*a,c=u-margin.left-margin.right,f=i-margin.top-margin.bottom,l=d3.select(".map svg").attrs({width:u,height:i}).append("g").attr("transform","translate("+margin.left+", "+margin.top+")");e.fitSize([c,f],n);var d=_(n.features).map("geometry").flatten().map("coordinates").flatten().sortBy("length").map(function(t){return turf.lineString(t)}).value(),s=_(d).map(function(t){return turf.lineDistance(t)}).sum(),m=1e3,g=m,p=_(d).map(function(t){var n=turf.lineDistance(t),e=Math.ceil(n*m/s),r=Math.min(g,e);g-=r;var o=n/r,a=d3.range(r).map(function(n){return turf.along(t,n*o)});return a}).flatten().map(function(t){return e(t.geometry.coordinates)}).map(function(t,n){return{index:n,x2:t[0],y2:t[1]}}).value(),y=5,x=_(p).groupBy(function(t){return Math.round(t.y2/y)*y}).map(function(t,n){return _(t).sortBy("x2").map(function(e,r){return{index:e.index,x1:c/2+4*r-4*t.length/2,y1:+n,x2:e.x2,y2:e.y2}}).value()}).flatten().value(),v=function(){var t=l.selectAll("circle").data(x,function(t){return t.index});t.enter().append("circle").attrs({cx:function(t){return t.x1},cy:function(t){return t.y1},r:1}).merge(t).transition("enter").duration(1e3).delay(function(t,n){return 10*n}).attrs({cx:function(t){return t.x2},cy:function(t){return t.y2},r:1})},h=function(){var t=l.selectAll("circle").data(x,function(t){return t.index});t.transition("exit").duration(250).delay(function(t,n){return 2*n}).attrs({cx:function(t){return t.x1},cy:function(t){return t.y1},r:1})};v(),document.querySelector("button.enter").addEventListener("click",v),document.querySelector("button.exit").addEventListener("click",h)});
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b[0][0]) / (b[1][1] - b[0][1])\n\n\tconst outerHeight = 460\n\tconst outerWidth = outerHeight * aspect\n\n\tconst width = outerWidth - margin.left - margin.right\n\tconst height = outerHeight - margin.top - margin.bottom\n\n\t// Prepare svg.\n\tconst g = d3.select('.map svg')\n\t\t\t.attrs({ width: outerWidth, height: outerHeight })\n\t\t.append('g')\n\t\t\t.attr('transform', `translate(${margin.left}, ${margin.top})`)\n\n\t// Fit the feature to the container's width.\n\tprojection.fitSize([width, height], feature)\n\n\t// Get the individual line strings.\n\tconst lineStrings = _(feature.features)\n\t\t.map('geometry')\n\t\t.flatten()\n\t\t.map('coordinates')\n\t\t.flatten()\n\t\t.sortBy('length')\n\t\t.map(d => turf.lineString(d))\n\t\t.value()\n\n\t// Calculate the overall line string length.\n\tconst totalLength = _(lineStrings)\n\t\t.map(d => turf.lineDistance(d))\n\t\t.sum()\n\n\t// Desired number of total points.\n\tconst pointsCount = 1000\n\tlet pointsRemaining = pointsCount\n\n\tconst points = _(lineStrings)\n\t\t.map(line => {\n\n\t\t\t// How many points will this line get?\n\n\t\t\t// First, calculate this line's length.\n\t\t\tconst lineLength = turf.lineDistance(line)\n\n\t\t\t// Next, get this line's points proportion, rounded up.\n\t\t\tconst upperCount = Math.ceil(lineLength * pointsCount / totalLength)\n\n\t\t\t// Don't get more points that are available.\n\t\t\tconst linePointsCount = Math.min(pointsRemaining, upperCount)\n\n\t\t\t// Make sure to update points remaining.\n\t\t\tpointsRemaining -= linePointsCount\n\n\t\t\t// Now that we know how many points this line will get,\n\t\t\t// calculate the distance between points - the step:\n\t\t\tconst step = lineLength / linePointsCount\n\n\t\t\tconst linePoints = d3.range(linePointsCount)\n\t\t\t\t.map(d => turf.along(line, d * step))\n\n\t\t\treturn linePoints\n\n\t\t})\n\t\t.flatten()\n\t\t.map(d => projection(d.geometry.coordinates))\n\t\t.map((d, index) => ({\n\t\t\tindex,\n\t\t\tx2: d[0],\n\t\t\ty2: d[1],\n\t\t}))\n\t\t.value()\n\n\tconst yStep = 5\n\n\tconst histogram = _(points)\n\t\t.groupBy(d => Math.round(d.y2 / yStep) * yStep)\n\t\t.map((value, key) =>\n\t\t\t_(value)\n\t\t\t\t.sortBy('x2')\n\t\t\t\t.map((d, i) => ({\n\t\t\t\t\tindex: d.index,\n\t\t\t\t\tx1: ((width / 2) + (i * 4)) - (value.length * 4)/2,\n\t\t\t\t\ty1: +key,\n\t\t\t\t\tx2: d.x2,\n\t\t\t\t\ty2: d.y2,\n\t\t\t\t}))\n\t\t\t\t.value())\n\t\t.flatten()\n\t\t.value()\n\n\t// This function adds the circles.\n\tconst enter = () => {\n\n\t\t// JOIN new data with old elements.\n\t\tconst circles = g.selectAll('circle')\n\t\t\t.data(histogram, d => d.index)\n\n\t\t// ENTER new elements present in new data.\n\t\tcircles.enter().append('circle')\n\t\t\t\t.attrs({\n\t\t\t\t\tcx: d => d.x1,\n\t\t\t\t\tcy: d => d.y1,\n\t\t\t\t\tr: 1,\n\t\t\t\t})\n\t\t\t.merge(circles)\n\t\t\t.transition('enter')\n\t\t\t\t.duration(1000)\n\t\t\t\t.delay((d, i) => i * 10)\n\t\t\t\t.attrs({\n\t\t\t\t\tcx: d => d.x2,\n\t\t\t\t\tcy: d => d.y2,\n\t\t\t\t\tr: 1,\n\t\t\t\t})\n\n\t}\n\n\t// This function removes the circles.\n\tconst exit = () => {\n\n\t\t// JOIN new data with old elements.\n\t\tconst circles = g.selectAll('circle')\n\t\t\t\t.data(histogram, d => d.index)\n\n\t\t// UPDATE old elements present in new data.\n\t\tcircles\n\t\t\t.transition('exit')\n\t\t\t\t.duration(250)\n\t\t\t\t.delay((d, i) => i * 2)\n\t\t\t\t.attrs({\n\t\t\t\t\tcx: d => d.x1,\n\t\t\t\t\tcy: d => d.y1,\n\t\t\t\t\tr: 1,\n\t\t\t\t})\n\n\t}\n\n\t// Fire the enter function on page load.\n\tenter()\n\n\t// Listen to button clicks.\n\tdocument.querySelector('button.enter').addEventListener('click', enter)\n\tdocument.querySelector('button.exit').addEventListener('click', exit)\n\n})\n"]}
Raw
index.html
<!DOCTYPE html>
<title>Lat/lon histogram</title>
<link href='dist.css' rel='stylesheet' />
<body>
<div class='map'>
<svg></svg>
</div>
<div class='buttons'>
<button class='enter'>Enter</button>
<button class='exit'>Exit</button>
</div>
<script src='https://d3js.org/d3.v4.min.js'></script>
<script src='https://d3js.org/d3-selection-multi.v1.min.js'></script>
<script src='https://d3js.org/topojson.v2.min.js'></script>
<script src='https://npmcdn.com/@turf/turf@3.10.2/turf.min.js'></script>
<script src='https://cdn.jsdelivr.net/lodash/4.17.4/lodash.min.js'></script>
<script src='dist.js'></script>
</body>
Raw
Makefile
all:
rm boundary.topojson;
mapshaper -i ~/Downloads/cb_2015_us_nation_5m/cb_2015_us_nation_5m.shp name=boundary -clip bbox=-126,23,-65,50 -filter-slivers min-area=700000000 -lines -simplify dp 5% -o format=topojson boundary.topojson;
Raw
script.js
// Setup chart dimensions.
const margin = { top: 10, right: 10, bottom: 10, left: 10 }
// Get GeoJSON.
d3.json('./boundary.topojson', json => {
const feature = topojson.feature(json, json.objects.boundary)
// Get feature's bounds, centroid, and projection.
const bounds = d3.geoBounds(feature)
const centroid = d3.geoCentroid(feature)
const projection = d3.geoAlbers()
// Get the path.
const path = d3.geoPath().projection(projection)
// Get the path's bounds (i.e., in pixels).
const b = path.bounds(feature)
// Get aspect ratio.
const aspect = (b[1][0] - b[0][0]) / (b[1][1] - b[0][1])
const outerHeight = 460
const outerWidth = outerHeight * aspect
const width = outerWidth - margin.left - margin.right
const height = outerHeight - margin.top - margin.bottom
// Prepare svg.
const g = d3.select('.map svg')
.attrs({ width: outerWidth, height: outerHeight })
.append('g')
.attr('transform', `translate(${margin.left}, ${margin.top})`)
// Fit the feature to the container's width.
projection.fitSize([width, height], feature)
// Get the individual line strings.
const lineStrings = _(feature.features)
.map('geometry')
.flatten()
.map('coordinates')
.flatten()
.sortBy('length')
.map(d => turf.lineString(d))
.value()
// Calculate the overall line string length.
const totalLength = _(lineStrings)
.map(d => turf.lineDistance(d))
.sum()
// Desired number of total points.
const pointsCount = 1000
let pointsRemaining = pointsCount
const points = _(lineStrings)
.map(line => {
// How many points will this line get?
// First, calculate this line's length.
const lineLength = turf.lineDistance(line)
// Next, get this line's points proportion, rounded up.
const upperCount = Math.ceil(lineLength * pointsCount / totalLength)
// Don't get more points that are available.
const linePointsCount = Math.min(pointsRemaining, upperCount)
// Make sure to update points remaining.
pointsRemaining -= linePointsCount
// Now that we know how many points this line will get,
// calculate the distance between points - the step:
const step = lineLength / linePointsCount
const linePoints = d3.range(linePointsCount)
.map(d => turf.along(line, d * step))
return linePoints
})
.flatten()
.map(d => projection(d.geometry.coordinates))
.map((d, index) => ({
index,
x2: d[0],
y2: d[1],
}))
.value()
const yStep = 5
const histogram = _(points)
.groupBy(d => Math.round(d.y2 / yStep) * yStep)
.map((value, key) =>
_(value)
.sortBy('x2')
.map((d, i) => ({
index: d.index,
x1: ((width / 2) + (i * 4)) - (value.length * 4)/2,
y1: +key,
x2: d.x2,
y2: d.y2,
}))
.value())
.flatten()
.value()
// This function adds the circles.
const enter = () => {
// JOIN new data with old elements.
const circles = g.selectAll('circle')
.data(histogram, d => d.index)
// ENTER new elements present in new data.
circles.enter().append('circle')
.attrs({
cx: d => d.x1,
cy: d => d.y1,
r: 1,
})
.merge(circles)
.transition('enter')
.duration(1000)
.delay((d, i) => i * 10)
.attrs({
cx: d => d.x2,
cy: d => d.y2,
r: 1,
})
}
// This function removes the circles.
const exit = () => {
// JOIN new data with old elements.
const circles = g.selectAll('circle')
.data(histogram, d => d.index)
// UPDATE old elements present in new data.
circles
.transition('exit')
.duration(250)
.delay((d, i) => i * 2)
.attrs({
cx: d => d.x1,
cy: d => d.y1,
r: 1,
})
}
// Fire the enter function on page load.
enter()
// Listen to button clicks.
document.querySelector('button.enter').addEventListener('click', enter)
document.querySelector('button.exit').addEventListener('click', exit)
})
Raw
style.styl
$red = #8f092a
.buttons
margin 0 auto
text-align center
.map
svg
display block
margin 0 auto
circle
fill $red
fill-opacity 0.25
stroke $red
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