Published
Edited
Sep 3, 2020
3 stars
vl.data(outside)
.project(vl.projection('orthographic').rotate(-center.Lon, -center.Lat).scale(50e3))
.view({ fill: '#f3f3f3' })
.layer(
geoLandArea,
geoCountyBoundaries,
geoRoads,
pm25Circles
)
.width(width)
.height(Math.max(Math.floor(width * .75), 480))
.autosize({ type: 'fit-x', contains: 'padding' })
.render()
pm25Circles = vl.markCircle({ size: 20, stroke: 'black', strokeWidth: .5, strokeOpacity: .2 })
.encode(
vl.latitude().fieldQ('Lat'),
vl.longitude().fieldQ('Lon'),
vl.color().fieldQ('PM2_5Value')
.scale({
type: 'threshold',
domain: [6, 12, 35, 55],
scheme: 'redyellowgreen',
reverse: true
})
.legend({ title: 'PM2.5 (μg/m³)', orient: 'bottom' }),
vl.opacity().fieldQ('AGE')
.scale({ domain: [0, 60], range: [1, 0] })
.legend(false),
vl.tooltip(['Label', 'PM2_5Value'])
)
geoRoads = vl.markGeoshape({
stroke: 'lightgray',
strokeWidth: .5,
color: ''
})
.data([ roads ])
geoCountyBoundaries = vl.markGeoshape({
stroke: 'gray',
strokeDash: [6, 2, 2, 2],
color: ''
})
.data([ countyBoundaries ])
geoLandArea = vl.markGeoshape({
stroke: 'lightgray',
strokeWidth: .5,
color: 'white'
})
.data([ landArea ])
json = {
const key = 'pm25-sf'
const json = await (await fetch('https://www.purpleair.com/json')).json()
if (json.code === 429 && localStorage.getItem(key))
return JSON.parse(localStorage.getItem(key))
// localStorage.setItem(key, JSON.stringify(json))
return json
}
outside = {
const key = 'pm25-sf'
const outside = json.results ? json.results.filter(d => d.DEVICE_LOCATIONTYPE === 'outside' && !d.Flag) : []
if (outside.length === 0 && localStorage.getItem(key))
return JSON.parse(localStorage.getItem(key))
localStorage.setItem(key, JSON.stringify(outside))
return outside
}
center = outside.find(d => d.Label.includes('Dogpatch')) || ({ Lat: 37.7749, Lon: -122.4194 })
import { landArea, countyBoundaries, roads } from '@clhenrick/sf-bay-area-basemap'
import { vl } from '@vega/vega-lite-api'
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