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File size: 3,459 Bytes
57a889c | 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 41 42 43 44 45 46 47 48 49 50 51 52 53 54 55 56 57 58 59 60 61 62 63 64 65 66 67 68 69 70 71 72 73 74 75 76 77 78 79 80 81 82 83 84 85 86 87 88 89 90 91 92 93 94 95 96 97 98 99 100 101 102 103 104 105 106 107 108 109 | #!/usr/bin/env node
// Build server/assets/airports.json from OurAirports (davidmegginson.github.io/ourairports-data).
// License: Public Domain. Keeps large/medium airports with an IATA code; timezone derived from coords via tz-lookup.
import fs from 'node:fs'
import path from 'node:path'
import https from 'node:https'
import { fileURLToPath } from 'node:url'
import tzLookup from 'tz-lookup'
const __dirname = path.dirname(fileURLToPath(import.meta.url))
const OUT = path.join(__dirname, '..', 'assets', 'airports.json')
const SRC = 'https://davidmegginson.github.io/ourairports-data/airports.csv'
function fetchText(url) {
return new Promise((resolve, reject) => {
https.get(url, (res) => {
if (res.statusCode !== 200) return reject(new Error(`HTTP ${res.statusCode}`))
let data = ''
res.setEncoding('utf8')
res.on('data', chunk => { data += chunk })
res.on('end', () => resolve(data))
}).on('error', reject)
})
}
function parseCsv(text) {
const rows = []
let row = []
let cur = ''
let inQuotes = false
for (let i = 0; i < text.length; i++) {
const ch = text[i]
if (inQuotes) {
if (ch === '"') {
if (text[i + 1] === '"') { cur += '"'; i++ } else { inQuotes = false }
} else {
cur += ch
}
} else {
if (ch === '"') inQuotes = true
else if (ch === ',') { row.push(cur); cur = '' }
else if (ch === '\n') { row.push(cur); rows.push(row); row = []; cur = '' }
else if (ch === '\r') { /* skip */ }
else cur += ch
}
}
if (cur.length > 0 || row.length > 0) { row.push(cur); rows.push(row) }
return rows
}
const raw = await fetchText(SRC)
const rows = parseCsv(raw)
const header = rows[0]
const idx = (name) => header.indexOf(name)
const TYPE = idx('type')
const NAME = idx('name')
const LAT = idx('latitude_deg')
const LNG = idx('longitude_deg')
const COUNTRY = idx('iso_country')
const MUNICIPALITY = idx('municipality')
const SERVICE = idx('scheduled_service')
const ICAO = idx('icao_code')
const IATA = idx('iata_code')
const KEEP = new Set(['large_airport', 'medium_airport'])
const airports = []
let skippedNoTz = 0
for (let i = 1; i < rows.length; i++) {
const r = rows[i]
if (!r || r.length < header.length) continue
if (!KEEP.has(r[TYPE])) continue
const iata = r[IATA]?.trim().toUpperCase()
if (!iata || iata.length !== 3) continue
if (r[SERVICE] !== 'yes') continue
const lat = Number(r[LAT])
const lng = Number(r[LNG])
if (!Number.isFinite(lat) || !Number.isFinite(lng)) continue
let tz = null
try { tz = tzLookup(lat, lng) } catch { skippedNoTz++; continue }
if (!tz) { skippedNoTz++; continue }
airports.push({
iata,
icao: r[ICAO]?.trim().toUpperCase() || null,
name: r[NAME],
city: r[MUNICIPALITY] || '',
country: r[COUNTRY] || '',
lat: Math.round(lat * 1e6) / 1e6,
lng: Math.round(lng * 1e6) / 1e6,
tz,
})
}
const seen = new Map()
for (const a of airports) {
const existing = seen.get(a.iata)
if (!existing) { seen.set(a.iata, a); continue }
if (existing.icao && !a.icao) continue
if (!existing.icao && a.icao) seen.set(a.iata, a)
}
const unique = Array.from(seen.values()).sort((a, b) => a.iata.localeCompare(b.iata))
fs.writeFileSync(OUT, JSON.stringify(unique))
const size = fs.statSync(OUT).size
console.log(`Wrote ${unique.length} airports to ${OUT} (${(size / 1024).toFixed(1)} KB); skipped ${skippedNoTz} without timezone`)
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