91 lines
2.5 KiB
TypeScript
91 lines
2.5 KiB
TypeScript
import { parse } from "csv-parse/sync"
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import { readFileSync } from "fs"
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var lambert72toWGS84 = function (x, y) {
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var newLongitude, newLatitude
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var n = 0.77164219,
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F = 1.81329763,
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thetaFudge = 0.00014204,
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e = 0.08199189,
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a = 6378388,
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xDiff = 149910,
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yDiff = 5400150,
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theta0 = 0.07604294
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var xReal = xDiff - x,
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yReal = yDiff - y
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var rho = Math.sqrt(xReal * xReal + yReal * yReal),
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theta = Math.atan(xReal / -yReal)
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newLongitude = ((theta0 + (theta + thetaFudge) / n) * 180) / Math.PI
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newLatitude = 0
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for (var i = 0; i < 5; ++i) {
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newLatitude =
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2 *
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Math.atan(
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Math.pow((F * a) / rho, 1 / n) *
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Math.pow(
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(1 + e * Math.sin(newLatitude)) / (1 - e * Math.sin(newLatitude)),
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e / 2
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)
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) -
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Math.PI / 2
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}
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newLatitude *= 180 / Math.PI
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return [newLongitude, newLatitude]
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}
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function main(args: string[]): void {
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if (args.length == 0) {
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/* args = ["/home/pietervdvn/Downloads/Scholen/aantallen.csv",
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"/home/pietervdvn/Downloads/Scholen/perschool.csv",
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"/home/pietervdvn/Downloads/Scholen/Vestigingsplaatsen-van-scholen-gewoon-secundair-onderwijs-cleaned.csv"]
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*/
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console.log("Usage: csvToGeojson input.csv name-of-lat-field name-of-lon-field")
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return
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}
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let file = args[0]
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if (file.startsWith("file://")) {
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file = file.substr("file://".length)
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}
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const latField = args[1]
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const lonField = args[2]
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const csvOptions = {
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columns: true,
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skip_empty_lines: true,
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trim: true,
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}
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const csv: Record<any, string>[] = parse(readFileSync(file), csvOptions)
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const features = csv.map((csvElement, i) => {
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const lat = Number(csvElement[latField])
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const lon = Number(csvElement[lonField])
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if (isNaN(lat) || isNaN(lon)) {
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throw `Not a valid lat or lon for entry ${i}: ${JSON.stringify(csvElement)}`
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}
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return {
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type: "Feature",
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properties: csvElement,
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geometry: {
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type: "Point",
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coordinates: lambert72toWGS84(lon, lat),
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},
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}
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})
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console.log(
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JSON.stringify({
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type: "FeatureCollection",
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features,
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})
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)
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}
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main(process.argv.slice(2))
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