forked from MapComplete/MapComplete
89 lines
No EOL
2.3 KiB
TypeScript
89 lines
No EOL
2.3 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 = (2 * Math.atan(Math.pow(F * a / rho, 1 / n) * Math.pow((1 + e * Math.sin(newLatitude)) / (1 - e * Math.sin(newLatitude)), e / 2))) - 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(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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main(process.argv.slice(2)) |