MapComplete/scripts/importscripts/zhv.ts

import { readFileSync, writeFileSync } from "fs"
import Script from "../Script"
import { parse } from "papaparse"
import { FeatureCollection, Point } from "geojson"

class ZHVcsv2GeoJson extends Script {
    constructor() {
        super("Converts a CSV file with ZHV data to GeoJSON format. Usage: csv-file output-file")
    }

    async main(args: string[]): Promise<void> {
        const csvFile = args[0]
        const outputFile = args[1]

        if (!csvFile || !outputFile) {
            console.error("Usage: csv-file output-file")
            return
        }

        // Read the CSV file and parse it using PapaParse
        const text = readFileSync(csvFile, "utf-8")
        const parsed = parse(text, {
            header: true,
            dynamicTyping: false,
        })

        console.log(`Parsed ${parsed.data.length} rows from ${csvFile}`)
        console.log(`First row:`, parsed.data[0])

        // Drop all rows that do not have a valid latitude and longitude
        parsed.data = parsed.data.filter((row: any) => {
            return row["Latitude"] && row["Longitude"]
        })

        // Convert the parsed data to GeoJSON format
        const geoJson: FeatureCollection<Point> = {
            type: "FeatureCollection",
            features: parsed.data.map((row: any) => ({
                type: "Feature",
                geometry: {
                    type: "Point",
                    coordinates: [
                        parseFloat(row["Longitude"].replace(",", ".")),
                        parseFloat(row["Latitude"].replace(",", ".")),
                    ],
                },
                properties: row,
            })),
        }

        console.log(`First feature:`, geoJson.features[0])

        // Write the GeoJSON output to the specified file
        writeFileSync(outputFile, JSON.stringify(geoJson), "utf-8")
    }
}

new ZHVcsv2GeoJson().run()