up

csv_to_geojson.ts

@@ -0,0 +1,67 @@
+import fs from 'fs';
+import path from 'path';
+import csvParser from 'csv-parser';
+import minimist from 'minimist';
+import { Feature, FeatureCollection, Point } from 'geojson';
+
+interface Options {
+  dir: string;
+  file: string;
+  latColumn: string;
+  lonColumn: string;
+  hasHeaders: boolean;
+}
+
+/**
+* @name csvToGeoJSON
+* @description conversion de csv vers geojson
+*
+* Utilisation: 
+* node csv_to_geojson.ts -d ./etalab_data/panneaux -f mon_fichier.csv -lat GPSLatitude -lon GPSLongitude -h
+* 
+**/
+function csvToGeoJSON(options: Options): FeatureCollection<Point> {
+  const { dir, file, latColumn, lonColumn, hasHeaders } = options;
+  const filePath = path.join(dir, file);
+  const features: Feature<Point>[] = [];
+
+  fs.createReadStream(filePath)
+    .pipe(csvParser({ headers: hasHeaders }))
+    .on('data', (row) => {
+      const lat = parseFloat(row[latColumn]);
+      const lon = parseFloat(row[lonColumn]);
+      features.push({
+        type: 'Feature',
+        geometry: {
+          type: 'Point',
+          coordinates: [lon, lat],
+        },
+        properties: row,
+      });
+    })
+    .on('end', () => {
+      const geoJSON: FeatureCollection<Point> = {
+        type: 'FeatureCollection',
+        features,
+      };
+      fs.writeFileSync(`${file}.geojson`, JSON.stringify(geoJSON, null, 2));
+      console.log(`GeoJSON créé avec succès : ${file}.geojson`);
+    });
+
+  return features;
+}
+
+const args = minimist<Options>(process.argv.slice(2), {
+  alias: {
+    dir: 'd',
+    file: 'f',
+    latColumn: 'lat',
+    lonColumn: 'lon',
+    hasHeaders: 'h',
+  },
+  default: {
+    hasHeaders: true,
+  },
+});
+
+csvToGeoJSON(args);