add files and folders

webgis-spbu/fetch_geojson.js

@@ -0,0 +1,61 @@
+const https = require('https');
+const fs = require('fs');
+
+const kecamatans = [
+  "Kecamatan Pontianak Barat",
+  "Kecamatan Pontianak Kota",
+  "Kecamatan Pontianak Selatan",
+  "Kecamatan Pontianak Tenggara",
+  "Kecamatan Pontianak Timur",
+  "Kecamatan Pontianak Utara"
+];
+
+const featureCollection = {
+  type: "FeatureCollection",
+  features: []
+};
+
+let completed = 0;
+
+function fetchGeojson(name) {
+  const url = `https://nominatim.openstreetmap.org/search.php?q=${encodeURIComponent(name)}&polygon_geojson=1&format=jsonv2`;
+  const options = {
+    headers: { 'User-Agent': 'WebGIS-SPBU-App/1.0' }
+  };
+  
+  https.get(url, options, (res) => {
+    let data = '';
+    res.on('data', chunk => data += chunk);
+    res.on('end', () => {
+      const results = JSON.parse(data);
+      const geomResult = results.find(r => r.geojson && r.category === 'boundary' && r.type === 'administrative');
+      if (geomResult) {
+        featureCollection.features.push({
+          type: "Feature",
+          properties: {
+            Kecamatan: name.replace('Kecamatan ', ''),
+            Name: name
+          },
+          geometry: geomResult.geojson
+        });
+        console.log("Fetched " + name);
+      } else {
+        console.log("Not found for " + name);
+      }
+      completed++;
+      if (completed === kecamatans.length) {
+        fs.writeFileSync('js/pontianak_kecamatan.geojson', JSON.stringify(featureCollection, null, 2));
+        console.log("All done! Saved to js/pontianak_kecamatan.geojson");
+      }
+    });
+  }).on('error', (e) => {
+    console.error(e);
+  });
+}
+
+// Nominatim has a usage policy of 1 request per second. We will stagger the requests.
+kecamatans.forEach((kec, i) => {
+  setTimeout(() => {
+    fetchGeojson(kec);
+  }, i * 1500); // 1.5 seconds apart
+});