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const fs = require('fs');
const path = require('path');
// Base URL for the WFS service
const baseUrl = 'https://kartta.hel.fi/ws/geoserver/avoindata/wfs';
// List of layers to download (extendable by adding more items to this array)
const layers = [
'Aluesarjat_avainluvut_2024',
'Seutukartta_liikenne_paatiet',
'Seutukartta_liikenne_metroasemat',
'Seutukartta_liikenne_metro_rata',
'Seutukartta_liikenne_juna_rata',
'Seutukartta_liikenne_juna_asema',
'Seutukartta_aluejako_pienalue',
'Seutukartta_aluejako_kuntarajat',
'Seutukartta_maankaytto_jarvet',
'Seutukartta_maankaytto_joet',
'Seutukartta_meren_rantaviiva',
'Toimipisterekisteri_palvelut'
];
// Output directory
const outputDir = path.join(__dirname, 'app', 'data');
// Create output directory if it doesn't exist
if (!fs.existsSync(outputDir)) {
fs.mkdirSync(outputDir, { recursive: true });
}
// Function to download and save layer data
async function downloadLayer(layer) {
const url = `${baseUrl}?service=WFS&version=2.0.0&request=GetFeature&typeName=avoindata:${layer}&outputFormat=application/json&srsname=EPSG:4326`;
try {
const response = await fetch(url);
if (!response.ok) {
throw new Error(`Failed to fetch ${layer}: ${response.statusText}`);
}
const data = await response.json();
const filePath = path.join(outputDir, `${layer}.json`);
fs.writeFileSync(filePath, JSON.stringify(data, null, '\t'));
console.log(`Downloaded and saved: ${layer}.json`);
} catch (error) {
console.error(`Error downloading ${layer}: ${error.message}`);
}
}
// Download all layers sequentially
async function main() {
for (const layer of layers) {
await downloadLayer(layer);
}
}
main();
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