data.mjs

import mapshaper from 'mapshaper';
import fetch from 'node-fetch';
import { writeFileSync } from 'fs';

try {
  const files = ['progression.shp', 'progression.prj', 'progression.dbf'];

  const BASE_URL = 'https://cwfis.cfs.nrcan.gc.ca/downloads/hotspots/';

  const data = await Promise.all(
    files.map(file => fetch(`${BASE_URL}${file}`).then(res => res.buffer()))
  );

  const input = files.reduce((obj, filename, i) => {
    obj[filename] = data[i];
    return obj;
  }, {});

  const cmd = `-i progression.shp -proj wgs84 -clean -each 'd = DATE + ""; this.properties = { date: [d.slice(0,4), d.slice(4,6), d.slice(6,8)].join("-"), area: AREA }' -o out.json format=topojson`;

  const { 'out.json': output } = await mapshaper.applyCommands(cmd, input);

  writeFileSync('src/data/perimeters.json', output);
} catch (err) {
  console.log(err);
}

try {
  const ACTIVE_URL =
    'https://cwfis.cfs.nrcan.gc.ca/geoserver/public/wfs?SERVICE=WFS&REQUEST=GetFeature&outputFormat=application%2Fjson&TYPENAME=public%3Aactivefires_current&cql_filter=hectares > 200';

  const res = await fetch(ACTIVE_URL);

  const { features } = await res.json();

  const active = features
    .filter(d => !['nrcc', 'nwcc', 'ak'].includes(d.properties.agency))
    .sort((a, b) => b.properties.hectares - a.properties.hectares)
    .map(d => ({
      coordinates: [d.properties.lon, d.properties.lat],
      name: d.properties.firename,
      startDate: d.properties.startdate
    }));

  writeFileSync('src/data/active.json', JSON.stringify(active));
} catch (err) {
  console.log(err);
}