Method mergeCustomGeoJSON

modules/core/LocationSystem.js:252–276

* mergeCustomGeoJSON * Accepts a FeatureCollection-like object containing custom locations * Each feature must have a filename-like `id`, for example: `something.geojson` * { * "type": "FeatureCollection" * "features": [ * { * "type": "Feature", * "id": "p

(fc)

   * @param  `fc`  FeatureCollection-like Object containing custom locations
   */
  mergeCustomGeoJSON(fc) {
    if (!fc || fc.type !== 'FeatureCollection' || !Array.isArray(fc.features)) return;

    fc.features.forEach(feature => {
      feature.properties = feature.properties || {};
      let props = feature.properties;

      // Get `id` from either `id` or `properties`
      let id = feature.id || props.id;
      if (!id || !/^\S+\.geojson$/i.test(id)) return;

      // Ensure `id` exists and is lowercase
      id = id.toLowerCase();
      feature.id = id;
      props.id = id;

      // Ensure `area` property exists
      if (!props.area) {
        const area = calcArea.geometry(feature.geometry) / 1e6;  // m² to km²
        props.area = Number(area.toFixed(2));
      }

      LOCO._cache[id] = feature;   // insert directly into LocationConflations internal cache
    });
  }


  /**