geocontext

import logger from '../logger.js'; import distance from '../helpers/distance.js'; import _ from 'lodash'; import { fetchJSON } from '../helpers/http.js'; // CADASTRALPARCELS.PARCELLAIRE_EXPRESS: // https://data.geopf.fr/wfs/ows?service=WFS&version=2.0.0&request=GetCapabilities export const PARCELLAIRE_EXPRESS_SOURCE = "Géoplateforme (WFS, CADASTRALPARCELS.PARCELLAIRE_EXPRESS)"; export const PARCELLAIRE_EXPRESS_TYPES = [ 'arrondissement', 'commune', 'feuille', 'parcelle', 'subdivision_fiscale', 'localisant' ]; /** * Filter items by distance keeping the nearest for each type. * * @param {array<object>} items * @returns {array<object>} */ function filterByDistance(items){ const sortedItems = _.orderBy(items, ['type', 'distance'], ['asc', 'asc']); const result = []; let lastType = null; for ( const item of sortedItems ){ if ( lastType == item.type ){ continue; } result.push(item); lastType = item.type; } return result; } /** * Get items from CADASTRALPARCELS.PARCELLAIRE_EXPRESS near of a given location. * * @see https://data.geopf.fr/wfs/ows?service=WFS&version=2.0.0&request=GetCapabilities * * @param {number} lon * @param {number} lat * @returns */ export async function getParcellaireExpress(lon, lat) { logger.info(`getParcellaireExpress(${lon},${lat}) ...`); // note that EPSG:4326 means lat,lon order for GeoServer -> flipped coordinates... const cql_filter = `DWITHIN(geom,Point(${lat} ${lon}),10,meters)`; const sourceGeom = { "type": "Point", "coordinates": [lon,lat] }; // TODO : avoid useless geometry retrieval at WFS level const url = 'https://data.geopf.fr/wfs?' + new URLSearchParams({ service: 'WFS', request: 'GetFeature', typeName: PARCELLAIRE_EXPRESS_TYPES.map((type) => { return `CADASTRALPARCELS.PARCELLAIRE_EXPRESS:${type}` }).join(','), outputFormat: 'application/json', cql_filter: cql_filter }).toString(); const featureCollection = await fetchJSON(url); return filterByDistance(featureCollection.features.map((feature) => { // parse type from id (ex: "commune.3837") const type = feature.id.split('.')[0]; // ignore geometry and extend properties return Object.assign({ type: type, id: feature.id, bbox: feature.bbox, distance: distance( sourceGeom, feature.geometry ), source: PARCELLAIRE_EXPRESS_SOURCE, }, feature.properties); })); }