geocontext

import logger from "../logger.js"; import { fetchJSON } from "../helpers/http.js"; export const ALTITUDE_SOURCE = "Géoplateforme (altimétrie)"; /** * Get altitude for a given location. * * @see https://geoservices.ign.fr/documentation/services/services-deprecies/calcul-altimetrique-rest#1872 * * @param {number} lon * @param {number} lat * @returns */ export async function getAltitudeByLocation(lon, lat) { logger.info(`getAltitudeByLocation(${lon},${lat})...`); const url = `https://data.geopf.fr/altimetrie/1.0/calcul/alti/rest/elevation.json?lon=${lon}&lat=${lat}&resource=ign_rge_alti_wld`; try { const json = await fetchJSON(url); const elevation = json.elevations[0] ; return { lon: lon, lat: lat, altitude: elevation.z, accuracy: elevation.acc, }; }catch(e){ return { lon: lon, lat: lat, altitude: null, accuracy: 'No data', }; } }