observations = {
if(his_central_token == '') {
return []
}
return await d3.json(`https://gs-service-preproduction.geodab.eu/gs-service/services/essi/token/${his_central_token}/view/his-central/om-api/observations?limit=10000&west=${W}&east=${E}&south=${S}&north=${N}&ontology=his-central&observedProperty=http://ontology.his-central.geodab.eu/hydro-ontology/concept/40`)
}