问题 i am trying to get started with openstreetmap in R and try to replicate the example given in osmar package documentation. I get a bit data for munich. src <- osmsource_api(url = "https://api.openstreetmap.org/api/0.6/") muc_bbox <- center_bbox(11.575278, 48.137222, 1000, 1000) muc <- get_osm(muc_bbox, src) I get a subset of all highways in munich hways_muc <- subset(muc, way_ids = find(muc, way(tags(k == "highway")))) hways <- find(hways_muc, way(tags(k == "name"))) hways <- find_down(muc,