Are node ids unique in the planet osm data? If not, are they unique for a geography such as country? When a node is added to a way, does that change the osm_id of the remaining nodes? asked 11 Jul '19, 20:02  Maneesh |
2 Answers:
Node IDs are indeed unique. Note however that node IDs, way IDs and relation IDs are separate spaces, so node 537, way 537 and relation 537 can co-exist. answered 11 Jul '19, 20:31  Richard ♦ |
Answering your second question, no, object IDs aren't dynamic. An existing object (be it a node, way or relation) will keep the same ID unless it gets deleted and recreated as a new object. Object IDs aren't necessarily static, though. Like I said above, someone could delete an OSM object and create a new object representing the same real-world item, which would now have a different ID. If you're wondering if you can use the OSM ID to refer to a POI, the answer is that this may work in the short term, but it isn't guaranteed to always work because someone could change the data at any point. answered 11 Jul '19, 22:42  alester |
