Greenvale NY (relation:174439)

[wambacher (Walter Nordmann)]

@dbgather

https://www.openstreetmap.org/relation/174439

Hi all,

I’m new to the OSM community (been awesome so far) and have been working on building some administrative area polygons (relations) for use in a personal project of mine. I’m currently working on grabbing the admin_level=8 relations in the state of New York. In doing so I’ve come across Greenvale, NY (relation:174439). My logic is failing because I’m unable to close the polygon properly since the first 2 member ways close before I get to the remaining ways.

Before I try to account for this I wanted to ask the community if this is standard or if this might be a mapping issue? I’ve cross checked with some other administrative boundary providers and in those worlds it is not two individual polygons. That said I’m assuming I should be able to handle these scenarios since this is what I’d imagine would be a similar use case for a country (e.g. United States).

Any info or guidance as to how I could/should mange this would be awesome!

For the sake of thoroughness some technical details below:

1. Using Osmosis to filter pbf files and convert them to OSM XML
2. Python to manipulate/parse OSM XML to identify relations and its boundaries to build GeoJSON

Thanks!

Hi,

at first: The boundary polygon was not valid because of a topological error in the south west:

i fixed that:

next: editing boundary relations as a newbie is NOT recommended. You need experience in doing that and you should use JOSM as preferred editor.

btw: which osm userid are you working with? “Ngp3”?

Last: you may download boundaries using https://wambachers-osm.website/boundaries

Regards
walter