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I used QuickOSM / QGIS to grab some place data but the polygon / coordinates are not matching the original on OSM (nominatim). This is "Olive Garden" in Schaumburg IL. On OSM is is the below left image. After downloading / exporting using QuickOSM / QGIS it is the right image. I've not changed any setting. CRS is default 4326 W84.

On OSM the polygon is starting as: [-88.0332509,42.0502153]...
The exported QuickOSM / QGIS one is starting as: [-88.0332143, 42.050252]...

How to export this to match the original coordinate at OSM?

enter image description here

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  • I just tried the query "name=Olive Garden" IN "Schaumburg IL". It works well for me, EPSG 4326. Which OSM source background are you using? My first coordinate is [ -88.0332143, 42.050252 ] which is the same as in OSM openstreetmap.org/node/1483640394#map=19/42.05015/-88.03304
    – etrimaille
    Commented May 30, 2020 at 7:48
  • Source background as in the URL? It's overpass.openstreetmap.fr/api Did your polygon match? I'm matching it using geojsonlint.com
    – Mike
    Commented May 30, 2020 at 8:25
  • That's why I was asking your background URL? Why wouldn't it be a problem with Mapbox background? Or geojsonlint.com ? I downloaded the polygon with QuickOSM, which gives me [ -88.0332143, 42.050252 ] which is the same as openstreetmap.org/node/1483640394#map=19/42.05015/-88.03304 in QGIS, the OSM background matchs perfectly with QuickOSM result. Have you tried in QGIS and checking coordinates from QGIS?
    – etrimaille
    Commented May 30, 2020 at 9:25
  • Ok I found the issue, it is not QGIS. The polygon on OSM is incorrect itself because it's not correctly laying on the underlining place exactly. Can't notice it on OSM because there is no building boundary on their map but when checked on other sites which have the building boundary I see the polygon is off. But thanks for your help.
    – Mike
    Commented May 31, 2020 at 4:50
  • It's possible to have building boundary on OSM.org. You need an account and then you can turn on/off imagery (building boundary), it has many providers available. Depending on the background provider, the building is fine in OSM. Keep in mind that's a rare to have single imagery provider with 100% correctness. So it's sometimes needed to do an average between different providers.
    – etrimaille
    Commented May 31, 2020 at 8:33

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