|ID of the Wikidata item about each of the flags hoisted on the flagpole|
|Used on these elements|
|Status: in use|
|Tools for this tag|
How to tag
The value should be a Wikidata item identifier, including the "Q" prefix.
The Wikidata item should have a claim of being an instance of a flag (either directly or indirectly). In other words, it should be the item for the flag, not the government or organization that the flag represents.
A few very tall flagpoles are notable enough for their own Wikipedia articles and thus their own Wikidata items. The Wikidata QID representing the flagpole itself goes in wikidata=*.
- For flag:type=regional, flag:type=organisation, etc., the specific flag cannot be inferred from the flag:type=* and country=* tags alone. A renderer might guess a flag based on the flagpole's location, but a flag for one region may fly in a neighboring region for many reasons.
- The flag of South Vietnam is still commonly flown in some regions with large overseas Vietnamese communities. The flag would be tagged flag:type=national country=VN, because South Vietnam had the ISO 3166-1 alpha-2 code
VNbefore it was repurposed for a unified Vietnam. But a renderer that only considers country=* would draw the present-day flag of Vietnam, which is politically incorrect and highly sensitive in some regions. So flag:wikidata=Q1740429 allows renderers to render the correct flag.
- At some monuments in the United States, the flag flown has fewer than 50 stars or more than 13 stripes. A Wikidata QID for the Betsy Ross flag or any of its successors allows renderers to render a historically accurate flag.
Creating a Wikidata item
Sometimes you may need to create a Wikidata item to represent the flag you're mapping. Note that Wikidata items are subject to the Wikidata notability policy, which is stricter than OpenStreetMap's inclusion standards. A flag can be mapped in OSM as long as it exists on the ground – even if it's a one-off, such as the logo of an obscure secondary school athletic team on a white field, or a vanity flag. But such flags are unlikely to be considered notable for Wikidata.
Even if the flag is commonplace, you should take one or more of these steps to ensure that the Wikidata item looks notable enough so it doesn't get deleted:
- The easiest way is to link an existing item to it. For example, if you're creating an item for flag of the Los Angeles County Sheriff's Department (Q65741971), add a flag (P163) statement to Los Angeles County Sheriff's Department (Q3259709) pointing to Q65741971. You can also create a represents (P1268) or applies to jurisdiction (P1001) statement linking in the other direction.
- If there isn't an existing item for the represented organization, search Flags of the World for the flag in question. If FOTW has a dedicated page about the flag, add the flag's ID to the Wikidata item. For example, the Wildomar city flag's FOTW page has a URL ending with
us-cawld.html, so flag of Wildomar (Q65740307) has a Flags of the World ID (P3089) statement set to
- If Flags of the World doesn't have a page dedicated to the flag, find a third-party published source mentioning the flag. Any news article will do. Add a citation to the instance of (P31) statement. Set the citation's URL (P854) property to the URL of the source.
Beyond the bare minimum, a good Wikidata flag item can also have image (P18), color (P462), and aspect ratio (P2061) statements, which allow the renderer to display the correct design and can help a future mapper verify that the same flag is still flying at a particular flagpole.