Property talk:P502

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HURDAT ID
identifier per HURDAT (North Atlantic hurricane database)

Description	Tropical cyclone identified in the NOAA AOML HRD's HURDAT database
Represents	HURDAT (Q5636186)
Data type	External identifier
Domain	According to this template: tropical cyclone [ tropical cyclone (Q8092)] items within the Atlantic, eastern Pacific, and central Pacific tropical cyclone basins According to statements in the property: cyclone (Q79602) When possible, data should only be stored as statements
Allowed values	(AL|EP|CP)\d{2}(1[89]|20)\d{2} (letters "AL," "EP," or "CP" followed, without a space, by a six-number string, the first two numbers indicating the storm number, and the last four indicating the year)
Example	Hurricane Sandy (Q264) → AL182012 Hurricane Hernan (Q498340) → EP102002
Source	Atlantic source full listing
Formatter URL	https://wikidata-externalid-url.toolforge.org/?p=502&url_prefix=https://www.nhc.noaa.gov/archive/&id=$1 https://www.nhc.noaa.gov/archive/$1/ (Can only link to list for year < 2005) https://www.nhc.noaa.gov/archive/$3/\L$1$2/ ("\L$1" is a lowercasing operator; so "AL182012" will be replaced with "https://www.nhc.noaa.gov/archive/2012/al18/")
See also	JTWC tropical cyclone ID (P3399), IBTrACS cyclone ID (P4540), Digital Typhoon typhoon ID (P5015), Digital Typhoon cyclone ID (P5016)
Lists	Items with the most statements of this property Count of items by number of statements (chart) Items with the most statements Items with the fewest statements Count of items by number of sitelinks (chart) Items with the most sitelinks Items with the most sitelinks, but no link to one Wikipedia (sample: Welsh Wikipedia, cywiki) Items with the fewest sitelinks Most linked wikis Items with the most identifier properties Items with no other external identifier Items with no other statements Most recently created items Items with novalue claims Items with unknown value claims Usage history (total) Usage history (main statement) Chart by item creation date Database reports/Complex constraint violations/P502 Database reports/Constraint violations/P502 Map Random list
Proposal discussion	Proposal discussion
Current uses	Total 1,768 Main statement 1,764 99.8% of uses Qualifier 2 0.1% of uses Reference 2 0.1% of uses
Search for values

[create Create a translatable help page (preferably in English) for this property to be included here]

Distinct values: this property likely contains a value that is different from all other items. (Help)

List of violations of this constraint: Database reports/Constraint violations/P502#Unique value, hourly updated report, SPARQL (every item), SPARQL (by value)

Single value: this property generally contains a single value. (Help)

Exceptions are possible as rare values may exist. Exceptions can be specified using exception to constraint (P2303). Known exceptions: Hurricane Cesar–Douglas (Q3137650), Hurricane Irene–Olivia (Q1473273), Hurricane Fifi–Orlene (Q3243984), Hurricane Greta–Olivia (Q7485697), Hurricane Joan–Miriam (Q8349158), Tropical Storm Hermine (Q1141228), Hurricane Ruby (Q64212557)
List of violations of this constraint: Database reports/Constraint violations/P502#Single value, SPARQL

Format “(AL|EP|CP|WP)\d{2}(1[89]|20)\d{2}”: value must be formatted using this pattern (PCRE syntax). (Help)

List of violations of this constraint: Database reports/Constraint violations/P502#Format, hourly updated report, SPARQL

Type “cyclone (Q79602)”: item must contain property “instance of (P31)” with classes “cyclone (Q79602)” or their subclasses (defined using subclass of (P279)). (Help)

Exceptions are possible as rare values may exist. Exceptions can be specified using exception to constraint (P2303). Known exceptions: October 1999 Mexico floods (Q7076905)
List of violations of this constraint: Database reports/Constraint violations/P502#Type Q79602, SPARQL

Scope is as main value (Q54828448): the property must be used by specified way only (Help)

List of violations of this constraint: Database reports/Constraint violations/P502#Scope, hourly updated report, SPARQL

Allowed entity types are Wikibase item (Q29934200): the property may only be used on a certain entity type (Help)

Exceptions are possible as rare values may exist. Exceptions can be specified using exception to constraint (P2303).
List of violations of this constraint: Database reports/Constraint violations/P502#Entity types

Check correspondence between the year in the identifier and the year of the event
Check when the ID contain the year (Help)
Violations query: SELECT ?item { ?item wdt:P502 ?value. ?item wdt:P580 ?begin. BIND (YEAR(?begin) AS ?beginYear). BIND (SUBSTR(?value, 5, 4) AS ?substr). FILTER (STR(?beginYear) != ?substr) }
List of this constraint violations: Database reports/Complex constraint violations/P502#Check correspondence between the year in the identifier and the year of the event

Data type External identifier?

The property HURDAT HURDAT ID (P502) is described as an identifier per HURDAT (North Atlantic hurricane database) The property has datatype String. But is is described With Wikidata property for authority control (Q18614948). Should the Property therefore have datatype External identifier? Pmt (talk) 21:46, 25 September 2018 (UTC)

• I think the main reason this was initially skipped is that the link varies based on its value. In the meantime, the redirector service takes care of that so this could easily be converted. As you already advertised it on project chat, you might want to Wikidata:Contact the development team and ask for conversion. --- Jura 08:46, 6 October 2018 (UTC)

Proposal - Change Data type of HURDAT ID (P502) from String to External identifier

I think String is the wrong type for HURDAT ID (P502). Can we please change it to be External identifier.

As per Help:Data_type#Changing_datatype please indicate support/opposition below. Iwan.Aucamp (talk) 16:52, 15 October 2019 (UTC)

Discussion

•  Comment for your attention @Pmt: Iwan.Aucamp (talk) 17:08, 15 October 2019 (UTC)
•  Support This one makes sense. ArthurPSmith (talk) 17:24, 15 October 2019 (UTC)
•  Support. Andy Mabbett (Pigsonthewing); Talk to Andy; Andy's edits 18:34, 15 October 2019 (UTC)