On 10/01/18 14:49, Mark Goodge wrote:
I tried searching on OSM for a postcode, which I know exists, but it
returned zero entries from Nominatim. Other postcode searches work fine.
Can anyone tell me where Nominatim gets its data from for a postcode
search, and how often it's updated?
I assume it gets it from the map, in which case it gets updated when
mappers update it, which, for many places means that they have never
been provided.
The problem with postcodes is that they are owned by Royal Mail, who
consider them a valuable piece of intellectual property. Post codes get
entered into OSM based on post code centroid information that is release
through OS with a suitable sub-licence. As the result of extracting
post codes from signs on building, and similar sources, and as a result
of taking them from certain database with an open licence, where the
postcodes were contributed by the operators of the premises, in
particular, the Food Standards Agency's Food Hygiene Rating System database.
As such, it is very difficult to get reliable post codes for domestic
premises, as it would basically require a house to house survey.
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