On 19/07/2019 15:15, Andrzej wrote:
Indeed, Code-Point Open is less than ideal, the issues are almost
always caused by lack of differentiation between residential and
"large user" postcodes. On the other hand, it is the only legal
source of postcodes we have, other than local knowledge, but the
latter is realistically limited to a dozen or so postcodes per
mapper. Businesses website could also be OK but they are usually
copyrighted. Derived databases, like FHRS, are generally not OK, a
unless also permitted by Royal Mail.
ONS postcode products are also OGL, so can be reused in OSM and similar.
They're also more useful than Code-Point Open in that they also include
lookups to a number of other government codes (such as local authority
GSS codes). It also differentiates between "large user" and normal
postcodes, and includes an introduction date and, where applicable, a
termination date for every valid postcode. And, unlike Code-Point Open,
the ONSPD has a persistent URL that can be used to automate updates.
https://hub.arcgis.com/datasets/ons::ons-postcode-directory-latest-centroids
More generally, the ONS open data geography datasets are a goldmine.
Another useful one is the Index of Place Names; that has obvious utility
for OSM as a means of verifying the official spelling of names entered
by mappers.
Mark
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