[Talk-GB] Postcode data

Brian Prangle bprangle at gmail.com
Wed Jan 16 13:04:57 GMT 2013

Hi Aidan

You might like to get a volunteer to check a pilot import that's limited
within a manageable area - suggest a limited range of postcodes



On 15 January 2013 11:32, Aidan McGinley
<aidmcgin+openstreetmap at gmail.com>wrote:

> @Rob yes I had seen that.  It is a great tool, but as you say it's
> difficult to be absolutely sure that what you get back is accurate
> To summarise what I'll be looking at doing
> Filter the following from the ONS Postcode data:
>  - Postcodes which have a date of termination set
>  - Postcodes whose centroid is shared with other postcodes
>  - Postcodes which have a quality indicator other than "Within the
> building of the matched address closest to the postcode"
> Then match these filtered centroids to ways from Openstreetmap that have
> the following criteria:
>  - The way is closed
>  - The postcode centroid is inside the way
>  - The way does not already have a "addr:postcode" tag
>  - The way is tagged building=*
> There are future enhancements that can be done around tackling ways tagged
> amenity=* as per Rovastars comments, and reporting on postcode accuracy but
> the above is enough for the initial version I think.
> If there are no objections to the above, I will start work on optimizing
> the script and get in touch with the import mailing list to discuss how to
> actually tackle the task of importing the data.
> On 14 January 2013 19:54, Rob Nickerson <rob.j.nickerson at gmail.com> wrote:
>> Hi Aidan,
>> Sounds like you have thought this through to ensure that this "import"
>> will work well in practice. I would be more satisfied if imports were to
>> closed ways with building=* only (as mentioned by others).
>> Have you seen the Land Registry 'price paid' open data that includes
>> addresses and postcodes. Matt had a go at creating a simple tool that
>> matches their data to OSM address tags [1]. It's a great start, but be
>> aware that the "nearby houses" only matches on street name and number so
>> you can end up with addresses in different towns. Also it's quickest if you
>> specify at least the first number after the space (e.g. CV4+8)
>> Rob
>> [1] http://milliams.dev.openstreetmap.org/postcodefinder/landregistry/
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