[Talk-GB] Armchair-mapping postcodes (was: B72 is a wrap)

Andy Robinson (blackadder-lists) ajrlists at gmail.com
Tue Feb 15 17:49:35 GMT 2011

Ed Avis [mailto:eda at waniasset.com] wrote:
>Sent: 15 February 2011 5:40 PM
>To: talk-gb at openstreetmap.org
>Subject: Re: [Talk-GB] Armchair-mapping postcodes (was: B72 is a wrap)
>Andy Robinson (blackadder-lists <ajrlists at ...> writes:
>>>I see - so you can use your judgement to work out the area of a
>>>postcode based on its centroid and the streets and buildings nearby.
>>It's not that simple. You need to do the ground survey first to get the
>>house numbers and work out which property "belongs" to which street.
>Ah, right.  I thought it sounded too good to be true!  Jerry C. also
pointed out
>that house numbers have to be present.
>So the ground survey is to add the house numbers - or I suppose just
>addr:street would be sufficient in most cases? - and then the armchair part
>putting those together with the code point data to find buildings in a
>OSM's coverage of streets is much better than its coverage of buildings.
>Might it make sense to tag postcodes on ways?

Nope, streets often have more than one postcode for the properties on that
street. It's not the street that has a postcode anyway, it's the delivery
points for the mail, i.e. the letterbox in your front door. Hence why I only
tag the building with the full postcode.


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