[Talk-GB] Quarterly Project: Addresses and Postcodes

Robert Whittaker (OSM lists) robert.whittaker+osm at gmail.com
Wed Oct 18 16:41:09 UTC 2017

On 18 October 2017 at 16:43, Brian Prangle <bprangle at gmail.com> wrote:
> The latest iteration of your postcode mapping viusalisation tool is a great
> QA tool for filling in gaps. However - 2 questions

For anyone else reading, we're talking about

> What do the columns  S0 and S5  signify?

The s0 and s5 columns are the number of (geographic) postal sectors
with 0 or <5% of postcode units having at least one instance on an OSM
object. So if s0=1, then there's at least one postcode in every
(geographic) sector. If s5=0, then at least 5% of postcode units exist
in OSM for each (geographic) sector. (That's roughly explained in the
abbr tag titles on the page, but not all browsers expose those to the
user. I'll add some text under the table to clarify this, and also
explain what "Geo Units" is.) The idea of having those columns is that
getting those numbers down might be a motivating challenge for people.

> What made you stop using the geopunk website?

I originally only added it as a stop-gap as a quick way to display a
map of the area covered by each sector. I've now got my own sector
maps (albeit showing centroids rather than a boundary) but that
fulfilled the original need. geopunk seemed overly commercialised by
adverts for my personal taste and I didn't see it adding any value. Is
there something that was there that you're missing?

> Are we going to monitor progress with a taginfo script, like we did before?

I'm currently recording the s0, s5, "OSM units" (i.e. unique
postcodes) totals from http://robert.mathmos.net/osm/postcodes/stats/
along with the total number of OSM objects with postcodes and the
errors as quoted at
http://robert.mathmos.net/osm/postcodes/osm-errors.html every day. I
intend to do some graphs of these when I get some time. I'm not
currently storing any breakdown by postal area or district though.


Robert Whittaker

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