Coda on shop completion rates on OSM

Thanks to John Baker (Rovastar) for a few suggestions discussing my recent blog post in the pub last night:

• What do the graphs of numbers of unique shop tags look like with heavier filtering of relatively poorly used tags.
• E-cigarette shops are a recent phenomenon, and should represent a genuinely novel tag rather than the mix of typos, synonyms etc which characterise much of the long tail of shop tags.

These were easy to follow up, so I present the graphs here:

Unique shop tags over time on OpenStreetMap for Great Britain,
filtered to remove tags with a restricted number of uses as at June 2017.

For virtually any level of filtering the curves level out around 2010-2011. Thus the core set of shop tags looks to be very stable. A good place to judge the extent of likely synonymy for shops in Britain is the LUA script used by SomeoneElse for his "Useful Maps".

Growth of mapped e-cigarette shops in GB on OSM

As expected e-cigarette shops first appeared rather late, at the end of 2013, and there are a decent number mapped (over 200 by mid 2017). I haven't checked, but I suspect the sharp increase in 2017 was caused by some tagging rationalisation. It's not unusal for new things to acquire a range of synonyms before tagging stabilises and one value becomes favoured. (It's equally true that in some cases this does not happen).

I've had a couple of other requests which it will take rather longer to look at, but if you have ideas relating to shops in Great Britain I can look at the data right now.

Segmentation of Retail Landuse: why do Germans only map shops?

Retail Landuse in Karlsruhe on OSM (scale 1:50k) :
both explicitly mapped and derived landuse polygons are shown, see below for methods.

The availability of lots of open data on various kinds of retail outlets has led to me doing a lot of maps of shops, restaurants, fast-food outlets and bars lately. I'm following in the steps of Paul the Archivist who mapped the Mansfield Road area close to pub meetings we had in 2011. I've got a nice workflow : I map my target area for an hour on Sunday morning, usually trying to get all retail establishments in a quite small area. I also try and collect as many house numbers as I can. I discovered my new mapping protocol, because my mother asked me to drive her to church a few weeks ago and I found it very productive. It also means I've been actively surveying in a neglected inner-city area.