Does Google maps hate Birmingham?

Britain with a big magnifying glass over it.

I read something recently that suggested good content had provocative titles, which on closer inspection boiled down to phrasing them in the form of a question. That way you can also get away with titles that are complete lies, but draw people in, such as "does Facebook poison orphans?". I think I may have a promising future ahead of me in tabloid journalism.

Anyway, back to the point. Have you ever noticed how Google maps at certain zoom levels displays some places but not others? Have you ever wondered how they decide which places to show? Well, okay, probably not, but I have, so let's have a look at that.

Note: all of this may be subject to change - I have no idea how frequently or in what way Google updates their maps, but I can say that I first noticed what I'm about to describe several months ago, and things don't seem to have changed at all in the meantime.

I first noticed something odd when looking at the UK at this zoom level. Here's a screen cap of what I'm seeing now, in case it changes.

At this zoom, Gmaps shows the names of only these places in the UK:

  1. London
  2. Glasgow
  3. Bristol
  4. Liverpool
  5. Manchester
  6. Edinburgh
  7. Cardiff
  8. Brighton
  9. Plymouth
  10. Southampton
  11. Aberdeen
  12. Dundee
  13. Oxford
  14. Cambridge
  15. Inverness

You might think that there's nothing particularly interesting about this list, but if you live in the UK you might be surprised to notice that the city of Birmingham is not in it. This, despite the fact that Birmingham is the second largest city in the UK by some way, with a population of 1,224,136. Here's some data to consider.

City Population Size rank
London8,615,2461
Glasgow801,1983
Bristol617,2805
Liverpool552,2676
Manchester520,7397
Edinburgh482,0059
Cardiff447,28710
Brighton273,36920
Plymouth261,38422
Southampton253,65124
Aberdeen227,13029
Dundee160,30951
Oxford159,99452
Cambridge156,25255
Inverness48,201197

Source: The Geographist

So what's going on here? Gmaps might be showing the most populated places by county or regional area, but even then Birmingham is still the largest in its area, and Inverness doesn't even crack the top 10 in Scotland.

Google might also have ranked places based on how much physical space they occupy (a reasonable concept for a view from above) but I looked into this and unfortunately that data doesn't seem to be easy to get hold of. Perhaps because the actual boundaries of these places are difficult to measure? Regardless, Birmingham is still a contender for appearing on the map, considering how big it is, particularly compared with, say, Inverness.

It isn't until several zoom levels later that Birmingham finally appears, along with much smaller places like Hereford and Wrexham...

My limited expertise in geography starts to wane at this point, but let's take a look at another country just for interest. What about France? At the same zoom level, we see the following places.

City Population Size rank
Paris 12,341,4181
Lyon 2,214,0682
Marseille 1,727,0703
Toulouse 1,270,7604
Lille 1,166,4525
Bordeaux 1,158,4316
Nantes 897,7138
Strasbourg 768,8689
Rennes 690,46710
Grenoble 679,86311
Montpellier 569,95614
Tours 483,74318
Clermont-Ferrand469,92219
Caen 406,63322
Angers 403,67523
Dijon 377,59025
Brest 314,84430
Limoges 282,97136
La Rochelle126,43549
Carcassonnne no data
Basel no data

Source: About-France.com

Google seems to be doing much better in France, displaying the top ten and then nothing outside of the top fifty within twenty one cities. Clearly no problem here.

So what's going on with the UK?

If I'd found similar discrepancies in the France data I might be inclined to investigate a third country, but at this point I don't have much to go on. It's entirely reasonable to suppose that the algorithm Google Maps uses for which cities to display at different zoom levels is based on something sensible, and something likely determined automatically rather than manually. Perhaps a combination of generated output based on an even distribution of a manually input list of major population centres?

I'm of course completely guessing at this point, and there's not much use in that. After all this I'm left only with the same simple question I started with - does Google Maps know that Birmingham is the second largest city in the UK?

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