The boundaries of Europe's constituent countries have changed a lot in my lifetime. Some countries don't exist anymore whilst others have come into existence. But it takes a map visualisation to make you realise just how much the map of Europe has changed.

Actually, it takes two map visualisations. The first, courtesy of the BBC, dates from 2005 and covers the years between 1900 and 1994. Starting wit Imperial Europe and fast forwarding though two world wars, plus the Cold War and taking in the collapse of the Communist Bloc and the expansion of the European Union.

These days there's so many ways that you can make a map. You can use a Javascript Maps API and put push pins on a slippy map. You can take vector data, transform it into JSON and use a different Javascript API to make an SVG map. You can load data from pretty much any source into either a desktop GIS or a visualisation tool. The possibilities are endless; maybe more endless than you might first assume.

Thierry Gregorius has helpfully put together a cut out and keep guide to which type of mapper you are.

Last night I made another map. It tries to answer some of more perplexing and confusing facets of the geography surrounding the world's 9th largest island. I mean of course Great Britain. No, wait. I mean the United Kingdom. No, wait. I mean Britain. Or do I mean England? See, it's confusing.

• So if the ISO 3166-2 code is GBR, how come the country is called the United Kingdom?
• But if England is a country and the United Kingdom is a country, how come England is part of the United Kingdom?
• What about Scotland, Wales and Northern Ireland?

This isn't the first time I've covered this topic. The first time was for a post on the now defunct Yahoo! Geo Technologies blog entitled UK Addressing, The Non Golden Rules Of Geo Or Help! My Country Doesn't Exist. The ygeoblog.com domain is now long gone and redirects to the Yahoo! corporate blog but I was able to reproduce this post here and it's also captured in the Internet Archive's WayBackMachine. The second time was when I made a variation of The Great British Venn Diagram. But this is the first time (though probably not the last) that I've used a map, which is odd as this is something that's tailor-made for a map.

Over the weekend I made another map. While I don't think for one moment this one will be as wildly popular as my last map was, this one is just as satisfying and a whole lot more personal.

At 8.01 PM on the 11th. of October 2009 I checked into Sushi Tomi in Mountain View, California. This was my very first Foursquare check-in. Since then I've checked-in on this particular location based service a further 12,394 times. Each check-in has been at a place I've visited. As this is a location based service, each check-in comes with a longitude and latitude.

This sounded to me like an ideal candidate for a map. But how to go about making one?

Last week's 10,00 ton and 55 feet's worth of meteor that exploded over and hit the Russian city of Chelyabinsk in the Urals made several thoughts go through my mind. In this order.

1. I feel for the 1200 people who were hurt and injured
2. Thank goodness it didn't happen where I live
3. With all the asteroids and smaller pieces of rock zooming over our head, this has got to have happened before, hasn't it?

Updated September 13th. 2012 with embedded YouTube video.

Wednesday September 5th. 2012 was a day of maps. To be precise, it was a day of maps, maps and MOAR maps. Two events, two talks, back to back. Packed choc-a-bloc full of maps. I also cheated slightly.

Firstly there was the International Cartographical Association's first session of the newly formed Commission on Neocartography. Cartography, neocartography, maps; what is there not to like? I'd previously spoken at the UK's Society of Cartographer's annual conference so it was great to be asked by Steve Chilton, SoC and Neocartography chair, to speak at the Neocartography Commission.

Just like RSS, the death of the map has been widely predicted, but to paraphrase Mark Twain, the death of both have been greatly exaggerated. Produce an online data set with some form of geospatial or location content and someone, somewhere, will produce a map of it.

Sometimes the resultant map leaves a lot to be desired, such as the recent UK government's attempts to map crime across the country. But sometimes, the map shows something much more interesting, topical and relevent, such as the use of social media in the recent events in Egypt.

Hypercities have produced a series of maps "for traveling back in time to explore the historical layers of city spaces in an interactive, hypermedia environment" and have now produced a map showing the Tweet stream during and after the stepping down of Egyptian government.

Back in December of 2009, I wrote about Paul Clarke trying to solve the problem of where's my train; that there must be a definitive, raw source of real-time (train) information and that

I assert that train operators know where their assets are; it would be irresponsible if they didn't

Whilst the plethora of train operators that fragmented from the ashes of the old British Rail network haven't answered this challenge yet, Transport for London has, opening up just such data as part of the London Datastore API. In today's age of talented web mashup developers, if you release an API people will build things with it if the information is useful and interesting and that's just what Matthew Somerville of MySociety did at the recent Science Hack Day ... a (near) realtime map of the London Underground showing the movement of trains of all of the Tube lines. A screen grab wouldn't do it justice and it takes a while to load, so a video grab might help here.