My morning's reading today has been dominated by a map image that the UK's Environment Agency released on December 6th that, to quote the Tweet, shows "the extent of potential flooding of London if the Thames Barrier wasn't in place". If you know London at all, it's certainly an arresting image but like so many times when I encounter a map, I want to interact with it, move it, see whether where I live in London would have been impacted. So I started investigating.

Some background context is probably in order. On December 5th. the UK's Met Office issued severe weather warnings for the East Coast of England. A combination of a storm in the Atlantic to the north of Scotland, low atmospheric pressure and high tides were all combining to push a massive swell of water through the narrows of English Channel, in effect squeezing the water through the Dover Strait. As the North Sea and English Channel are relatively shallow, the sea would back up and had the potential to flood large areas of the East Coast of England as well as the areas surrounding the tidal stretch of the River Thames and that means London and possibly even where I live in Teddington, which marks the upper limit of the tidal Thames. Thankfully for those of us who live West of Woolwich, the Thames Barrier exists to protect London from such flooding, though I'm sure this is less of a comfort to those people who live to the East of the barrier.

The Greek Philosopher Heraclitus was fond of saying "the only constant is change" (actually he said "nothing endures but change" but let's not split hairs). He probably wasn't talking about meetups and get-togethers in London but this still fits rather well. Events come and go as their themes either go mainstream or fade. But some remain and London's #geomob is one of those.

Started in 2008 by fellow WhereCamp EU co-conspirator Chris Osborne, #geomob was conceived as London's answer to Silicon Valley's popular (and still running) WebMapSocial meetup group. After a brief hiatus in May 2010 when Chris hung up his hat and offered the event to anyone willing to spend the time and effort in running it, #geomob restarted in September of the same year, this time fed and watered by Ed Freyfogle and Vuk Trifkovic of Lokku, the people behind Nestoria and Open Cage Data. It's been going strong ever since.