To help with deciding where to do London mapping parties, I've updated this map which shows all the past locations:

It clearly shows we're not travelling out from the centre so much in recent years, but there are reasons for this. Back in 2008 we had target areas glowing in red on the nonames (streets mapped from yahoo where we needed to at least go get the names), and we headed out, sometimes beyond zone two, to zap them. Throughout 2009 this became quite difficult as the patches of remaining unnamed streets were too far out. These days they've all been obliterated, although I suspect the last pockets (such as Hillingdon) were probably filled in by people OS streetview copying without going there.

As we moved onto the next level of detail, it made sense to start in the city centre again. Actually it didn't quite happen like that. Various people pushed the detail limits in funny little localities, not necessarily in the centre. We can still see this very visibly with some patches of building coverage such as putney.

User Blumpsy still holds the record for the largest area of London mapped in HD, by mapping a massive area of Islington with all buildings and POIs. This shows up as a curious gap in the markers on my map, since we've avoided running any mapping parties in the area (didn't need to!)

But if you look a little to the south, you can see the expansion of the central London area of building coverage, which I like to think of as more of a collaborative effort (although my office is down there too) So we're not far off nicely assimilating Blumpsy's blob into the central London coverage. Hence the location around Pentonville Road for the cake diagram of...

...the next London Mapping Evening on Tuesday at Angel. Sign up! Sign up! You can sign up on MapCraft following the four steps I've described