[Talk-GB] London progress

Matthew Gates matthew at porpoisehead.net
Wed Apr 18 13:48:36 BST 2007


On Wednesday 18 April 2007 13:33, Dave wrote:
> People might be interested to know I've been collecting Greater London
> progress renderings for six months now.
>
> You can see all the pictures here:
> http://dev.openstreetmap.org/~random/london-progress/
>
> And the bit everyone wants, the animation showing the last 6 months:
> http://dev.openstreetmap.org/~random/london-progress/london-bimonthly.gif

That's beautiful!

> There's some really cool mapping going on. The coverage has more than
> doubled, and there's loads of interesting details appeared such as
> heathrow airport and just about every railway line there is!

Does this include the underground?  How do you get traces for that?

> If anyone is interested as to what it takes to render these images
> (they're done in one go, not stitched together from tiles):
>
> value in October -> value now
> .osm file size:  33MB -> 75MB
> .svg file size: 65MB -> 140MB
> CPU time (2.8GHz P4) 35 mins -> 2 hours 40 mins
> memory: 900MB RAM -> 1.6GB RAM + 250MB swap

Do you save out the data from josm, or have some way to query the database 
and get data from different dates?


Matthew




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