[OSM-dev] Slippy Map Layer with Maplint output

[Frederik Ramm]

Hi,

> It would be great if Tiles at Home could render maplint style tiles, and if
> that were combined with a special request that works like this one:
> http://www.informationfreeway.org/?lat=7347739.31466&lon=-155530.2096&zoom=15&layers=B00

Agreed. I have seen that OJW has already designed the tile metadata 
structure with the possibility of multiple layers in mind; a few changes 
to the upload scripts, and it would be possible to upload "normal" as 
well as maplint layers.

Of course one could also have maplint on a completely different system 
but it would be more efficient to calculate tiles for all layers from 
one set of data that you downloaded.

However the whole client-server interaction would grow more complex. If 
we required each renderer to have maplint installed and do maplint tiles 
at the same time it does osmarender, then it would be ok, but if we have 
to start negotiations between server and client about which layers to 
render and whether the client is equipped, that would be a nightmare.

Also, I think that maplint "tests" are perhaps not mature enough to use 
them everywhere. A maplint layer for your local area is only worth 
something if you can go over all the highlighted things and fix them, so 
that anything highlighted the next time you look demands investigation. 
Currently, maplint will probably highlight a lot of things which you 
deem correct. (For example: Karlsruhe has no railway=tram, only 
railway=light_rail. We can create a test for that, but you wouldn't want 
to use that globally.)

Theres a pretty cool alternative we could develop: A sort of OSM 
community server, where anybody can set up a local "community" by 
defining some map extents and maybe a set of maplint rules and 
osmarender styles, and then people mapping that area could log in there, 
see their current maplint output, current slippy map, and anything else 
of interest. The rendering work behind that would still have to be done 
by a tiles at home-style system, but that would need to become more 
complex, so that styles and rules could be transmitted together with a 
rendering request... but that's perhaps a bit far away.

> http://dev.openstreetmap.org/~ojw/Log/Requests/ seems to be empty most
> of the time, I think tile at home has a plenty of spare capacity to do this
> at the moment.

Don't overestimate it - as soon as metadata is avaialable again, I will 
continue running my weekly "find all tiles that need updating according 
to lates planet.osm" job, and this usually fills up the queue for 24 hours.

Bye
Frederik

-- 
Frederik Ramm  ##  eMail frederik at remote.org  ##  N49°00.09' E008°23.33'