[OSM-dev] what server next?

Iván Sánchez Ortega ivan at sanchezortega.es
Tue Sep 8 11:49:51 BST 2009

El Martes, 8 de Septiembre de 2009, Micha Ruh escribió:
> A server calculates user contribution for sets of 3x3 tiles (supertiles)
> for each zoom level 12-18.

Meh. Precalculating all that would be too time-consuming. I'd rather go 8x8 
mod_tile-like meta-tiles and a real-time API for z>12, with a cache on top. 
Heck, you could even do just z12 tiles and get away with that.

> The calculation is done once a week (maybe done by t at h clients).

Meh. Mark the cache as dirty every week. And if mod_tile+mapnik can render 
stuff in near-real-time, there is no reason you could not just count stuff in 

Heck, mod_tile has to load data for 8x8 meta-tiles every time a meta-tile is 
marked dirty. Use that opportunity to count the attribution data there: just 
add a couple of fields to osm2pgsql and make mod_tile count the attribution 

> Users adding  ways/pois get a score of 3 per way/poi 
> added, users adding more tags to existing way/pois get a score-point of 1
> for each edit. Import sources get a 0.1 score-point per way/poi.

Good luck telling those apart, given a planet dump. Why not just 1 
node/way/relation = 1 point??

> OpenLayer gets extended in a way that while requesting tiles an additional
> request to the attribution-db is issued, contributors for the corresponding
> supertile get loaded and nicely presented in the lower right corner of the
> view.

No need to. A bit of javascript magic can do that.

Iván Sánchez Ortega <ivan at sanchezortega.es>

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