[MapProxy] MapProxy OSM Configuration Question

Paul Todd ptodd at tapestrysolutions.com
Thu Aug 16 17:02:28 PDT 2012

I've been setting up an Ubuntu 10.04 OSM Mapserver with the planet loaded from IMPOSM.  We want to use MapProxy to cache the first several layers and are running into a few issues.  This is a reasonably big machine with 32 GB ram and 4 cores; 6 TB raid.

1)      Issues seeding low zoom caches - performance is pretty poor in general for low zoom levels using MapServer directly; however it still appears to work and render very nice transparent PNGs

a.       We've divided the world into 4 caches to help split up the seeding job

b.      When trying to seed these levels using the MapProxy seeder some areas work, other cause the system to run out of memory and kill the process (oom-killer)

c.       We've tried seeding using WMS source and MapServer source; same issues either way.

2)      The PNGs served by MapProxy do not have nearly the quality that MapServer does.  The tiles that are cached in 900913 on the server look great but the client requests them in 4326 and the reprojection looks jagged.  We switched it to 24Bit PNG using the modified PIL that the MapProxy documentation suggested and it looks better but not as good.  However I would expect that using the modified imaging library we should be able to use 8 bit PNGs and get good results.

I'm open to suggestions from some more experienced users in best ways to accomplish 1 and 2 above.


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