[OSM-dev] Various OSM troubles
Joerg Ostertag (OSM Munich/Germany)
openstreetmap at ostertag.name
Tue Jan 9 07:04:47 GMT 2007
On Tuesday 09 January 2007 01:00, Christoph Eckert wrote:
> > However there should be a check on the size, so that people do not
> > regularly download the planet just to see it is too big to digest for
> > them. Limiting requests to a tile size smaller than 1 arc degree
> > square should not be too onerous and combined with a meaningfull
> > error message should solve most of the problem. It is at least worth
> > a try before bringing mirrored dbs and new servers into play.
> I agree. The less hardware we need the better.
> So here's one further question: I always catch the area I'm mapping
> completely anew from the server. What if we had a kind of a "diff"?
Currently I don't think the bandwidth for downloading is the problem, but the
sql-query takes all the resources. So doing a diff probably only doubles the
> Imagine I keep my osm data locally. If JOSM starts, it loads that data
> file and then asks the server to deliver *only* the data that has
> changed since the last sync. This at least would save a lot of
> bandwidth, wouldn't it? This even is valid for the future as the user
> base grows.
This was something imi already suggested some times. He suggested writing a
local caching OSM-Server which starts with the current planet.osm and then
only get the updates. If the central OSM-Database is fast enough this
probably would really speed up things on the local machine. But we have to be
even more carefull with handling editing conflicts.
Jörg (Germany, Munich)
TeamSpeak2: ts2.ostertag.name, user: tweety, Channel: "GPS Drive"
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