[OSM-dev] road data in zoom levels

Shaun McDonald shaun at shaunmcdonald.me.uk
Wed Feb 11 13:59:20 GMT 2009

On 11 Feb 2009, at 13:51, Patrik Sjöberg wrote:

> On 11 feb 2009, at 13.42, Shaun McDonald wrote:
>> On 11 Feb 2009, at 12:14, 80n wrote:
>>> On Wed, Feb 11, 2009 at 11:39 AM, Patrik Sjöberg <patrik.sjoberg at bth.se 
>>> > wrote:
>>> Hi!
>>> What would be the best way to get data for ways at a specific zoom
>>> level? I would like all roads visible on zoom 5 for instance,  
>>> possibly
>> There is currently no predefined method for this. Each style will  
>> have a different set of things at each zoom level, so you will need  
>> to manually work out what you want.
> So the only way to go is to use the planet then?

Or country/region extracts.

Take a look at the extract section of the planet wiki page:


>>> with lower resolution (fewer nodes per way). I'm guessing something
>>> like http://www.informationfreeway.org/api/0.5/way[highway=*] but  
>>> the
>>> API's only seem suitable for quite small boxes.
>> You will also need to do the reduction in resolution yourself.
>>> The extended API might be what you are looking for: http://wiki.openstreetmap.org/wiki/XAPI
>> This will be useful for you if you are looking for small amounts of  
>> data. You don't say what you are trying to do with the data.
> We are developing a distributed simulations system of sorts and for  
> the visualization software we have a simple model of the earth. We  
> want some roads for simulated vehicles to run on. We only need a  
> small subset so far but preferably a global one. Maybe there are  
> other, smaller datasets more suited to our current needs out there.  
> Any suggestions?
>>> We're also trying to import the planet file to our own copy of the
>>> database with osmosis. We have some quite new 8-core Mac Pro's here
>>> for development but osmosis 0.30 is compiled with java version that
>>> does not seem to be available on osx yet so we are trying on some  
>>> old
>>> server instead. Would osmosis benefit enough from multicores that it
>>> would be strongly recommended to dedicate a Mac Pro (by booting in
>>> windows) for the parsing? Do you have any feeling of how long the
>>> import will take? We experimented with some simple ruby and sqlite  
>>> and
>>> calculated the time required to like 3 months ^^
>> You can't easily compile osmosis on Mac OS X, however you can run  
>> osmosis on Mac OS X without problems if you set the Java  
>> Preferences to use Java 6 instead of Java 5. (I'm assuming that you  
>> have the latest version of Mac OS X 10.5 installed, and you have  
>> all the updates.)
> Thank you! Completely missed that =)
> Osmosis doesn't seem to benefit much from the extra power though.
> Patrik
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