On Aug 20, 2010, at 4:22 PM, simon blackmore wrote:

> Hi everyone,
> 
> I have just climbed the mountain of installing mapnik, postgres etc etc on OS 
> X.
> 

Congrats and welcome!

> It all seems to be working and now and I am keen to lean about controlling 
> the render process. Does anyone
> know a simple way to omit street names from the render.
> 

Labels are done within xml using the <TextSymbolizer /> 
(http://trac.mapnik.org/wiki/XMLConfigReference#Rule) so open the osm.xml and 
the xml files in the 'inc' folder and search for that. Then either just delete 
the <Rules> that contain them or find the <Style> that the TextSymbolizers are 
a part of, check its name, then find the <Layer> that uses that style and set 
the status of the layer to status="off" to disable the rendering of the layer.

I know that will sound really complicated, and the osm styles are really large, 
so you might want to get started rendering some simple styles and practice with 
them (http://trac.mapnik.org/wiki/XMLGettingStarted)

> I am guessing that its best to edit the osm.xml file but I am not quite sure 
> where to start.

It is the biggest, most sophisticated style around so don't start with it.

> I found some
> quite brilliant tutorials on getting Mapnik up and running but not so much on 
> this sort of thing.
> 
> Any tips or links would be very welcome.
> 
> At the moment I am rendering with this
> 
> $ ./generate_xml.py --dbname gis --user simon  --accept-non
> $ ./my_generate_image.py
> 

That does render the osm.xml, just does not require you do pass it as an 
argument. Try nik2img if you want that control on the command line.

> I think I need to pass the osm.xml file into the process but I am not sure 
> how to do that either.
> 
> Thanks for your help
> 
> Cheers
> 
> Simon
> 
> 
> 
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