I'm only aware of one way to set up styles in mapnik, which is to state the 
pixels width(and I could be wrong in this)

<LineSymbolizer>
        <CssParameter name="stroke">white</CssParameter>
        <CssParameter name="stroke-width">.5</CssParameter>
</LineSymbolizer>

I'm not sure exactly what is happening in the pdf output in relation to 
sizing...

I think it is stuck at 96ppi


----
Jay 


----- Original Message -----
From: "Chris Barker" <[EMAIL PROTECTED]>
To: "Jay Douillard" <[EMAIL PROTECTED]>, [email protected]
Sent: Monday, November 24, 2008 4:33:55 PM GMT -08:00 US/Canada Pacific
Subject: Re: [Mapnik-users] 300 dpi images with Mapnik?

Jay Douillard wrote:
> I've added a page to the trac wiki around this topic
> 
> http://trac.mapnik.org/wiki/ScaleAndPpi
> 
> Please consider it a first draft!

Good start.

What I'd like to see is a little description of how you describe the 
size of things. The geo-data itself should get scaled appropriately but 
how do you specify the width of lines, size of text, etc? If you specify 
in pixels that's straightforward (but what is it for a scalable output, 
like pdf?) if you specify in inches, points, or mm, then you need to 
somewhere specify the PPI, or if it is indeed fixed at 96ppi, then you 
need to scale stuff yourself. What are the options with mapnik?



-Chris


-- 
Christopher Barker, Ph.D.
Oceanographer

Emergency Response Division
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