They are indeed roads (black) and railways (red).

You need to render them at a very high resolution for them to 
actually appear as continuous lines.  I've been rendering my map 
tiles at 4096x4096 and then scaling them down to 1024x1024 using 
mogrify, which is a bit long-winded but just about preserves the 
line structures.

1024x1024 map tiles seem to work ok as long as you've also 
rendered corresponding low-res tiles, otherwise you'll blow out 
on mem when you zoom out.

LeeE


On Monday 24 April 2006 21:40, dene maxwell wrote:
> As far as I can work out, they're representations of road and
> rail...
>
> ...I stand to be corrected though
>
> :-D ene
> :
> >From: Michal Fabik <[EMAIL PROTECTED]>
> >Reply-To: [email protected]
> >To: [email protected]
> >Subject: [Flightgear-users] atlas question
> >Date: Mon, 24 Apr 2006 13:18:42 -0700 (PDT)
> >
> >Hi,
> >this is a question about Atlas but it's fairly simple
> >so please excuse my posting it to a FG list.
> >I've been wondering for a long time what those black
> >and red dots randomly scattered all over the map are.
> >Maybe it's not important, I'd just like to know,
> >thanks.
> >Michal
> >
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