[OSM-talk] rendering some large maps, e.g. whole world

[Torsten Mohr]

Hello,

i installed PostgreSQL / PostGIS and use a modified version of this
script to render maps:

svn.openstreetmap.org/applications/render/mapnik/generate_image.py

I've just created two maps of Germany, one is 12000 x 16000, the other
is 3000 x 4000.  I then get two different 'levels of detail', as expected.

I'd like to print a map of Germany as a poster.  My understanding is that
osm.xml is configured to create maps that look fine on a screen.
But the Pixels per Inch on a computer monitor are different compared to
the PPI on a printed poster.
So e.g. text size, symbol size and others may not look optimal when printed.

Has anybody got any experience with changing osm.xml to create maps
that look fine when printed (readable text, ...)?

Or do i worry too much and printing PNGs looks just all right?


2.
When rendering the whole world with coordinates like this:

# unused:   ll = (4.5, 46, 16, 56) # Germany
    ll = (-180.0, -90.0, 180.0, 90.0) # World

Then i just get an empty file (just background).

Is this related to the scale denominators in osm.xml?

Can anybody give me a hint on what values to use when printing
the whole planet?



Thanks for any hints,
Torsten.