[OSM-newbies] newbies Digest, Vol 27, Issue 3

[Donald Campbell II]

I can comment a bit on this part.  OSMarender is a collection of scripts and
software that read the info out of the database (or a part of it) and use
Inkscape to render the lines.  So it's sort of like it loops through and
goes "If the road type is "primary" draw a line of xxx thickness with ____
color from here to there" with various tables storing the color values and
sizes.  I'm not sure if Mapnik uses the same software to render, but they
all read the same data and simply output squares of a certain size showing
the roads within it rendered as a raster image.  (Although there are PDF
output generators as well).  So OSMarender does multiple renderings of the
areas, once for each zoom level, depending on the level it will include or
leave out certain details.

There's a premade OSMarender virtual machine with Linux and everything set
up that you can download.  It's just a matter of starting up a daemon
service and it will crank away rendering the tiles that need updating.
There's also a webpage that shows you the priority of tiles waiting in the
rendering pipeline and another page that lets you manually request a
re-render.  But all edits will be re-rendered automatically after a certain
amount of time.

-DC

From: "Ernst Radema" <Radema at xs4all.nl>
> Subject: [OSM-newbies] The BIG mapping picture
> To: <newbies at openstreetmap.org>
> o    What are OSMarender ( sounds like OpenStreetMaps ) and
>
> o    Mapnik rendering ?
>
> .         Tiling: maps are cut into tiles of 0,25 x 0,25 degrees on a
> Tile-server.
>
>
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