[OSM-newbies] tertiary dirt roads?

[Thomas Meller]

I see your point.
I have a solution for you, but you won't like it.

Do not tag for the renderer.
OK, you won't get in the way of a renderer if you make a map available for download onto GPSRs. But that's what you are going to do.

The solution is a bit complicated.
Maybe you will find some help by computerteddy.
He makes an extract of OSM's data for Europe and creates map tiles on a regular basis.
The process is like this:

- download the OSM Database
- cut into pieces
- extract to a shapefile format applying a conversion scheme in this step
- generate .img files
- create a style file for the GPSR
- put everything on a website for download

The shapefile export and conversion scheme makes what you aim at.
There, the definition is applied which object categories show up in which zoomlevel.
I did not fully understand the process, as I was not searching for a complicated solution. But you could define to show service roads in lesser zoomlevels there and create your own set of .img files.

The result will be a theme map for Canadian circumstances.

Tag the roads as highway=service, as this is the best fit for your description.

Good luck!

-------- Original-Nachricht --------
> Datum: Tue, 24 Nov 2009 10:50:07 -0700
> Von: James Ewen <ve6srv at gmail.com>
> An: newbies at openstreetmap.org
> Betreff: Re: [OSM-newbies] tertiary dirt roads?

> On Tue, Nov 24, 2009 at 8:14 AM, Thomas Meller <thomas.meller at gmx.net>
> wrote:
> 
> > If the way is usable as an interconnect for main traffic, I would not
> tag
> > it as 'unclassified', at least if it connects towns and alike, and not
> > (one or more) single houses. If it makes access to a wide landscape
> > possible, I would tag it as tertiary, maybe as unclassified if it's very
> narrow.
> 
> That's where we have a fundamental difference between Europe and
> Canada. I can show you hundreds of thousands of square kilometres of
> countryside with zero houses let alone towns or villages. The main
> reason for access into these areas is for access to natural resources,
> such as forestry cutblocks, natural gas wells, oil wells, and mineral
> mines. Also as a byproduct of all the traffic in the bush, you'll find
> roads accessing hilltops where radio towers and forestry look out
> towers are located.
> 
> My GPS navigator is designed for the regular motorist, who rarely
> leaves the paved roads. It becomes less than useful when out in the
> bush because most of these roads are not in the database. The OSM
> database, however has just about all of these roads, but the tagging
> scheme based on European standards would have us tag them all as
> little dirt paths in the bush, when in fact some of the main haul
> roads are much larger and better maintained than some of the
> government secondary highways.
> 
> My opinion is that we tag these major haul roads just below the
> secondary highway status, so that they show up on a map with an
> importance similar to the level that tertiary roads appear. This would
> mean that a user would be able to see that the road exist, and might
> make the choice to make the shortcut through the bush on a forestry
> road rather than add a couple hundred km of distance by using the
> government road network. Obviously things like surface type and
> condition would have a bearing, as some people might not appreciate
> taking their fancy sports car down a rough gravelled road where huge
> logging trucks might throw rocks up into their windshields. If the
> information however is obscured do to tagging information not showing
> the importance of the road, the user can't make that decision.
> 
> James
> VE6SRV
> 
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