Re: [talk-au] surface=unsealed in 4wd/dirt road tagging

2013-07-02 Thread David Bannon

On 03/07/13 08:52, Steve Bennett wrote:
FYI, the map style I'm working on for cycle touring does make this 
distinction: http://emscycletours.site44.com/map2.html#egrt 

Nice work !

You might be right - but on a technical front, it's no more burdensome 
to show all of [unsealed, unpaved, gravel, dirt] as a dashed line 
rather than just, say, unpaved. Steve 
Are you rendering that with Mapnik ? I planned to do something similar 
to show the "Guardians of the Slippery Map" how cool it was but found it 
non trivial and have not had time to get back to it.


David

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Re: [talk-au] surface=unsealed in 4wd/dirt road tagging

2013-07-02 Thread Steve Bennett
On Wed, Jul 3, 2013 at 9:03 AM, Ian Sergeant  wrote:
> Surprising stat.  Especially considering paved is considered the default.

Yeah - I try to specify it wherever possible though, outside cities.

> I really like multi-level tags.
>
> natural=water
> water=lake
>
> surface=unpaved
> unpaved=gravel
>
> surface=paved
> paved=asphalt
>
> It makes it easy for people two write simple parsers without enumerating the
> options, but people who are want to parse the details to do so.
>
> There are a number of instances when OSM uses this type of multi-level
> tagging scheme, but it lacks any form of consistency.

Agreed on all counts. There are a lot of people who still think the
best thing to do is make up new tags on the fly and to encourage
others to do the same.

Steve

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Re: [talk-au] surface=unsealed in 4wd/dirt road tagging

2013-07-02 Thread Ian Sergeant
On 3 July 2013 08:52, Steve Bennett  wrote:

>
> Also a quick stat for you. 165,000 highways in Australia have a
> surface tag. 718,000 don't.
>
>
Surprising stat.  Especially considering paved is considered the default.


> it's no more burdensome
> to show all of [unsealed, unpaved, gravel, dirt] as a dashed line
> rather than just, say, unpaved.
>


I really like multi-level tags.

natural=water
water=lake

surface=unpaved
unpaved=gravel

surface=paved
paved=asphalt

It makes it easy for people two write simple parsers without enumerating
the options, but people who are want to parse the details to do so.

There are a number of instances when OSM uses this type of multi-level
tagging scheme, but it lacks any form of consistency.

Ian
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Re: [talk-au] surface=unsealed in 4wd/dirt road tagging

2013-07-02 Thread Steve Bennett
On Tue, Jul 2, 2013 at 8:42 PM, David Bannon  wrote:
> Just a thought here, we'd really like "the renderers" to show
> unpaved/unsealed/whatever roads differently from sealed ones. In particular,
> the mapnik rendered slippery map on the OSM website

FYI, the map style I'm working on for cycle touring does make this distinction:
http://emscycletours.site44.com/map2.html#egrt

Also a quick stat for you. 165,000 highways in Australia have a
surface tag. 718,000 don't.

> They show little interest I must admit but will show even less if we point
> to a whole range of surface= tags that need that treatment. So might be
> better agreeing on one term rather than being very specific and saying
> 'dirt', 'gravel'  etc. As I have mentioned before, this is a road safety
> issue as much as a presentation one.

You might be right - but on a technical front, it's no more burdensome
to show all of [unsealed, unpaved, gravel, dirt] as a dashed line
rather than just, say, unpaved.

Steve

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Re: [talk-au] surface=unsealed in 4wd/dirt road tagging

2013-07-02 Thread David Bannon

On 02/07/13 17:58, Steve Bennett wrote:

  If people want to be specific with surface=dirt,
surface=gravel then that would be different.
Just a thought here, we'd really like "the renderers" to show 
unpaved/unsealed/whatever roads differently from sealed ones. In 
particular, the mapnik rendered slippery map on the OSM website


They show little interest I must admit but will show even less if we 
point to a whole range of surface= tags that need that treatment. So 
might be better agreeing on one term rather than being very specific and 
saying 'dirt', 'gravel'  etc. As I have mentioned before, this is a road 
safety issue as much as a presentation one.


I like the idea of 'unpaved', it gets heaps of use internationally and I 
should update the mapnik request accordingly...


David




So - yes, go ahead. :)

Steve

On Sat, Jun 29, 2013 at 11:18 AM, Ian Sergeant  wrote:

Hi,

I know we had some discussion over 4wd/dirt road tagging.

This ended up in the wiki as a recommendation to use

surface=unsealed

http://taginfo.openstreetmap.org/tags/surface=unsealed

I really can't see a significant reason here not to stick with

surface=unpaved

http://taginfo.openstreetmap.org/tags/surface=unpaved

When it is so much more likely to used, and therefore so much more likely to
be rendered, navigated, etc.  There are the other surface=* tags that can be
used if more specific information is available, but surface=unsealed is
obscure to no benefit IMO.

If there are no objections, I'll update the wiki.

Thanks,
Ian.

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Re: [talk-au] surface=unsealed in 4wd/dirt road tagging

2013-07-02 Thread Steve Bennett
Hi Ian,
  I don't think "unsealed" communicates anything that "unpaved"
doesn't. If people want to be specific with surface=dirt,
surface=gravel then that would be different.

So - yes, go ahead. :)

Steve

On Sat, Jun 29, 2013 at 11:18 AM, Ian Sergeant  wrote:
> Hi,
>
> I know we had some discussion over 4wd/dirt road tagging.
>
> This ended up in the wiki as a recommendation to use
>
> surface=unsealed
>
> http://taginfo.openstreetmap.org/tags/surface=unsealed
>
> I really can't see a significant reason here not to stick with
>
> surface=unpaved
>
> http://taginfo.openstreetmap.org/tags/surface=unpaved
>
> When it is so much more likely to used, and therefore so much more likely to
> be rendered, navigated, etc.  There are the other surface=* tags that can be
> used if more specific information is available, but surface=unsealed is
> obscure to no benefit IMO.
>
> If there are no objections, I'll update the wiki.
>
> Thanks,
> Ian.
>
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