Hello everyone, I've been interested in proposing a change to Carto's style (Mapnik's main style) to allow visual identification of unpaved roads for any kind of road, much like the Humanitarian style does, which bases this decision on values of the surface tag. The Brazilian community has shown interest on this many times, since lack of this feature causes unaware users to classify roads incorrectly. David Bannon proposes (below) that we use the tracktype tag for that instead, but I've never seen it being used for anything besides roads with highway=track (therefore, not a very common practice it seems). Do you think we should encourage its use in conjunction with unclassified, tertiary, secondary and primary highways?
It seems to me that surface=compacted is quite similar in meaning to tracktype=grade1 (whereas surface=sand, surface=dirt, and others, could be equated with other grades but rarely with grade1, particularly because the "compacted" value exists) and so both tags could be used for the same rendering purpose. Do you agree? I've seen people from different countries requesting different things on this topic: some would consider even a sett street "unpaved" (therefore, requiring special rendering), but it seems that a "compacted unpaved" road is the limit with which few would disagree. Finding the right universal threshold (if there is only one) is still pretty much debatable, so opinions are appreciated. ---------- Forwarded message ---------- From: davidbannon <notificati...@github.com> Date: Tue, Dec 31, 2013 at 4:02 AM Subject: Re: [openstreetmap-carto] Render paved/unpaved (#110) To: gravitystorm/openstreetmap-carto <openstreetmap-ca...@noreply.github.com > Cc: ftrebien <fernando.treb...@gmail.com> I am not sure the tag surface= is the right one here. It has a lot of possible values, and a lot of them in use. We'd need a look up table to decide what to do. Better, in my humble opinion to use the tracktype= tag. This tag is intended to show what state the road is likely to be in and thats the information a user really needs. Further, this tag is very widely used. The Australian Tagging Guidelines on OSM discusses this ( http://wiki.openstreetmap.org/wiki/Australian_Tagging_Guidelines#Unsealed_and_4wd_Roads_.28Dirt.2C_Gravel.2C_Formed.2C_etc.29) and believes that any road with tracktype= asserted needs to be shown so people are aware its not a sealed road. Please remember that highway= type tags should show what a road is is intended for, further information is needed if the surface of that road is not what might be expected ! This is particularly important in places like the Australian Outback where long distances are involved. Many people have died as a result of them underestimating their ability to use a particular road. I don't want to see OSM mentioned in a coroners report. David — Reply to this email directly or view it on GitHub<https://github.com/gravitystorm/openstreetmap-carto/issues/110#issuecomment-31385094> . -- Fernando Trebien +55 (51) 9962-5409 "The speed of computer chips doubles every 18 months." (Moore's law) "The speed of software halves every 18 months." (Gates' law)
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