Thanks for the feedback. Regarding road classifications can I suggest the following:
OSM uses six levels of highway classification for roads for motorised vehicles going from motorway at the top to unclassified at the bottom. You could then add byways and bridleways and footpaths to this list but let's not do that for now. International standards such as GDF also have road classes. Their top one is called 'main road' and then classes 1-9 in descending order. In GDF these are called 'National Road Class' to keep the naming of these levels open for local interpretation. The important thing is that main road is the most important and class 9 is the least important. Lets refer to the top class as 0 (rather than main road). As you know in the UK these classes are currently encoded using the UK road classification systems for historical reasons. A problem for the USA and other countries is that the rendering of these roads is also currently based only on UK practice, so the most important roads (class 0) are blue, whereas in the US they should be orange. The next level down is rendered by OSM as green whereas for the US it should be yellow etc. I notice from current San Francisco mapping that a number of roads a tagged as 'secondary' which then renders as a comfortable orange colour which probably makes the US maps look better to local eyes even though in the class system this is a class 3 road. It seems important therefore to render roads appropriately in each country. For the UAS I think we need Mapnik and osmarender to render class 0 roads (tagged as motorways in OSM) as orange in the USA and blue in the UK and possibly other colours on a national basis. Class 1 roads (tagged as trunk) also as orange? Then class 2 (tagged as primary) and Class 3 (tagged as secondary) as yellow. Other classes could be white. Whatever the choice I think we need a table to relate road class (0-9) to the names various countries to colours in various countries. Does that make sense? If we don't do this then mappers will be tempted to tag to get the right visual appearance, rather than the rather classification. Regards, Peter _____ From: Karl Newman [mailto:[EMAIL PROTECTED] Sent: 14 April 2008 16:09 To: Peter Miller Cc: SteveC; Talk Openstreetmap; [EMAIL PROTECTED] Subject: Re: [OSM-talk] virtual san francisco mapping party? On Mon, Apr 14, 2008 at 4:03 AM, Peter Miller <[EMAIL PROTECTED]> wrote: <snip> I have a few specific questions/observations based on the work I have done so far. 1) The rail network data in the area seems very fragmentary. It may be valuable for someone with good local knowledge to concentrate on that bit. Welcome to public transit in the Bay Area. The real system is very fragmentary with poor coverage... 2) I have cleaned up and completed the BART network. I have tagged it 'subway' which may not be ideal, possibly 'metro' would be better. I am also not clear if it shares track with Union Pacific through Oakland down to Hayward. Also, if I say the subway is in a tunnel it is not rendered at all in Osmarender. Currently it is tagged with layer=-1 without a tunnel tag for the underground bits. Feel free to improve what I have done. I agree, "metro" or equivalent would be better. It's really only a subway in downtown Oakland and SF, and obviously in the trans-bay tube. I'm nearly 100% positive that it doesn't share track with UP. I think it has its own gauge and everything. <snip> 4) Nearly all the tiger roads are tagged as 'residential' by default. It would be very useful to have a mapping of terminology between US names 'interstate' etc, and the OSM ones. I assume 'motorway' = 'interstate'. How should 'trunk' be interpreted for the USA? What about Primary, secondary etc?. I suggest that you folk update the map features with your recommendations and ensure consistency across the USA. There has been a bit of discussion about this, but there doesn't seem to be any agreement and the Wiki is a mess with regards to this, with conflicting information on various pages. Part of the problem comes from us poor US residents trying to map our road system to the UK/European standard where many of us have not spent a lot of time (or in my case, I didn't pay attention to the road classifications). I would say in general, interstate=motorway, US highway=trunk or primary (or maybe motorway in certain cases), state highway=primary or secondary, county highway=secondary or tertiary, road through commercial district=unclassified, and residential=residential :-) Karl
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