didn't know this page exists. Fully agreed this is the best way to do. It's not perfect and some deviations will make sense here and there.
On 4 Mar 2010, at 15:37 , Kevin Samples wrote: > Hi, > I am a proponent of using the Highway Functional Classification System, > which Alan has described below and is on the wiki.... > http://wiki.openstreetmap.org/wiki/Highway_Functional_Classification_System > > I've classified roads in Clarke County, Georgia and the surrounding > counties using the HFC System with what I think are good results. > http://osm.org/go/ZSCaTrq > > Kevin > > On 3/4/2010 6:12 PM, Alan Mintz wrote: >> At 2010-03-04 09:38, McGuire, Matthew wrote: >> >>> ... >>> A road's Observed Character is what kind of road it appears to be to a >>> person on the road. For general purpose maps, using observed character to >>> classify the roads intends to match a person expectations to what they see >>> on the ground. Character is highly correlated with function, but is not >>> the same. >>> >>> I think Observed Character is what OSM is trying to achieve with the >>> highway tag. I think this because the OSM tag descriptions for highways >>> have photos and describe how the road looks, and you cannot determine >>> system or function from a photograph. I also think it is what the Census >>> Feature Class Code definitions describe. >>> >> I disagree. Even if this is what was intended, it's certainly less useful >> than the others. When I zoom out a certain amount, what I want to see is >> the local (aka residential in OSM) roads disappear. Further out still, I >> want to see the tertiary roads disappear, etc. This is what's useful when >> trying to map a route through an unknown area - you want to stick to the >> main roads that get you there with better road conditions, fewer >> intersections, etc. >> >> As an example, in this area: >> http://www.openstreetmap.org/?lat=34.426&lon=-117.664&zoom=11&layers=B000FTF >> , 2-land paved roads are few and far between, making them important >> tertiary or secondary connections. A road with the same characteristics in >> the city would be unclassified, as there are much better roads. It's all >> relative to the area, which is why I don't think it's reasonable to >> classify by any objective characteristics - you have to know or survey the >> area in order to know how to classify them. Perhaps some people with a lot >> of experience may be able to do this from satellite imagery. >> >> I believe this closely matches what I see in transportation sections of a >> city's general plan. I think it's useful to use these as guidelines when >> classifying roads. Many cities/counties of any reasonable size make these >> available on their website. They usually have: >> >> - freeway, expressway, etc. = OSM motorway or trunk >> - primary arterial = OSM primary >> - secondary arterial = OSM secondary >> - minor arterial and/or collector = OSM tertiary >> - local = OSM residential or unclassified >> >> -- >> Alan Mintz<alan_mintz+...@earthlink.net> >> >> >> _______________________________________________ >> Talk-us mailing list >> Talk-us@openstreetmap.org >> http://lists.openstreetmap.org/listinfo/talk-us >> >> >> > > _______________________________________________ > Talk-us mailing list > Talk-us@openstreetmap.org > http://lists.openstreetmap.org/listinfo/talk-us _______________________________________________ Talk-us mailing list Talk-us@openstreetmap.org http://lists.openstreetmap.org/listinfo/talk-us
