[OSM-talk] Map Features List

[David Earl]

On 11/12/2007 18:59, David James wrote:
> On Tue, December 11, 2007 5:46 pm, Chris Hill wrote:
> 
>> OK I'll leave them alone - that's why I asked.
>>
>>
>> I'm keen to see why abutters is useful:
>> How do you know which side of a way it applies to?
> 
> I've been wondering that too. I've a vague feeling that I've seen a
> suggestion somewhere of using abutters:left and abutters:right, but that
> could be a figment of my imagination.

Yes that was proposed. But it doesn't really solve much.

> I have a real-life example that I'm unsure how to tag where one side of
> the street is residential and the other side is open fields, there must be
> lots of cases like this.

Yes. That's why I've used it as an indicator of the kind of road it is, 
not an indication that it specifically has houses along both sides on 
all its length. The case I'm particularly thinking of is a residential 
street that needs to be marked as tertiary, secondary etc, where if it 
didn't have a designation it would be highway=residential. So 
highway=secondary; abutters=residential is just a residential street 
with higher designation. Whether it actually has houses both sides is 
immaterial IMO, but it is also why rendering it as if with houses 
alongside is problematic.

> The problem I have with landuse is that (as I read things) landuse tags an
> area rather than a way, and I often don't know how deep the residential
> area is perpendicular to the road.

abutters doesn't solve this problem either.

>> How do you know the extent of the type beyond the way?
>> Does it get rendered?
> 
> I think an earlier reply said it doesn't.

Correct, it doesn't on Mapnik or Osmarender.

It did on both until a few months ago.

> It seems to me that at low zooms, residential areas get a grey shading.
> Where does this come from? Is it coming from the existence of highways
> which are residential? or abutters=residential, or is it just my eyesight
> playing tricks because there are lots of ways packed close together ion
> the rendered map?

Some urban areas have landuse. For others it's just density.

David