[Talk-GB] LEZ get this completed?

2014-10-15 Thread Antje (OpenStreetMap)
Hi,

I wonder if someone could help me complete this LEZ thing in London? I’ve only 
been able to add the boundaries from what I actually saw, but progress is 
incredibly slow. If an import is necessary, it has to be ODbL-okayed.
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Re: [Talk-GB] LEZ get this completed?

2014-10-15 Thread Dan S
Hi Antje,

So you're talking about this?
http://wiki.openstreetmap.org/wiki/LEZ#UK

Looking at the relation we've got so far, I don't really see how we
discover the border. I imagine in practice we'll see You are now
entering the LEZ signs, so how do you manage to turn those into the
(dis)continuous boundary lines that we've got so far?

Thanks
Dan


2014-10-15 8:39 GMT+01:00 Antje (OpenStreetMap) kurias...@gmail.com:
 Hi,

 I wonder if someone could help me complete this LEZ thing in London? I’ve 
 only been able to add the boundaries from what I actually saw, but progress 
 is incredibly slow. If an import is necessary, it has to be ODbL-okayed.
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Re: [Talk-GB] LEZ get this completed?

2014-10-15 Thread Antje (OpenStreetMap)
I live in London, so I could figure out a small part of the boundary based on 
the fact that it doesn’t go outside London for obvious reasons, and on the 
basis of a number of past surveys and personal memory (which I call leftovers).

Do you think you want to change this relation to be node-based? I’m only going 
by what the Germans do for their LEZs.
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Re: [Talk-GB] LEZ get this completed?

2014-10-15 Thread Dan S
2014-10-15 9:17 GMT+01:00 Antje (OpenStreetMap) kurias...@gmail.com:
 I live in London, so I could figure out a small part of the boundary based on 
 the fact that it doesn’t go outside London for obvious reasons, and on the 
 basis of a number of past surveys and personal memory (which I call 
 leftovers).

 Do you think you want to change this relation to be node-based? I’m only 
 going by what the Germans do for their LEZs.


I don't have a strong opinion, just trying to understand how I would
map it if I saw it in surveying.

Dan

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Re: [Talk-GB] LEZ get this completed?

2014-10-15 Thread Philip Barnes
On Wed, 2014-10-15 at 09:17 +0100, Antje (OpenStreetMap) wrote:
 I live in London, so I could figure out a small part of the boundary based on 
 the fact that it doesn’t go outside London for obvious reasons, and on the 
 basis of a number of past surveys and personal memory (which I call 
 leftovers).
 
 Do you think you want to change this relation to be node-based? I’m only 
 going by what the Germans do for their LEZs.

Doing the same as the Germans does make sense, they have far more
experience in this case. 

In reality there is no boundary, there are a series of entry/exit nodes
on each road that can be joined, but any line will always be arbitrary.

Phil (trigpoint)



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Re: [Talk-GB] LEZ get this completed?

2014-10-15 Thread Antje (OpenStreetMap)
In my case, I have to consider the following:
- How the boundary will avoid approved turn-backs like the London Gateway 
services on the M1.
- How the boundary will avoid land that’s technically in the boundary but 
accessed by driveways that only enter from and exit into non- LEZ roads.

You are right that an LEZ boundary is arbitrary and this is why the TfL version 
is clearly wrong. OSM can try its best to be as respectful as possible but it’s 
a learning process.
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Re: [Talk-GB] LEZ get this completed?

2014-10-15 Thread Steve Doerr

On 15/10/2014 09:53, Philip Barnes wrote:

On Wed, 2014-10-15 at 09:17 +0100, Antje (OpenStreetMap) wrote:

I live in London, so I could figure out a small part of the boundary based on 
the fact that it doesn’t go outside London for obvious reasons, and on the 
basis of a number of past surveys and personal memory (which I call leftovers).

Do you think you want to change this relation to be node-based? I’m only going 
by what the Germans do for their LEZs.

Doing the same as the Germans does make sense, they have far more
experience in this case.

In reality there is no boundary, there are a series of entry/exit nodes
on each road that can be joined, but any line will always be arbitrary.




There are very detailed maps of the boundary on the TFL website, but of 
course they are Ordnance-Survey-based, so cannot be used. 
http://www.tfl.gov.uk/maps/low-emission-zone


--
Steve

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Re: [Talk-GB] LEZ get this completed?

2014-10-15 Thread Antje (OpenStreetMap)
Nah, I already ignore those: they include land that’s technically in the 
boundary but accessed by driveways that only enter from and exit into non- LEZ 
roads.
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