Re: [OSM-talk] Roundabouts and routing

[4x4falcon]

On 09/09/11 15:45, David Earl wrote:



On Friday, 9 September 2011, Nathan Edgars II mailto:nerou...@gmail.com>> wrote:
 > On 9/8/2011 3:45 PM, David Earl wrote:
 >>
 >> The problem is exacerbated because many of these were done as a single
 >> one way which comes off the roundabout and then turns almost 180 deg.
 >> and rejoins roundabout.
 >>
 >> Example:
 >> http://www.openstreetmap.org/browse/way/4565106

 >
 > This is certainly no good, since it implies that making that U-turn
is staying on the same road.


i didnt start the idiom of this apparent U turn, merely the tagging to
indicate what it is to programs. But the idiom is very widespread
AFAICS. But Im not sure that breaking it in two says anything different.

David


This mapping is incorrect they are two separate ways and should be 
mapped as such.


Cheers
Ross

___
talk mailing list
talk@openstreetmap.org
http://lists.openstreetmap.org/listinfo/talk

Re: [OSM-talk] Bing maps is misplaced

[4x4falcon]

On 08/12/10 08:32, Steve Bennett wrote:

On Wed, Dec 8, 2010 at 4:51 AM, Jo  wrote:

Jaak, do you know that you can change the offset in most editors? Potlatch2
and JOSM. I suppose in Merkaartor too, but I don't know for sure.


But how do you know which direction to offset and by how much? Is the
Bing imagery really offset so uniformly, over large areas?

Btw:

They are shifted about 20-25 meters, which makes them quite unusable

for tracing.anything more than big roads.



But if you have some gps traces in the area and/or some surveyed roads 
then it's possible to line up the imagery with the known surveyed items.


Area I'm working in at the moment generally appears to be 5-10 metres 
out.  From numerous gps traces and known positions.



Same as was done with Yahoo and some of the early nearmap imagery.

Cheers
Ross

___
talk mailing list
talk@openstreetmap.org
http://lists.openstreetmap.org/listinfo/talk