Hi,
If I understand your problem correctly, you want to get an ordered list
of single intersections along a street. IMO you should first get the
list of all intersections, with their order, x,y, to_street and
from_street items. Then, apply a filter which could work either way :
- delete consecutive intersections involving the same streets
- delete identical intersections within a buffer
or maybe even both ways together.
Hope that helps
Regards,
Guillaume
Michal Migurski a écrit :
> Hi,
>
> This is a geometry question.
>
> I'm working on a personal project using OpenStreetMap data that requires
> a cross street index, that is, an ordered list of every intersection
> along a street. I have it working fairly well, but I'm running into a
> wall with dual carriageways. Here's an example from Oakland:
>
>
> http://www.openstreetmap.org/?lat=37.80892&lon=-122.28339&zoom=17&layers=B000FTF
>
>
> 14th Street crosses Adeline, Chestnut, Linden, Filbert, Myrtle, and
> Market, but it does so twice and in two different directions. I've
> gotten to a point where I'm able to extract a bundle of linestrings that
> represent a length of road between two major intersections, e.g. 14 St
> between Myrtle and Market, but I'm having difficulty detecting and
> correcting the potential presence of two overlapping carriageways. I'm
> hoping to have something that can deal with regular single-carriageway
> streets, this example of 14th St. in Oakland, places where a single
> carriageway splits into two (e.g. to the west, where 14th crosses
> Kirkham), and so on.
>
> I'm working in Python, with PostGIS and Shapely.
>
> I *think* what I'm aiming for is a near-parallel line detector, so I'm
> experimenting with normalizing road orientation to zero and projecting
> onto a straight line. It's getting squirrelly and I'm hoping someone can
> help point to an existing approach to this problem.
>
> I'm open to the idea that there may be some manual intervention needed.
>
> -mike.
>
> ----------------------------------------------------------------
> michal migurski- [email protected]
> 415.558.1610
>
>
>
>
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