[Talk-us] administrative boundaries and Nominatim

Greg Troxel gdt at ir.bbn.com
Tue Jul 31 23:38:24 BST 2012


Serge Wroclawski <emacsen at gmail.com> writes:

> On Mon, Jul 30, 2012 at 8:25 AM, Metcalf, Calvin (DOT)
> <calvin.metcalf at state.ma.us> wrote:
>> So I'm somewhat confused about how nominatim actually works. A good example is the building I work in (10 park plaza Boston ma) the version of nominitum on the website gets the correct location on the first try (note mapquest has it as the 3rd result) but they have it as being
>
> Often what happens is that you have one of two problems, in this order:
>
> 1. Nodes
>
> 2. Incorrectly prominent areas
>
> Nodes are a major problem. In the case of a node area, Nominatim will
> attempt to guess at how large/prominent the area is. If it's a city,
> for example, it will be very lose about how far out it thinks the city
> borders are. Neighborhoods, same thing, and so you get these odd
> classifications.
>
> The solution to this is to replace nodes with polygons, period.

Is it sensible to have a polygon for the boundary and also a node that
locates precisely the cultural/logical center?  Does Nominatim ignore
the node when there is a same-named boundary?  Or is there some way to
have a relation for a town that has both a polygon and a center?
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