[Imports] Address import for Biella

[Andrea Musuruane]

Hi Rafael,

On Fri, Nov 21, 2014 at 3:51 PM, Rafael Avila Coya <ravilacoya at gmail.com>
wrote:

> Hi, Andrea:
>
> Thank you for your dedication to this interesting address data import.
>
> I have opened the already merged osm file [1].
>
> I think the quality of the data is really good in general in what
> respects to the location of the nodes, although some of them seem to lie
> over the road they belong too [2]. I don't see that a big concern, as
> they are quite rare, and moreover this could be due to a not well
> aligned Bing imagery.
>

In Italy we tend to use PCN aerial images not Bing because they are usually
better aligned:
https://wiki.openstreetmap.org/wiki/WikiProject_Italy/PCN

Anyway I agree that that particular node is not well aligned.


> But what I see a serious concern is the big number of groups of
> addresses of the kind 4, 4a, 4b, 4c...
>
> Let's see, as an example, this image in Via Giovanni Crestani: [3]
>
> There we can see one building with the addr:housenumber=4 on it, but
> then a row of 17 addr:housenumber that range from 4a up to 4t, that are
> surrounding the house, some of them stretching quite far from it, nearer
> to the house 6 and 19 than to the 4.
>
> The same happens with numbers 6, 17, 19, 21 and 30 in this example only.
> Moreover, node number 8 doesn't exist in the group of 9 nodes that go
> from 8a up to 8i.
>
> My opinion is that these nodes should be replaced by only one. In the
> case of the groups of 4, 6, 17, 21 and 30 I would ignore (not import)
> all the nodes with letter, so keeping only the node addr:housenumber=4 ,
> 6, etc., and in the cases like the 8, I would create a new
> addr:housenumber=8 as the centroid of the nodes 8a, 8b... 8i.
>
> This is a quick idea, but there may be smarter ones to deal with this.
>
> What do you think?
>

I think it is plain wrong to delete subordinates.

In most of Italy, and in Biella, a housenumber is not associated to a
building. It is associated to an entrance (building entrances, gates,
garages, etc). A housenumber can also have a subordinate (the letters you
see). A user is expected to search for a housenumber like "36d" and not for
"36" which can be 2 km down the road.
https://wiki.openstreetmap.org/wiki/Import/Catalogue/Address_import_for_Biella#Address_format_in_Biella

Bye,

Andrea
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