LGD seems to contain only a few of all housenumber in OSM. How can it be?

[Francesco Fagnoni]

Hi,

first of all I have to  thank all the people that believe in the LinkedData era and are participating to its development.

I have some question regarding the retrieval of the house numbers from the LGD's sparql endpoint:

If I run a query to select all the buildings which have 

• a  house number indicated 
• and are located in the city of, for example, of Esino Lario

like the following one:

Select *

Where {

?s

    <http://linkedgeodata.org/ontology/addr%3Acity> "Esino Lario";

    <http://linkedgeodata.org/ontology/addr%3Ahousenumber> ?housenumber.

}

I get only 2 results whereas in OSM seems that a lot of building have explicitly indicated a housenumber (see this link for comparison).

Even if i expand my search to the whole world broadening at the maximum the research

Select count(?housenumber ) as ?n
Where { ?s  <http://linkedgeodata.org/ontology/addr%3Ahousenumber> ?housenumber }

I get only 1,176,404 results which seems not reasonable at all.

Seems that the LGD database is not complete or not updated at Jan 2016 as declared. Or, which is more plausible, I am doing some bad mistakes in the query.

Can somebody please help me go trough this mystery?

Many thanks,

Francesco

 

 

[Claus Stadler]

Hi,

So far the LGD dumps do not explicitly contain the Building class: http://downloads.linkedgeodata.org/releases/2015-11-02/
The 1.861.454 buildings that exist in the current datasets have an additional type that was part of the dump.

http://linkedgeodata.org/sparql?default-graph-uri=http%3A%2F%2Flinkedgeodata.org&qtxt=select+count%28*%29+{+%3Fs+a+%3Chttp%3A%2F%2Flinkedgeodata.org%2Fontology%2FBuilding%3E+}&format=text%2Fhtml&timeout=0&debug=on

There is an older full dump from 2013 http://downloads.linkedgeodata.org/full-dumps/
but due to its size (121GB bz2 / some TB uncompressed) I suppose its hardly of use.

I'll see that I create an extra buildings dump.

Best regards,
Claus

--
You received this message because you are subscribed to the Google Groups "Linked Geo Data" group.
To unsubscribe from this group and stop receiving emails from it, send an email to linked-geo-da...@googlegroups.com.
To post to this group, send email to linked-...@googlegroups.com.
Visit this group at https://groups.google.com/group/linked-geo-data.
For more options, visit https://groups.google.com/d/optout.

-- 
Dipl. Inf. Claus Stadler
Department of Computer Science, University of Leipzig
Research Group: http://aksw.org/
Workpage & WebID: http://aksw.org/ClausStadler
Phone: +49 341 97-32260