Hello
I have been working with dbpedia the last months, I also asked something
about the point values on the mailing list,
and you already gave me good advice on other semantic datasets to check.
I continued working with dbpedia because I want other information provided
about the Points datasets, relations, wikipedia abstracts etc.
But I would like to ask again the question on how the point values are
generated. Recently I plotted DBpedia points on a map:
http://i.imgur.com/lVVbQ.png
To determine the most populated zones. There are some errors, but I assume
that it's okay, it is impossible
not to have errors.
What worries me is the kind of duplication found on Australia:
http://i.imgur.com/fTAwb.png
For example, the N-triples for Melbourne lat,lon are the following:
---
<http://dbpedia.org/resource/Melbourne> <
http://www.w3.org/2003/01/geo/wgs84_pos#lat> "37.8136"^^<
http://www.w3.org/2001/XMLSchema#float> .
<http://dbpedia.org/resource/Melbourne> <
http://www.w3.org/2003/01/geo/wgs84_pos#lat> "-37.8136"^^<
http://www.w3.org/2001/XMLSchema#float> .
<http://dbpedia.org/resource/Melbourne> <
http://www.w3.org/2003/01/geo/wgs84_pos#long> "144.963"^^<
http://www.w3.org/2001/XMLSchema#float> .
---
Repeating the latitude with positive and negative values. making it
impossible for a machine to determine the correct place.
Other points have duplicated latitudes or longitudes, but those are so
close that it makes no big difference (like
http://dbpedia.org/page/Ben_Lomond,_California<http://dbpedia.org/page/Saratoga,_California>
).
This is why I write to the mailing list. To point out those errors, ask
again how the geo:lat, geo:lon predicates are populated, and to offer my
help if I can do something to improve it.
Salut!
*--Jordi Castells--*
http://jcastellssala.wordpress.com
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