oops... didn't realize this didn't go to the list :)
---------- Forwarded message ----------
From: Pablo N. Mendes <[email protected]>
Date: Wed, Jul 25, 2012 at 4:17 PM
Subject: Re: [Dbpedia-discussion] Data Points in Australia coast
To: jordi castells <[email protected]>
Hi Jordi,
While the other guys are busy with the 3.8 release, I can give you a couple
of initial pointers:
By looking at the source page, I found out which infoboxes are used.
http://en.wikipedia.org/w/index.php?title=Australia&action=edit
For example, Infobox country:
http://en.wikipedia.org/w/index.php?title=Template:Infobox_country
By simple string substitution in the URL, I arrived at the mapping in our
mappings server:
http://mappings.dbpedia.org/index.php?title=Mapping_en:Infobox_country&action=edit
Which contains a specialized Geocordinates mapping:
{{GeocoordinatesMapping | latitudeDegrees = latd | latitudeMinutes = latm
| latitudeDirection = latNS | longitudeDegrees = longd |
longitudeMinutes = longm | longitudeDirection = longEW }}
}}
You can take a look at the extractors:
http://dbpedia.hg.sourceforge.net/hgweb/dbpedia/extraction_framework/file/e4cb1874298e/core/src/main/scala/org/dbpedia/extraction/mappings/GeoCoordinatesMapping.scala
http://dbpedia.hg.sourceforge.net/hgweb/dbpedia/extraction_framework/file/e4cb1874298e/core/src/main/scala/org/dbpedia/extraction/mappings/GeoExtractor.scala
I also found another template at the Australia page:
http://en.wikipedia.org/wiki/Template:Coord
But I don't know what is the reason for the duplication. Let's see if
somebody else that knows more about the core can help. Or perhaps now with
this info you can arrive at the answer yourself.
If you find a fix, we'd love to get a patch!
Cheers,
Pablo
On Wed, Jul 25, 2012 at 3:35 PM, jordi castells <[email protected]>wrote:
> 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
>
>
>
--
---
Pablo N. Mendes
http://pablomendes.com
Events: http://wole2012.eurecom.fr (*Deadline: July 31st 2012*)
--
---
Pablo N. Mendes
http://pablomendes.com
Events: http://wole2012.eurecom.fr (*Deadline: July 31st 2012*)
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