A presentation about the approach chosen to represent geographic coordinates for maps and geographic entities in the data from the Deutsche Nationalbibliothek (German National Library, DNB). The presentation is part of the programme of the W3C workshop on Linking Geospatial Data (http://www.w3.org/2014/03/lgd/).

1. Lars G. Svensson
Enriching the German National
Library’s Linked Data Service with
Geographic Coordinates : Approach
and Lessons Learned (so far)
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| Geographic Coordinates in DNB Data : Linking Geospatial Data | March 5, 2014

2. The DNB has started to publish
geospatial data
Point
coordinates
and bounding
boxes
Titles (27 mill.)
Maps &
Charts
(20,000)
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Authorities (10
mill.)
Geographic
entities
(40,000 with
coordinates)
Currently only
Point
coordinates
| Geographic Coordinates in DNB Data : Linking Geospatial Data | March 5, 2014

3. The links between titles and places
allows you to find publications
dealing with a specific location
3

4. – We wanted to use the
same vocabulary for all
entity types (maps and
places) and for all
coordinate types (points
and polygons)
– The vocabulary should be
widely deployed and allow
the customers to do
interesting stuff with the
data
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| Geographic Coordinates in DNB Data : Linking Geospatial Data | March 5, 2014
Map by OpenStreetMap (CC BY-SA)
For the RDF representation we had
two major requirements

5. We decided to use geosparql with
simple features, but they are not
easy for laymen to use correctly…
5
<http://d-nb.info/1037321472> a bibo:Map , bibo:Document ;
bibo:isbn13 "9783869874982" ;
dcterms:isPartOf <http://d-nb.info/551113464> ;
isbd:P1053 "1 Kt." ;
dcterms:spatial [
a sf:Polygon ;
geo:asWKT "Polygon ((
+009.766666 +054.866666,
+009.766666 +054.183333,
+011.433333 +054.183333,
+011.433333 +054.866666,
+009.766666 +054.866666
))"^^geo:wktLiteral .
];
dcterms:subject <http://d-nb.info/gnd/4030486-3> ,
<http://d-nb.info/gnd/4179589-1> ;
dcterms:issued "2013" ;
dc:title "[Deutsche Seekarte]" ;
rda:otherTitleInformation "30. INT 1353. Ostsee.
Deutsche und dänische Küste. Kieler Bucht" .

6. It‘s easy to find out more:
General information about the DNB linked data service:
http://www.dnb.de/EN/lds
Or just send us a question:
j.hauser@dnb.de
datendienste@dnb.de
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| Geographic Coordinates in DNB Data : Linking Geospatial Data | March 5, 2014