| 6 | Geographic Coordinates in DNB Data : Linking Geospatial Data | March 5, 20141

Enriching the German National Library’s Linked Data Service with Geographic Coordinates : Approach and Lessons Learned (so far)

Lars G. Svensson

The DNB has started to publish geospatial data

| 6 | Geographic Coordinates in DNB Data : Linking Geospatial Data | March 5, 20142

Titles (27 mill.)

Maps & Charts

(20,000)

Authorities (10 mill.)

Geographic entities

(40,000 with coordinates)

Currently only Point

coordinates

Point coordinates

and bounding boxes

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

3

For the RDF representation we had two major requirements

– 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

| 6 | Geographic Coordinates in DNB Data : Linking Geospatial Data | March 5, 20144

Map

by O

pen

Str

eetM

ap

(C

C B

Y-S

A)

We decided to use geosparql with simple features, but they are not easy for laymen to use correctly…<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" .5

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

| 6 | Geographic Coordinates in DNB Data : Linking Geospatial Data | March 5, 20146