an exploratory analysis of subject metadata in the digital public library of america dublin core...
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An Exploratory Analysis of Subject Metadata in the Digital Public Library of
America
Dublin Core International ConferenceWednesday, September 2, 2015São Paulo, Brazil
DPLA
Content Hubs
• ARTstor• Biodiversity Heritage Library• David Rumsey• Harvard Library• HathiTrust• Internet Archive• J. Paul Getty Trust• National Archives and
Records Administration
• Smithsonian Institute• New York Public Library• United States Government
Publishing Office• University of Illinois at
Urbana-Champaign• University of Southern
California Libraries• University of Virginia Library
Hub
DPLA
Hub
Service Hubs
• Digital Commonwealth• Digital Library of Georgia• Kentucky Digital Library•Minnesota Digital Library•Missouri Hub
•Mountain West Digital Library• North Carolina Digital
Heritage Center• South Carolina Digital
Library• The Portal to Texas History
February 2015:23 hubs8,012,390 metadata records
Number of Records/Items
ARTstor
Biodiversi
ty Herit
age Library
David Rumse
y
Harvard Li
brary
HathiTrust
Internet Arch
ive
J. Paul G
etty Trust
National Arch
ives a
nd Records A
dministration
Smithso
nian Insti
tution
The New York
Public Li
brary
United States G
overnment P
ublishing O
ffice
Universi
ty of Il
linois
at Urbana-Champaign
Universi
ty of S
outhern California Li
braries
Universi
ty of V
irginia Li
brary
Digital C
ommonwealth
Digital L
ibrary of G
eorgia
Kentucky Digita
l Library
Minnesota Digita
l Library
Missouri H
ub
Mountain West
Digital L
ibrary
North Carolin
a Digital H
eritage Center
South Carolina Digita
l Library
The Portal to
Texas H
istory
10,000
100,000
1,000,000
10,000,000
Content Hubs Service Hubs
Why subjects?
Average Number of Subjects Per Record
ARTstor
Biodiversi
ty Herit
age Library
David Rumse
y
Harvard Li
brary
HathiTrust
Internet Arch
ive
J. Paul G
etty Trust
National Arch
ives a
nd Records A
dministration
Smithso
nian Insti
tution
The New York
Public Li
brary
United States G
overnment P
ublishing O
ffice
Universi
ty of Il
linois
at Urbana-Champaign
Universi
ty of S
outhern California Li
braries
Universi
ty of V
irginia Li
brary
Digital C
ommonwealth
Digital L
ibrary of G
eorgia
Kentucky Digita
l Library
Minnesota Digita
l Library
Missouri H
ub
Mountain West
Digital L
ibrary
North Carolin
a Digital H
eritage Center
South Carolina Digita
l Library
The Portal to
Texas H
istory
0
2
4
6
8
10
12
Content Hubs Service Hubs
Maximum Number of Subjects in Any Record
ARTstor
Biodiversi
ty Herit
age Library
David Rumse
y
Harvard Li
brary
HathiTrust
Internet Arch
ive
J. Paul G
etty Trust
National Arch
ives a
nd Records A
dministration
Smithso
nian Insti
tution
The New York
Public Li
brary
United States G
overnment P
ublishing O
ffice
Universi
ty of Il
linois
at Urbana-Champaign
Universi
ty of S
outhern California Li
braries
Universi
ty of V
irginia Li
brary
Digital C
ommonwealth
Digital L
ibrary of G
eorgia
Kentucky Digita
l Library
Minnesota Digita
l Library
Missouri H
ub
Mountain West
Digital L
ibrary
North Carolin
a Digital H
eritage Center
South Carolina Digita
l Library
The Portal to
Texas H
istory
1
10
100
1000
10000
Content Hubs Service Hubs
Records Subjects0
2000000
4000000
6000000
8000000
10000000
12000000
14000000
Content Hubs Service Hubs
Total Number of Records and Subjects by Hub Type
Number of Records with No Subjects
ARTstor
Biodiversi
ty Herit
age Library
David Rumse
y
Harvard Li
brary
HathiTrust
Internet Arch
ive
J. Paul G
etty Trust
National Arch
ives a
nd Records A
dministration
Smithso
nian Insti
tution
The New York
Public Li
brary
United States G
overnment P
ublishing O
ffice
Universi
ty of Il
linois
at Urbana-Champaign
Universi
ty of S
outhern California Li
braries
Universi
ty of V
irginia Li
brary
Digital C
ommonwealth
Digital L
ibrary of G
eorgia
Kentucky Digita
l Library
Minnesota Digita
l Library
Missouri H
ub
Mountain West
Digital L
ibrary
North Carolin
a Digital H
eritage Center
South Carolina Digita
l Library
The Portal to
Texas H
istory
1
10
100
1,000
10,000
100,000
1,000,000
Content Hubs Service Hubs
Percentage of a Hub’s Records Containing Zero Subjects
ARTstor
Biodiversi
ty Herit
age Library
David Rumse
y
Harvard Li
brary
HathiTrust
Internet Arch
ive
J. Paul G
etty Trust
National Arch
ives a
nd Records A
dministration
Smithso
nian Insti
tution
The New York
Public Li
brary
United States G
overnment P
ublishing O
ffice
Universi
ty of Il
linois
at Urbana-Champaign
Universi
ty of S
outhern California Li
braries
Universi
ty of V
irginia Li
brary
Digital C
ommonwealth
Digital L
ibrary of G
eorgia
Kentucky Digita
l Library
Minnesota Digita
l Library
Missouri H
ub
Mountain West
Digital L
ibrary
North Carolin
a Digital H
eritage Center
South Carolina Digita
l Library
The Portal to
Texas H
istory
0
10
20
30
40
50
60
70
80
90
100
Content Hubs Service Hubs
Number of Total Subjects and Unique Subjects
ARTstor
Biodiversi
ty Herit
age Library
David Rumse
y
Harvard Li
brary
HathiTrust
Internet Arch
ive
J. Paul G
etty Trust
National Arch
ives a
nd Records A
dministration
Smithso
nian Insti
tution
The New York
Public Li
brary
United States G
overnment P
ublishing O
ffice
Universi
ty of Il
linois
at Urbana-Champaign
Universi
ty of S
outhern California Li
braries
Universi
ty of V
irginia Li
brary
Digital C
ommonwealth
Digital L
ibrary of G
eorgia
Kentucky Digita
l Library
Minnesota Digita
l Library
Missouri H
ub
Mountain West
Digital L
ibrary
North Carolin
a Digital H
eritage Center
South Carolina Digita
l Library
The Portal to
Texas H
istory
100
1,000
10,000
100,000
1,000,000
10,000,000
Content Hubs Service Hubs
1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 220
200,000
400,000
600,000
800,000
1,000,000
1,200,000
1,400,000
1,600,000
1,800,000
Number of Hubs Sharing Unique Subjects
Num
ber o
f Uni
que
Subj
ects
1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 221
10
100
1,000
10,000
100,000
1,000,000
10,000,000N
umbe
r of U
niqu
e Su
bjec
ts
Number of Hubs Sharing Unique Subjects
African Americans
ChildrenAnimals
Architecture
Transportation
Horses
Education
So what?
Questions?
Hannah [email protected]
Mark [email protected]
Oksana [email protected]
Priya [email protected]