1

Data Identification

2

Open Data Around the World

3

Before

What data do you have?

Have to ask for data through a FIOA request

Wasn't always in a digital format

Very long time to get and make use of

4

Why Should I care?

Health (hospital scores, diet/food)

Economics (unemployment, CPI)

Crime (rates, geo/temporal)

Environment (air quality, weather)

Education (rates, school districts)

So much more....

5

Data.gov

6

Raw Data

7

Data.gov Dataset Page

8

Other Raw Datasets

9

Challenges

Machine-readability

Metadata

Provenance

Discovery

Mashing/linking

10Linked Data

decentralized - sources may be spread out and referenced across the Web

modular - linked without advance planning or coordination

scalable - once stored in place, it’s easy to extend

advantages hold even when definitions and structure of the data changes over time.

11Linked Open Data Cloud

12

13Linking Open Government Data

14Catalog

15Dataset Page

16

Data Understaing

17Conversion:

From Raw Tabular Data to RDF

18Enhancement:

Linking Open Government Data

ID year PHSY_ST site-id cost

1998 10.0

1999 site123 11.3

2000 NY 8.3

2001 20

site-id Latitude longitude

site123 43.993 -70.326

Year claims

2000 382

PHSY_ST: state abbreviationID: unique id

cost: unit is million US dollarsyear: 1975-2008

Correlated dataset Complement dataset

Metadata (field definition) Metadata (value definition)

owl:sameAs

DS123:NY