This document discusses using OpenRefine to clean up crime data from Ljubljana, Slovenia to allow for comparisons across city quarters rather than just cadastral municipalities. It notes that Ljubljana is divided into 17 city quarters but crime data only identifies the larger cadastral municipalities, with some covering multiple city quarters. OpenRefine is used to replace references to cadastral municipalities with city quarters through a simple formula, allowing analysis of crime statistics at the desired city quarter level.

1. Lightning Round:
I <3 OpenRefine
Anuška Delić,
journalist at Delo and DeloData Project Leader

2. Fužine is (not) a ghetto

3. Objective & Problem
The objective is simple:
To compare crime statistics across Ljubljana’s City Quarters
The problem is complicated:
1. Ljubljana is a mess
2. Crime location data does not include City Quarters, only
Cadastral Municipalities

5. Some Facts
• the Municipality of Ljubljana is spread over 164 km2
• it is divided into 17 City Quarters
• its territory is divided into 57 Cadastral Municipalities
• borders of 39 Cadastral Municipalities are the same as borders of
City Quarters, i.e. 1 cadastral municipality falls into 1 city quarter
• borders of 18 Cadastral Municipalities are spread over 2 to 4
different City Quarters

6. Open Refine to The Rescue
one simple formula:
value.replace(“cadastral municipality”, “city quarter”)
+
many long hours and curse words
=
happy data journalist who gets to “reprimand” the police, too

7. Text Facet: cadaster

8. Mass Replace

9. Text Facet: streets

10. Numeric Facet: numbers

11. Fužine is (not) a ghetto

12. Hvala!
Thank you!