Data visualization in data journalism workflow



Alessio Cimarelli


"Data visualization: the (beautiful) new frontier"
International Journalism Festival in Perugia 2014
#ijf14 - May Day, 2014

Who_ Datamediahub

The information about the media like you've never seen



DataMediaHub is a hub of professionals interested in the Italian media and journalism created to aggregate data on this subject and present it graphically and in an interactive in order to give a visual impact and to help the understanding of the phenomena recounted.

Who_ Dataninja

Data journalism & data visualization made in Italy



Dataninja is a collective. Founded in 2012 by Andrea Nelson Mauro (journalist) and Alessio Cimarelli (data scientist), it's a network of data journalists with the goal of telling stories from data analysis and visualization.

What_ Data journalism

Data or not, it is always the dear old journalism, baby

There was 5 exabytes of information created between the dawn of civilization through 2003, but that much information is now created every 2 days, and the pace is increasing
Google CEO Eric Schmidt, 2010

If journalism want to continue to tell the world and now a large part of the world is made up of digital data, journalists simply can't avoid having to deal with data.

Data journalism workflow

Four is the magic number


  1. Search
  2. Check and cleaning
  3. Analysis
  4. Story-telling

Data visualization can be an useful tool in all of these steps.

The nose eye for news

Step 1: search



The nose eye for news

Step 2: check and cleaning


  • How to find errors in type, sign, order of magnitude, ...?
    • A simple line chart for trends
    • A simple scatter plot for ordered values
    • A distribution (bar chart) of a set of numbers

  • How to find outliers or missing?
    • Not absolute values, but distances from the mean
    • Setting a threshold
    • Even a distribution

The nose eye for news

Step 3: analysis


  • Basic charts (scatter, lines, bars, ...) to see and not to read

The nose eye for news

Step 4: story-telling

When design matters


Where_ Mapping data

Four examples of geographic data viz


From datamediahub.it

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Alessio Cimarelli
jenkin@dataninja.it
Stay in touch!
And tomorrow...
  • "Hackathon: maratona tra codice, notizie e dati"
    At 9:30 in the Hotel La Rosetta | #hackijf14

Data visualization in data journalism workflow

By Dataninja srls

Data visualization in data journalism workflow

Talk within the panel "Data visualization: the (beautiful) new frontier" during the International Journalism Festival in Perugia #ijf14 - 01/05/2014

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