I gratefully acknowledge that I live and work, and play on the unceded, traditional territories of the Coast Salish peoples - sḵwx̱wú7mesh (Squamish), sel̓íl̓witulh (Tsleil-Waututh), and xʷməθkʷəy̓əm (Musqueam) nations.
In this MultiMedia Book Report, I share a little of what I’ve learned about "Data Visualization" and include my favourite online open source tools and examples.
1- What is Data Visualization? 2- Brief History of Data Visualization 3- Tiki-toki Visual Timeline 4- Interactive Data Visualization Examples a-The Global Flow of People -Animated Graph b-worldshapin- Interactive Changeable Graph c-NYC Street Trees - Interactive Infographic d- Hollywood Insider -Interactive Graph 5- Introduction of Tableau 6- Demonstration of Tableau with data 7- Infographic Demonstration
What is Data Visualization? When you search for "definition of data visualization", you will find definitions from a scientific, historical, commercial or marketing perspective. The definitions have similar wording.
Instead of choosing one definition, I will use a visualization tool, the "Word Clouds Generator" tool, designed by Jason Davies. This open source data visualization tooI is used on websites and blogs to depict keyword or tag usage. The tool can also be used to compare two different bodies of text.
First, I gathered ten definitions of “data visualization” from various online sources. Then I copied all ten definitions and pasted them into the text body box of "Word Clouds Generator." Words appear in a given body of text, by making the size of each word proportional to its frequency.
As the demonstration video on the next page illustrates, the bigger words are those used more frequently. I then minimized the numbers of words using the Word Clouds Generator, reduced the words from 250 to 20 to see the words that appear in all definitions. The most frequent words were: "visualization," "data," "representation," "images," "system," "communication," and "graphic."
The words used most frequently were used to build my own definition:
"Data visualization is the presentation of data in picture or graphic which maps information visually in the system."
The applied art of data visualization has been around for a very long time. In the 18th century, William Playfair invented the forms we use so frequently today. He created the line chart, bar chart, pie chart, and circle chart.
During the 19th century, one of the best examples of data visualization is John Snow’s chart mapping an 1854 cholera outbreak.
John Snow's map of cholera outbreaks from nineteenth century London changed how we see disease, and is considered as one of the most inspirational examples of data journalism. In the 1850s, cholera was believed to be spread by miasma in the air and the sudden and serious outbreak of cholera in London's Soho was a mystery. His map essentially represented each death as a bar which you can see in the video on the right. It became apparent that the cases were clustered around the pump on Broad street, which was polluted by sewage from a nearby cesspit.
In 1812, Charles Joseph Minard mapped Napoleon's march to Russia, representing the journey on a graph with different features such as temperature and number of soldiers remaining in each place.