DJM Topic 1 - Introduction to Data Journalism Flashcards
Data Journalism
A journalistic process that involves analyzing and filtering large data sets to create or enhance news stories
Information visualization
The communication of information using graphical representations
Scientific visualization
Represents physical data like X-rays and MRI scans
John Snow’s cholera map
Used bars within houses to represent deceased individuals from cholera in London in 1663
Tokyo Underground map
A logical representation of the metro system highlighting qualitative relationships between stops
Dow Jones Industrial Average (DJIA)
A stock index based on the weighted average of stock prices of 30 large U.S. companies from 1900 to 2000
Human working memory limitation
Can only hold about 3 slots of information at a time
Data visualization process steps
Raw data –> data pre-processing –> visual mapping –> view transformations –> user interaction
2) Data pre-processing
Mapping data to fundamental types, handling missing values, extracting relevant data
3) Visual mapping
Choosing appropriate visual representation for data based on expressiveness and effectiveness
4) View transformations
Mapping visual representation to final presentation considering expressiveness and effectiveness
Pre-attentive processing
Visual properties perceived immediately without focused attention, important for visualization design
Pre-attentive visual attributes
Position, color, shape, size, motion
Gestalt principles of perception
Closure, proximity, similarity, continuity, figure-ground - how humans perceive and organize visual information
Visual variables
Position, mark, size, brightness, color, orientation, texture, motion - used to represent data in visualizations
