SPL Checkout Transactions by Hour of Day
I wanted to visualize all checkout transactions at the Seattle Public Library (SPL) on a particular day. I started with a 2D visualization, where number of transactions, represented by the darkness of the blue boxes, is mapped against the hours of the day. Height and color of the boxes indicates the number of transactions for that hour and Dewey category on a particular day.
SPL Checkouts vs NYT Articles
The second graph looks for connections between the Great Recession and the Greek government-debt crisis in the checkout patterns of titles at the SPL and New York Times article titles. White dots represent NYT articles containing "Greece," while black dots represent SPL checkouts related to "Real Estate." Both vertical position of dots and their size are mapped to the frequency of checkouts.
Next, I modified the previous graph to become user-interactive visualization illustrating hourly transactions in a navigable 3D space. I expanded the dataset to include five days of data, so that the user can compare daily transaction patterns over a week. The height and color of the boxes indicates the number of transactions for that hour and Dewey category on a particular day.