HCDE210 — #6 — Visualization

— Link to the Tableau Visualization:

Visualization for the future Seattle Visitors

Explore how to use the Tableau and make the data neat and clear to the users:

This time, I studied how to use the Tableau to create graphs and illustrative data that will help users have a clear understanding of a huge set of data. By experiencing the process of downloading the data, making different graphs of those data (maps, tree maps and linear graphs) and upload the results to the public server, I finally knew how to make an efficient and useful visualization to the visitors who are planning to go to Seattle for a vacation by using the 911 calls data. I did well with the different forms of the graphs and knew how to navigate between different kinds of graphs, but I sometimes felt a little confused about the meanings of the word descriptions in measures and dimensions.(i.e., zone/beat, hundred block location) It’s better for me to read the data source more carefully next time.

Part of the data source that I use


What question did the visualization raise?

Since the visualization I did target at the visitors who are planning to visit Seattle, it takes a little time for me to think about what kind of data and information they need the most. I finally decided to focus on the safety issue based on the 911 calls data. However, we can see the safety level doesn’t vary significantly in different districts through the packed bubble graphs. Will this issue really matter to the visitors? Should I turn to focus on other issues based on this data?

There are no big differences in the size of the packed bubbles

What might I do differently next time?

The aim of the visualization is to help the users find the information they need and answer their questions, so it might be better for me to do some user research and talk to the past visitors to Seattle to find out what kind of issue they care about the most in Seattle. I could improve the visualization by doing those things.

How to choose the most appropriate form of the graph to show the data?

There are several different types of graphs in Tableau that we could use, but sometimes it might take a while to find out the most appropriate form of the graph apply to the data that we want to show to the users.

To make the visualization efficient and choose the right graph to show the data, we need to remember Tufte’s principles of visualization. We need to make the data understandable and show them in a limited space. The verbal and visual descriptions are both needed. For example, if the users want a comparison of the size of the data, the bar graphs is better than other forms because it can make the data in the ascending or descending order. In that way, the users could compare the data really quick and efficient.

Make the bar graph in the ascending order

Based on the different tasks that the users want to complete and the Tufte’s principles of visualization, we could find the most efficient form of the graph to show the data.