Multi-Dimensional Data Visualization cs5984: Information Visualization Chris North

Quiz What is the purpose of visualization? What is our class motto? How can we map data to graphics?

Information Types Multi-dimensional: databases,… 1D: timelines,… 2D: maps,… 3D: volumes,… Hierarchies/Trees: directories,… Networks/Graphs: web, communications,… Document collections: digital libraries,…

Multi-dimensional Fewer dimensions = easier Data mapping, Cleveland’s rules 1,2,3-D scatterplots … We will return to some more interesting 1,2,3-D cases later

Many Dimensions? What about many dimensional data? n-D …

Glyphs: Chernoff Faces 10 Parameters: Head Eccentricity Eye Eccentricity Pupil Size Eyebrow Slope Nose Size Mouth Vertical Offset Eye Spacing Eye Size Mouth Width Mouth Openness

Glyphs: Stars

Multiple Views with Brushing and linking

Scatterplot Matrix All pairs of attributes Brushing and linking

… on steroids

Different Arrangements of Axes Axes are good –Lays out all points in a single space –“position” is 1 st in Cleveland’s rules –Uniform treatment of dimensions Space > 3 ?

Parallel Coordinates Inselberg, “Multidimensional detective” (parallel coordinates) Ganesh, Christa

Star Coordinates Kandogan, “Star Coordinates” Rohit, David

Star Plot

Assignment Book chapter 3 Read for Thurs: Rao, “Table Lens” »Harsha, Vishal Keim, “VisDB” »Ming, Binli Homework #1 due Thurs

Next Week Tues: Dynamic Queries Tweedie, Spence, “Externalizing Abstract Mathematical Models” (Attribute/Influence Explorer) » Doan, “Query Previews” » Thurs: Multi-D Functions Feiner, “Worlds within Worlds” » ???, “HyperSlice” »