Information Visualization 2 Overview and Navigation Chris North

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Information Visualization 2: Overview and Navigation Chris North cs 3724: HCI

Information Visualization 2: Overview and Navigation Chris North cs 3724: HCI

Review • Shneiderman’s Info. Vis. mantra? • overview first, zoom&filter, details on demand •

Review • Shneiderman’s Info. Vis. mantra? • overview first, zoom&filter, details on demand • Mapping data to graphics? • 1. data items to visual objects • 2. data attributes to visual properties

The Problem Data a detail data zoom data a O+D Screen a d ta

The Problem Data a detail data zoom data a O+D Screen a d ta F+C a data trans

Typical Navigation 1 D scrollbar 2 D scrollbars What’s wrong?

Typical Navigation 1 D scrollbar 2 D scrollbars What’s wrong?

Keyhole Problem • • Where am I? Where can I go? Where do I

Keyhole Problem • • Where am I? Where can I go? Where do I want to go? How do I get there? • Lack of context, overview

Keyhole Problem

Keyhole Problem

Context is Important!

Context is Important!

The Problem Data a detail data zoom data a O+D Screen a d ta

The Problem Data a detail data zoom data a O+D Screen a d ta F+C a data trans

E. g: 3 Overviews of Text (MS Word) Advantages?

E. g: 3 Overviews of Text (MS Word) Advantages?

Visual Overview • • Show me the data! Map, organization (spatial layout of concepts)

Visual Overview • • Show me the data! Map, organization (spatial layout of concepts) What information is (not) available? Adds context info, relationships Enables direct access Encourages exploration HCI metrics: • Improves user performance, learning time, satisfaction Insight

Navigation Strategies • Detail Only • Zooming • Overview+Detail • Focus+Context • Multiple views

Navigation Strategies • Detail Only • Zooming • Overview+Detail • Focus+Context • Multiple views • Distortion, fisheye

Zooming large 2 D spaces • • Powers of 10 http: //terraserver. homeadvisor. msn.

Zooming large 2 D spaces • • Powers of 10 http: //terraserver. homeadvisor. msn. com/image. asp? S=10&T=1&X=2689&Y=20639&Z=17&W=2

Zooming: 2 D • Kid. Pad, Hi. Note, Jazz • http: //www. cs. umd.

Zooming: 2 D • Kid. Pad, Hi. Note, Jazz • http: //www. cs. umd. edu/hcil/jazz/ • Semantic zooming: • Don’t just show things at different size • change objects to make sense • E. g. add/remove detail info • Powers of Ten • Controls?

Overview+Detail: 1 D • See. Soft

Overview+Detail: 1 D • See. Soft

Overview+Detail: 2 D Overview: Detail: Square in overview tightly-coupled to scroll bars of detail

Overview+Detail: 2 D Overview: Detail: Square in overview tightly-coupled to scroll bars of detail • Zoom factor = 5

Multiple levels = large scale overview intermediate view • Zoom factor = 125 intermediate

Multiple levels = large scale overview intermediate view • Zoom factor = 125 intermediate view detail view

Multiple Foci Linkit

Multiple Foci Linkit

Focus+Context: 1 D • Fisheye Menu: http: //www. cs. umd. edu/hcil/fisheyemenu/ • Perspective Wall

Focus+Context: 1 D • Fisheye Menu: http: //www. cs. umd. edu/hcil/fisheyemenu/ • Perspective Wall

Focus+Context: 2 D

Focus+Context: 2 D

Comparison • Zooming: • Screen space efficient • Infinite scalability • Lose overview when

Comparison • Zooming: • Screen space efficient • Infinite scalability • Lose overview when zoom in • Overview+Detail: • Good scalability, chaining • Multiple foci • Disconnect between views, back-n-forth • Focus+Context: • Integrated overview with detail, connected • Least scalable • Distortion, overview unstable

Quiz • Spotfire? • Table. Lens?

Quiz • Spotfire? • Table. Lens?

Design Exercise

Design Exercise