1. Labeling Rylan Cottrell

2. Excentric Labeling • Textual information is often required to support /supplement a visualization for the identification of critical elements of the display. • How they see the problem: • Lack of labels. • Restrictions on how labels are viewed, i.e., labels can only be viewed one at a time (e.g., tooltips). • Labels can obscure data. • Poor placement of labels can lead to ambiguity. • Data density. • Long labels.

3. Taxonomy of Labeling Techniques • Goal of the layout. • Readable. • No ambiguity between the element and its label. • Labels do not obscure pertinent information. • Static • Label-at-all-cost • Rapid Label – overlaps, data occlusion. • Label-what-you-can – only labels that fit are displayed.

4. Taxonomy Cont’d • Dynamic • Cursor sensitive balloon label – think tooltip. • All or Nothing – labels appear when the number of objects fall below a certain limit.

5. Scatter plot - Excentric

6. Map - Zoom

7. Map - Excentric

8. Cartography - Excentric

9. Particle-Based Labeling • Non-overlapping labeling is NP-Hard. • Needs • Real-time interaction • No preprocessing • No label conflicts - No occlusion • Does not obscure data • No constraints on the labels • Global labeling solution

10. Labeling Pipeline

11. Conflict Detection

12. Results

13. Dynamic Map Labeling • Static Map – goal is to maximize information. • Dynamic Map. • Continuous zoom. • Continuous pan. • Interactive speed. • Purpose – navigation.

14. Dynamic Label Consistency • D1 – Except for sliding in or out of the view area, labels should not vanish when zooming in or appear when zooming out. • D2 – As long as a label is visible, its position and size should change continuously under pan and zoom. • D3 – Except for sliding in or out of the view area, labels should not vanish or appear during panning. • D4 – The placement and selection of any label is a function of the current map state.

15. Dynamic selection – at which scales a label will be selected. • Dynamic placement – a static placement for each scale at which a label is selected. • Filtering • Number of labels much larger then what can be shown in any given view area.

16. Preprocessing • Determine dynamic placement. • Choose the active range for each label. • Interaction • Filter labels on the basis. • Geographic region. • Scale. • For each label not filtered out, display iff the current scale is in active range.

17. NYC

18. NYC - Zoom

19. Google Earth