Continuous cartography: generalisation for mixed …...Citymapper, 2017 DC WMATA .gif Toward...

Continuous cartography: generalisation for mixed-scale and mixed-space map views

Lucas Godfrey and William Mackaness

The University of Edinburgh

20th ICA Workshop on Map Generalisation and Multiple Representation

Mobile devices: small-scale mapping, in context

From discrete to continuous cartographic representation

Citymapper, 2017

DC WMATA .gif

Toward task-based generalisation for continuous cartography

DC Test Route

1. Start >

2. Walk >

3. Metro (Orange) >

4. Metro (Red) >

5. Walk >

6. Destination

Citymapper, 2017

Representing a single journey object

Crossing conceptual cusps

Smoothed transition: network view, from walking to Orange metro line

Smoothed transition: polygon features, from Red metro line back to ‘street’ level

Distinguishing the functional from the structural

Smoothed transition: network view, from walking to Orange metro line

Example property graph

startturningPoint1

turningPoint2

turningPoint3

turningPoint4

transferPoint1

turningPoint5

transferPoint3

transferPoint2

turningPoint6

destination

Concluding comments

lucas.godfrey@ed.ac.uk

Appendix

Example node property: angularRange

-90

a

b

0180

90