1. Remove features for multiscale mapping Select, Eliminate, Refine, Filter (e.g., definition query on size), Prune (new USGS hydro tools), Thin (new ArcGIS road thinning tools) Concept is not treated systematically in literature or tools Be systematic about use of elimination through scale (39%!) Database-driven cartography needs importance attributes for all feature types to drive elimination of labels and features

2. ScaleMaster.org – multiscale design decisions

3. Populated place labels – case study

4. Incorp. GNIS ptCDPMCDCounty Dynamic labels in ArcGIS, no annotation

5. Incorp. GNIS ptCDPMCDCounty

6. Incorp. GNIS ptCDPMCDCounty

7. Incorp. GNIS ptCDPMCDCounty

8. Incorp. GNIS ptCDPMCDCounty Elimination matters!

9. Label sizes by population and map scale Label pattern for incorporated places (C5) only Details…See Brewer presentation from ICA Commission meeting on Generalisation and Multiple Representation last week aci.ign.fr

10. Hydrography case study

11. Hydrography data for smaller scale ‘Display’ and ‘Geometry’ changes – Pruning (remove in database) C- – Simplification Gs – Collapse (centerline replaces river area) Gc – Selection on size (remove in database or remove symbol) C- estimated upstream drainage area (UDA) polygon area – Reclassify (categories, taper by UDA) Cc Also, symbol lightness, width, label size, label removal… Sc Sz La L- Brewer and Buttenfield, 2010, Geoinformatica

12. Hydro change through scale Fuller map design context (captures from ArcGIS screen) Compare geometry/display change to display only solutions 11 slides, with toggling through versions at each scale

14. 24K hydro data (OK at 36K)

15. 24K hydro data (not suited to 72K)

16. 50-200K LoD (OK at 72K)

17. 50-200K LoD (OK at 144K)

18. 50-200K LoD (not suited to 289K)

19. Geometry solution 200-500K LoD (OK at 289K)

20. 50-200K LoD (display-only solution at 288K)

21. 500K-1M LoD (OK at 578K)

22. Elimination decisions in ScaleMaster

23. Remove features for multiscale mapping Of 94 changes in draft ScaleMaster: 30% label changes (including removing labels) 26% symbol changes 14% geometry changes (not yet applied to all themes) 31% content changes Content and label removal are 39% of design decisions in this draft multiscale mapping (20K to 1M) To>