1. Esri UC2013. Technical Workshop. Technical Workshop 2013 Esri International User Conference July 8–12, 2013 | San Diego, California Generalization for Multi-scale Mapping Edie Punt Jamie Conley

2. Esri UC2013. Technical Workshop. Why Generalize? Data is collected and maintained in high detail When drawn at a smaller scale: - it can be too detailed - symbols can conflict Consider: - visual acuity - output capabilities Generalization for Multi-scale Mapping

3. Esri UC2013. Technical Workshop.Generalization for Multi-scale Mapping

4. Esri UC2013. Technical Workshop.Generalization for Multi-scale Mapping

5. Esri UC2013. Technical Workshop.Generalization for Multi-scale Mapping

6. Esri UC2013. Technical Workshop. Generalization is Subjective Traditionally, generalization was performed manually at the discretion of the cartographer Easy for humans, hard for machines …generalization is difficult to automate Generalization for Multi-scale Mapping “What is qualitatively the same on the ground is also represented in the same way everywhere on the map” Swiss Society of Cartography, 1972

7. Esri UC2013. Technical Workshop. Automated Generalization in ArcGIS Generalization for Multi-scale Mapping

8. Esri UC2013. Technical Workshop. Automated Generalization in ArcGIS Generalization for Multi-scale Mapping 7 and 8command line feature-based generalization 9feature-based generalization in geoprocessing 10.0contextual generalization (roads and buildings) 10.1support for large datasets 10.2quality improvements 9.3.1 10 9.3 9.2 9.1 9.0 10.1 8 7 10.2

9. Esri UC2013. Technical Workshop. Feature-based Generalization Early automated generalization tools considered the geometry of each feature sequentially without regard to symbology or other feature relationships Generalization for Multi-scale Mapping

10. Esri UC2013. Technical Workshop. Contextual Generalization Contextual generalization tools assess multiple features from multiple layers simultaneously - Maintain representative pattern, density, and character - Resolve conflicts between symbolized features at scale Generalization for Multi-scale Mapping

11. Esri UC2013. Technical Workshop. Automated Generalization with Geoprocessing The Cartography toolbox contains tools for generalization and conflict detection Generalization for Multi-scale Mapping

12. Esri UC2013. Technical Workshop. What’s the Difference? Generalization clarifies the display of feature geometry at smaller scales Conflict Resolution manages the extent and placement of symbolized features on maps Use both to retain characteristic form and pattern Generalization for Multi-scale Mapping

13. Esri UC2013. Technical Workshop. Contextual Generalization: Optimization Constraint: ideal restriction on one or more features buildings must be at least 15m apart Action: modify the data to better meet constraints move the building away Reflex: constraint that must be met a building cannot be moved onto a road Generalization for Multi-scale Mapping

14. Esri UC2013. Technical Workshop. Generalizing Roads Generalization for Multi-scale Mapping

15. Esri UC2013. Technical Workshop. Thin Road Network tool Removes less significant roads from display Retains representative pattern and connectivity Visibility controlled by attribute, easy to modify Generalization for Multi-scale Mapping

16. Esri UC2013. Technical Workshop. Resolve Road Conflicts tool Adjust roads to show visual separation - highways, boulevards, dead-ends, roundabouts Less significant roads move to accommodate more significant roads Generalization for Multi-scale Mapping

17. Esri UC2013. Technical Workshop. Merge Divided Roads tool Create a single road feature from ‘parallel’ pairs Merge only equal-class roads together Generalization for Multi-scale Mapping

18. Esri UC2013. Technical Workshop. Collapse Road Detail tool Remove details or open interruptions at intersections Generalization for Multi-scale Mapping

19. Esri UC2013. Technical Workshop. 1:50,000 and 1:100,000 scale Generalizing Roads Demo Generalization for Multi-scale Mapping

20. Esri UC2013. Technical Workshop. Generalizing Buildings Generalization for Multi-scale Mapping

21. Esri UC2013. Technical Workshop. Propagate Displacement tool Adjust adjacent features to reestablish relationships after conflict resolution Use displacement output from other tools - Merge Divided Roads tool - Resolve Road Conflicts tool Generalization for Multi-scale Mapping

22. Esri UC2013. Technical Workshop. Resolve Building Conflicts tool Separate buildings from each other and from barriers - Retain relative density and pattern - Adjust visibility, size, and spacing, orientation Generalization for Multi-scale Mapping

23. Esri UC2013. Technical Workshop. Delineate Built-up Areas tool Use dense groups of buildings to define built-up area polygons using edge features Generalization for Multi-scale Mapping

24. Esri UC2013. Technical Workshop. 1:50,000 and 1:100,000 scale Generalizing Buildings Demo Generalization for Multi-scale Mapping

25. Esri UC2013. Technical Workshop. Generalization Workflows Generalization for Multi-scale Mapping

26. Esri UC2013. Technical Workshop. Partitioning Large Datasets Establish partitions for data - Feature layers, map sheet boundaries, or - use Create Cartographic Partitions tool Generalization for Multi-scale Mapping

27. Esri UC2013. Technical Workshop. Partitioning Large Datasets Set the Cartographic Partitions geoprocessing environment variable to the partitions layer - Each partition processed independently - Edge matching handled Generalization for Multi-scale Mapping

28. Esri UC2013. Technical Workshop. Geoprocessing Workflows Transform data in scale-specific steps - Chain steps in scripts or models - Automate entire workflow, or subdivide with manual editing and verification steps in between Some tools modify inputs; new data not created - Use representations to store changes as overrides - Original geometry is left intact for visual comparison or even reversion Generalization for Multi-scale Mapping

29. Esri UC2013. Technical Workshop. Cartographic Production Workflow Generalization for Multi-scale Mapping Symbolization Scale-specific Data Cartographic Generalization Print Manual Editing Export Share Annotation Data Generalization Map Layout Output Master Database

30. Esri UC2013. Technical Workshop. Multi-scale Mapping Workflow Generalization for Multi-scale Mapping Data Generalization (Generalization toolset) Conflict Resolution (Graphic Conflicts toolset) Detect Graphic Conflicts Thin Road Network Aggregate Polygons Merge Divided Roads Smooth Line Simplify Polygon Smooth Polygon Simplify Buildings Simplify Line Propagate Displacement Resolve Road Conflicts Manual editing Reduce feature complexity Symbolize data for output scale Reduce feature count Delineate Built-Up Areas Collapse Road Detail Resolve Building Conflicts

31. Esri UC2013. Technical Workshop. Multiple scales Large Dataset Workflow Demo Generalization for Multi-scale Mapping

32. Esri UC2013. Technical Workshop. Please fill out the session evaluation Wednesday Offering ID: 1341 Thursday Offering ID: 1428 Online – www.esri.com/ucsessionsurveys Paper – pick up and put in drop box Thank you…

33. Esri UC2013. Technical Workshop.Generalization for Multi-scale Mapping