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Making Maps With GIS

Making Maps With GIS. Lecture 7 Introduction to Geographic Information Systems Geography 176A 2006 Summer, Session B Department of Geography University of California, Santa Barbara. What is a map?.

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Making Maps With GIS

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  1. Making Maps With GIS Lecture 7 Introduction to Geographic Information Systems Geography 176A 2006 Summer, Session B Department of Geography University of California, Santa Barbara

  2. What is a map? • “A graphic depiction of all or part of a geographic realm in which the real-world features have been replaced by symbols in their correct spatial location at a reduced scale.” power line

  3. Map function in GIS • Storage • Temporary communication • Intermediate check of data • Final report • To be effective, must be correctly designed and constructed.

  4. The Parts of a Map: Map Elements

  5. The medium is the message • Paper • Film • Mylar • Monitor • Projection • Broadcast TV • THE DISPLAY IS PART OF THE SYMBOLIZATION

  6. Cartographic Elements • Medium • Figure • Ground • Reference information

  7. Cartographic Elements (2) • Border • Neatline • Insets • Scale up • Scale down • Metadata e.g. index • Off-map references

  8. Cartographic Elements (3) • Page coordinates • Ground elements • Graticule/Grid • North arrow

  9. Cartographic Elements (4) • Figure • Point/Line/Area symbols • Text • Place Names • Title

  10. Cartographic Elements (5) • Reference Information • Scale • Projection(s) • Sources (2) • Credits • Legend • Reliability

  11. Text: Selection and Placement

  12. Choosing Elements • Map research • Map compilation • Worksheet • Selection • Placement • Layout • Tools in GIS not ideal

  13. Choosing a Map Type • Cartographers have designed hundreds of map types: methods of cartographic representation. • Not all GISs allow all types. • Most have a set of basic types • Depends heavily on the dimension of the data to be shown in the map figure.

  14. Choosing the Wrong Type • Fairly common GIS error. • Due to lack of knowledge about cartographic options. • Can still have perfect symbolization. • Possibility of misinformation • Definite reduction in communication effectiveness.

  15. Map Types: Point Data • Reference • Topographic • Dot • Picture Symbol • Graduated Symbol

  16. Reference Map

  17. Topographic Map

  18. Dot Map

  19. Picture Symbol Map

  20. Graduated Symbol Map

  21. Map Types: Line Data • Network • Flow • Isoline • Reference

  22. Origin of Flow Maps Harness, H. D. (1837). Atlas to Accompany the Second Report of the Railway Commissioners, Ireland. Dublin: Irish Railway Commission.

  23. Flow Map

  24. Map Types: Area Data • Choropleth • Area qualitative • Stepped surface • Hypsometric • Dasymetric • Reference

  25. Area Qualitative Map

  26. Stepped Statistical Surface

  27. Map Types: Volume Data • [Isoline, Stepped Surface, Hypsometric] • Gridded fishnet • Realistic perspective • Hill-shaded • Image map

  28. Isoline Map

  29. Fishnet or Gridded Perspective View

  30. Realistic Perspective View

  31. Hill-shaded Relief Map

  32. Image Map

  33. Map Types: Time • Multiple views • Animation • Moving map • Fly thru • Fly by

  34. Cartographic Animations http://www.ncgia.ucsb.edu/projects/gig/v2/About/abImages/apps/sb_growth.gif http://www.aaronkoblin.com/work/faa/us.html

  35. Spatialization: SOM Skupin, A. (2002) A Cartographic Approach to Visualizing Conference Abstracts. IEEE Computer Graphics and Applications. 22 (1): 50 - 58.

  36. Map Type and Dimensionality

  37. Choosing Types • Check the data • Continuous vs. Discrete • Accuracy & Precision • Reliability • Dimension (Point, Line, Area, Volume) • Scale of Measurment (Nominal etc.) • GIS capability • May need to supplement GIS software

  38. Data Scaling (Stevens) • Nominal (Name of a place) • Ordinal (Small, med., large town) • Interval (Arbitrary zero e.g. Sea Level) • Ratio (Absolute zero e.g. dollars, densities)

  39. Example: Choropleth Mapping • Data should be AREA (e.g. States) • Data should not suffer from area effect. • Population? • Per capita Income? • Elevation? Temperature? • Boundaries unambiguous. • Areas non-overlapping.

  40. Classification • Equal Interval • Natural groups • N-tiles • Equal or unequal? • Logarithmic? Linear? Discontinuous? • How many classes? • Non-overlapping, distinctive groups.

  41. The Need for Design • To appear professional and avoid errors, GIS maps should reflect cartographic knowledge about map design. • A map has a visual grammar or structure that must be understood and used if the best map design is desired. • Cartographic convention (e.g. forests should be green).

  42. Symbolization Errors with a GIS

  43. Map Design • A GIS map is designed in a process called the design loop. • Good map design requires that map elements be placed in a balanced arrangement within the neat line.

  44. The Design Loop • Create map layout as macro • Draw on screen (proof plot) • Look • Edit macro • Repeat until happy • Make final plot

  45. Graphic Editors

  46. Graphic Editor Software • Vector • Adobe Illustrator • CorelDraw • Freehand • Raster • Photoshop • CorelPaint • Fractal Paint

  47. Map Design (2) • Visual balance is affected by: • the "weight" of the symbols • the visual hierarchy of the symbols and elements • the location of the elements with respect to each other and the visual center of the map.

  48. Shading Hue Pattern Line weight Symbol “weight”

  49. Visual center 5% of height 5% of height Portrait Landscape

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