1 / 21

Chapter 4

Chapter 4. Mapping density. Outline- Chapter 4. Why map density? Deciding what to map Two ways of mapping density Mapping density for defined areas Creating a density surface. Why map density?. Shows highest concentrations Useful to map patterns Mapping areas of different sizes.

kay-grant
Download Presentation

Chapter 4

An Image/Link below is provided (as is) to download presentation Download Policy: Content on the Website is provided to you AS IS for your information and personal use and may not be sold / licensed / shared on other websites without getting consent from its author. Content is provided to you AS IS for your information and personal use only. Download presentation by click this link. While downloading, if for some reason you are not able to download a presentation, the publisher may have deleted the file from their server. During download, if you can't get a presentation, the file might be deleted by the publisher.

E N D

Presentation Transcript

  1. Chapter 4 Mapping density

  2. Outline- Chapter 4 • Why map density? • Deciding what to map • Two ways of mapping density • Mapping density for defined areas • Creating a density surface GIS Analysis – Volume 1- A. Mitchell

  3. Why map density? • Shows highest concentrations • Useful to map patterns • Mapping areas of different sizes

  4. Examples of mapping density: • Crime Density • Population risks of ERW • Mapping D.C. Embassies • Golf course density • Population density

  5. Deciding what to map • What kind of feature data do you have? • Do you want to map features or feature values?

  6. Two ways of mapping density • Mapping density for defined areas • Creating a density surface

  7. Two ways of mapping density • Comparing methods • Choosing a method • Map by area: data already summed by area; comparisons of administrative or natural areas with defined borders • Map by density surface: to see concentration of point or line features

  8. Mapping density for defined areas • Calculating density value for defined area

  9. Mapping density for defined areas • Creating a dot density map

  10. Mapping density for defined areas • Creating a dot density map- issues & enhancements

  11. Creating a density surface • What the GIS does • Calculating density values- parameters • Cell size • Search radius • Calculation method • Units

  12. Creating a density surface • Calculating density values- parameters • Cell size

  13. Creating a density surface • Calculating density values- parameters • Search radius

  14. Creating a density surface • Calculating density values- parameters • Calculation method

  15. Creating a density surface • Calculating density values- parameters • Units

  16. Creating a density surface • Data summarized by area but want density surface

  17. Creating a density surface • Display density surface using graduated colors

  18. Creating a density surface • Display density surface using graduated colors • Number of classes • Color shading for high-low values

  19. Creating a density surface • Display density surface using contours

  20. Creating a density surface • Analyze results Smaller search radius Larger search radius

  21. Creating a density surface • Analyze results

More Related