UNIT 5 - RASTER GIS CAPABILITIES

UNIT 5 - RASTER GIS CAPABILITIES

Compiled with assistance from Micha Pazner, University of Manitoba


For Information that Supplements the Contents of this Unit:

Buffers: Distance Transformations (Chrisman/U of Washington)
Comprehensive Operations: Incremental Operations (Chrisman/U of Washington) -- Iterative operations; viewshed; influencing viewsheds; accumulated cost surfaces.
Map Overlay (Chrisman/U of Washington) -- Integrating information from diverse sources; steps to carry out overlay; discover relationships from geometry; assumption of uniformity.
Map Overlay: Some Examples (Chrisman/U of Washington) -- Numerous GRASS applications.
Surfaces (Chrisman/U of Washington) -- Types of surfaces; slope; slope gradient and aspect in a grid; convergence/divergence; computing properties of a surface.


  • A. INTRODUCTION
  • B. DISPLAYING LAYERS
  • C. LOCAL OPERATIONS
  • D. OPERATIONS ON LOCAL NEIGHBORHOODS
  • E. OPERATIONS ON EXTENDED NEIGHBORHOODS
  • F. OPERATIONS ON ZONES (GROUPS OF PIXELS)
  • G. COMMANDS TO DESCRIBE CONTENTS OF LAYERS
  • H. ESSENTIAL HOUSEKEEPING
  • REFERENCES
  • EXAM AND DISCUSSION QUESTIONS
  • NOTES
  • This unit continues the overview of raster GIS. If possible, we suggest that you replace and/or supplement the graphics provided with this unit with graphics generated by the raster program your students will be using in their labs. Alternatively, the best way to illustrate this unit may be through the use of a laboratory demonstration.

    Consider providing handouts to the students that summarize the commands for the raster GIS program you will be using in labs. Check your program's manual for a command summary or do a screen dump of the appropriate help screen if there is one.

    UNIT 5 - RASTER GIS CAPABILITIES

    Compiled with assistance from Micha Pazner, University of Manitoba

    A. INTRODUCTION

    B. DISPLAYING LAYERS

    Basic display

    Other types of display

    C. LOCAL OPERATIONS

    Recoding

    Overlaying layers

    D. OPERATIONS ON LOCAL NEIGHBORHOODS

    Filtering

    Slopes and aspects

    E. OPERATIONS ON EXTENDED NEIGHBORHOODS

    Distance

    Buffer zones

    Visible area or "viewshed"

    F. OPERATIONS ON ZONES (GROUPS OF PIXELS)

    Identifying zones

    Areas of zones

    Perimeter of zones

    Distance from zone boundary

    Shape of zone

    G. COMMANDS TO DESCRIBE CONTENTS OF LAYERS

    One layer

    More than one layer

    Zones on one layer

    H. ESSENTIAL HOUSEKEEPING

    REFERENCES

    Berry, J.K., 1987. "Fundamental operations in computer- assisted map analysis," International Journal of Geographical Information Systems 1:119-136. Describes a logical and consistent way of classifying and grouping raster GIS functions.

    Burrough, P.A., 1986. Principles of Geographical Information Systems for Land Resource Assessment, Clarendon, Oxford. Chapter 5 is a comprehensive review of raster GIS.

    Star, J.L. and J.E. Estes, 1990. Geographic Information Systems: An Introduction, Prentice Hall. A comprehensive text on GIS, with excellent treatment of raster systems.

    Tomlin, C.D., 1990. Geographic Information Systems and Cartographic Modeling, Prentice-Hall, Englewood Cliffs, NJ. A comprehensive approach to analysis and modeling using raster systems - an excellent introduction to GIS- based analysis.

    User documentation for any raster GIS.

    EXAM AND DISCUSSION QUESTIONS

    1. Discuss the classification scheme proposed by Berry in the article listed in the references. Is it logical and comprehensive? Can you suggest improvements based on the material in this unit or the functions of a specific raster GIS to which you have access?

    2. A variety of user interfaces have been used in raster GISs, including typed commands, menus and responses to

    questions. Discuss the advantages and disadvantages of each.

    3. "The most valuable skill in GIS is the ability to take a real problem and convert it into a series of GIS operations". Discuss.


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    Last Updated: August 30, 1997.