Methods of Geographic Visualization: Data Classification, Spatial Aggregation, Multiple Maps in View, and Map Comparison (Especially for GATE-Geospatial 2022)

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There are four types of methods of geographic visualization:

Diagram Shows Four Types of Methods of Geographic Visualizat …

Data Classification

Map Shows Rate of Unemployment in 1997

The top map shows rate of unemployment in 1997 as either above or below the national average of 4.9 % . The bottom map uses the mean and standard deviation (SD) for data classification.

  • Classification method and number of classes
  • Make multiple versions and choose
  • Link and what-if questions
  • Reclassification for raster data- data simplification, data isolation, data ranking
  • Integer easier to use

Spatial Aggregation

Map Shows Percent Population Change by State, 1990 - 2000

The top map shows percent population change by state, 1990 – 2000. The darker the symbol, the higher the percent increase. The bottom map shows percent population change by region.

Multiple Maps in View

Map Shows Deer Relocations in SE Alaska

An example of using multiple maps in data exploration. In this view of deer relocations in SE Alaska, the focus is on the distribution of deer relocations along the clear-cut/old forest edge.

Map Comparison

This Map Showing a Bivariate Map

A bivariate map showing the combinations of

  • Rate of unemployment in 1997, either or the national average, and
  • Rate of income change 1996 – 98, either or the national average.
    • Same schema
    • On/off display
    • Multiple Views
    • Chart symbols
    • Bivariate choropleth (limited number of classes)

Developed by: