Spatial Data

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  • Created by: mollyb
  • Created on: 13-06-13 18:52
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  • Spatial Data
    • Maps
      • simplest form of displaying data over space with relevant features
      • display of spatial pattern of a vast range of data
    • Isopleths or Isolines
      • makes spatial patterns out of point form data by using lines to join up points with the same value
      • isopleths are lines that represent the same value at the points is an area through which it passes
      • contour lines
      • colour and shading can be used to fill in the area between isopleths to stress value changes
      • Limitations
        • selection of the interval between isopleths is crucial
        • shape and size needs to be considered for units
        • should be smooth, not angular or erratic
    • choropleths
      • gives quick visual impression of patterns
      • density maps where areas are shaded in to represent the average number per unit area
      • limitations
        • treats the area as a whole so hides variations within area
        • scale of the areal division is crucial
        • colours are difficult to use so should be avoided
        • shading range important
  • choropleths
    • gives quick visual impression of patterns
    • density maps where areas are shaded in to represent the average number per unit area
    • limitations
      • treats the area as a whole so hides variations within area
      • scale of the areal division is crucial
      • colours are difficult to use so should be avoided
      • shading range important

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