A choropleth map is a thematic map in which areas are shaded or patterned in proportion to the measurement of the statistical variable being displayed on the map, such as population density or per-capita income.
For each data layer, certain attributes can be set:

  • Label: A label identifying the layer will appear in the legend.
  • Visibility zoom range: Minimum and maximum zoom range in which the layer is visible. Outside the range, the layer becomes invisible.
  • Initial visibility: Even if a layer is in the visible range, it can be set to hidden by default. The user can set it to visible when needed.
  • Category: Layers can be grouped into categories.
  • Geometry rendering types: Usually, spatial databases have three kinds of geometric types: point, line and polygon. However, due to the nature of the data it can sometimes be more useful to draw geometries in a special format.
  • Heat map: Suitable for mapping density.


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