Regional Aggregation Map

Feature Description

The Regional Aggregation Map aggregates point datasets within specified regions based on selected grouping fields, where the aggregation size remains constant during zoom operations.

This map type is ideal for visualizing distributions such as housing prices or GDP across cities in a region.

Feature Entry

  • Thematic Map tab -> Aggregation Map group -> Regional Aggregation Map.
  • Layer Manager -> Layer context menu -> Create Thematic Map... -> Aggregation Map -> Regional Aggregation Map.

Parameter Description

Parameters for Regional Aggregation Map are configured in the Layer Properties panel. Detailed explanations are as follows:

  • For Display Control and Change Dataset group settings, refer to Layer Common Properties Setup.
  • Parameters group explanations:
    • Group Field: Specifies regional aggregation fields (e.g., town, province, city).
    • Aggregation Field: Requires numeric field type. Omit when only counting points. For value aggregations (e.g., average housing prices), select this field and corresponding aggregate method.
    • Aggregate: Determines resampling method with five options: Average, Count, Maximum, Minimum, Sum.
    • Show Label: Controls label display with these parameters:
      • Text Style: Configures font, size, slant angle, color, outline, shadow, and font effects (bold, strikethrough, italic, underline, shadow, transparent background, outline).
      • Label Expression: Defines label format via SQL Expression dialog:
        • Field List: Displays two available fields. Double-click to add to expression.
        • String: Provides character functions. See SQL Query Functions string table.
        • Aggregate: Offers calculation functions. See SQL Query Functions aggregate table.
        • Operators: "||" for concatenation and "\n" for line breaks.
        • Expression Builder: Manually input expressions with strings enclosed in single quotes.
        • Preview: Real-time expression result visualization.
      • Display Precision: Sets decimal places for numeric labels.
      • Line Spacing: Adjusts vertical spacing between multi-line labels.
    • Marker Style: Configures aggregation symbols:
      • Point Symbol: Select symbol type from gallery.
      • Max/Min Symbol Size: Controls visual scaling range.
      • Color: Choose from color ramp or custom color picker.
      • Min/Max Color Transparency: Sets opacity for color ramp endpoints.

Below shows a housing price visualization example. For detailed steps, refer to Application Example of Regional Aggregation Map.