Modify Graduated Symbol Thematic Map

Feature Description

In the "Graduated Symbol Thematic Map" window, users can modify various parameters of the graduated symbol thematic map to achieve more customized thematic mapping effects.

Steps

  1. Select a graduated symbol thematic map layer in the Layer Manager, right-click the "Modify Thematic Map" command, or double-click the thematic layer. The "Graduated Symbol Thematic Map" window will display the current settings of the selected thematic map.
  2. Thematic Map Layer: Displays the name of the current thematic map.
  3. Expression: Shows and sets the thematic variable (either a single property field or mathematical expression) used to create the current graduated symbol thematic map.
    • Click the drop-down button next to the "Expression:" combo box. The dropdown lists all property fields of the vector dataset used to create the current thematic map.
    • Select the thematic variable (single property field) from the dropdown. Users can also click "Expression..." to build field expressions in the "SQL Expression" dialog as thematic variables.

    Note: For Oracle Plus and SQL Plus engine datasets, field expressions can only be field values or arithmetic operations (e.g., SmID or SmID+1). Conditional expressions like "SmID > 100" are unsupported and will cause thematic map creation failure, with error messages in the output window.

  4. Classification Method: Determines symbol sizing. Click the drop-down to select resampling methods:
    • Constant: Uses original linear proportions from attribute values.
    • Square Root: Uses square root proportions of original values.
    • Logarithm: Uses natural logarithm proportions of original values.
  5. Base Value: Sets the numerical value represented by the marker size. The system automatically calculates other marker sizes based on this value. Larger base values result in smaller symbol sizes. Valid range matches the thematic variable's value range.
    • Enter the base value in the text box.
  6. Symbol Style Settings: Click buttons next to "Positive", "Show Zero", and "Show Negative" labels to configure styles. Check corresponding checkboxes before styling zero/negative values. Style changes are independent across categories.
    • Positive Value Style: Sets rendering style for positive values. Click the button to open the Symbol Library window.
    • Show Zero: When checked, zero-value objects are rendered. Click the button to configure zero-value symbol styles.
    • Show Negative: When checked, negative-value objects are rendered. Click the button to configure negative-value symbol styles.
    • Flow: When enabled, symbols dynamically adjust positions during map navigation for optimal visibility. Avoid using partial refresh when flow is active (Note: SuperMap iDesktopX doesn't support partial refresh).
  7. Offset Settings:
    • Offset Unit: Select measurement unit from dropdown: "Unit" (matches map coordinate system) or "0.1mm".
    • Offset X: Sets horizontal offset. Enter numerical values or select numerical field values.
    • Offset Y: Sets vertical offset. Enter numerical values or select numerical field values.
    • Show Leader Line: When checked, displays connection lines between symbols and their original positions. Click "Line Style" to configure leader lines via Line Symbol Settings.
  8. Parameters in the dialog update the map in real-time (WYSIWYG). Uncheck "Enable Instant Refresh" at the bottom to disable live preview. Click "Apply" to manually update changes when real-time refresh is disabled.

Notes

  1. Thematic maps can be saved as templates for reuse. See: Save to Thematic Map Template Library.
  2. When creating thematic maps via templates, select saved templates from the "Templates" dropdown menu.