The "Attributes" tab in the Unique Value Thematic Map window is primarily used to set display parameters for unique values in the current Unique Value Thematic Map.

When creating Unique Value Thematic Maps for polygon, line, or point layers respectively, the content displayed in the thematic map attributes window will vary slightly.

1. Expression: Displays and sets the thematic variable for the current Unique Value Thematic Map, which can be a property field or mathematical expression of the current layer.
   • Click the drop-down button next to the "Expression:" combo box to view all property fields of the current vector dataset;
   • Select the thematic variable (single property field) from the dropdown list. Users can also click "Expression..." to build field expressions in the "SQL Expression" dialog as thematic variables.
   • Reset Unique Value after Expression Changed: When checked, the system will automatically reset unique values after modifying the expression, updating the map display in real-time.
   • Custom Expression Support for Point Layer Thematic Maps: Allows setting marker size and rotation angle for point objects, including manual input or selecting property fields from the attribute table.

   Note: For data using Oracle Plus or SQL Plus engines, field expressions must 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 an "Thematic map update failed" error in the output window.

2. Custom Expression: Customize thematic styles using field values. Point datasets support marker style, color, size, and rotation angle; line datasets support line style, color, and width; region datasets support fill style, foreground/background colors, and transparency.
3. Color Scheme: The combo box displays and sets color styles for the current Unique Value Thematic Map.
   • Click the drop-down button to select a color scheme, assigning different colors to each thematic value.
4. Visibility Settings:
   • Use the visibility icon in the toolbar to control visibility for all selected thematic values.
   • Click the visibility icon next to each thematic value to toggle its visibility.
5. Symbol Style Settings: The style buttons in the toolbar set styles for selected thematic values. Users can also click the marker style icon of each value to modify styles. Settings vary by vector dataset type:
   • The "Fill Symbol" button sets fill styles for selected polygon values. Click it or individual fill style icons to open the "Fill Symbol Style Settings" window.
   • The "Line Symbol" button sets line styles for selected line values. Click it or individual line style icons to access "Line Symbol Style Settings".
   • To modify multiple subitem styles simultaneously, hold Shift to select items, then use the style button to batch edit via the "Change Style" dialog.
6. Add/Remove Thematic Values:
   • The Add button manages thematic values. Clicking it opens the management interface to add/delete values or input new ones, with real-time list updates.
   • The Delete button removes selected values. Deleted values will display using default styles.
7. Subitem Sorting & Reverse Color Scheme:
   • Use the Move Up button to shift selected subitems upward.
   • Use the Move Down button to shift selected subitems downward.
   • The Ascending button sorts all subitems by value in ascending order.
   • The Descending button sorts subitems in descending order.

     Note: Hold Shift to select multiple subitems for batch movement. Release Shift before moving will cancel batch operations. Changes are auto-saved.

   • The Reverse Order button inverts the color scheme sequence.
8. Save Color Scheme to Manager: Click this button to save modified color schemes to the color library for reuse in other mapping tasks.
9. Subitem Locating: Right-click selected subitems and choose "Locate" to highlight corresponding objects on the map. Objects within visible bounds will highlight directly; others will center-display at current scale. Note: Ensure the layer is selectable for this function.
10. Group: Right-click selected subitems and choose Merge Groups to combine them into one group for unified style/visibility management. Use Split Group in the context menu to revert.
11. In the thematic value list, beyond visibility and style settings, users can edit values and titles:
    • Unique Value: Displays/edits subitem values. Duplicate values will revert to original.
    • Title: Displays/edits subitem titles directly in cells.

Notes

1. Created or modified Unique Value Thematic Maps can be saved as templates for other layers. See: Save to Thematic Map Template Library.
2. When creating thematic maps via templates, select saved templates from the "Templates" dropdown menu.
3. The "Default Style" shows the style for unadded items in the thematic value list.
4. The stretch function in thematic subitems cannot be used to generate cache.

Related Topics

Modify Unique Value Thematic Map

"Advanced" Tab