Modify Graduated Symbol Thematic Map

Feature Description

You can modify various parameters of the graduated symbol thematic map in the "Graduated Symbol Thematic Map" window to achieve thematic map effects that better meet your requirements.

Operational Steps

  1. In the layer manager, select a graduated symbol thematic map layer, right-click and choose the "Modify Thematic Map" command, or double-click the thematic layer. The "Graduated Symbol Thematic Map" window that pops up displays the current settings of the selected graduated symbol thematic map.
  2. Thematic Map Layer: Displays the name of the currently displayed thematic map.
  3. Expression: Used to display and set the thematic variable for creating the current graduated symbol thematic map, which is either a single property field or a mathematical expression of fields.
    • Click the drop-down button next to the "Expression:" combo box. The dropdown list shows all property fields of the vector dataset used to create the current graduated symbol thematic map. By default, fields in this list are displayed as Field Aliases. If needed, you can switch to field names in the File tab -> Options group. For details, refer to the Preference Settings document.
    • Select the thematic variable (a single property field) for the current graduated symbol thematic map layer from the dropdown list; users can also click the "Expression..." item in the dropdown list to open the "SQL Expression" dialog and build a field expression as the thematic variable for the graduated symbol thematic map.
    Notes:
    • When creating a thematic map for data with Oracle Plus or SQL Plus engine types, the field expression can only be a field value or a field calculation, such as (SmID) or (SmID + 1). Conditional expressions are currently not supported for setting thematic map fields. If the set field expression is a conditional expression, e.g., "SmID > 100", the created thematic map will fail, and the output window will prompt "Thematic map update failed".
  4. Classification Method: Used to determine the size of graduated symbols. Click the drop-down button, and the dropdown list shows all the value resampling methods provided by the application. Users can select an appropriate value resampling method from this list according to their mapping needs.
    • Constant: Performs classification based on the linear proportion of the original values in the attribute table.
    • Square Root: Performs classification based on the proportion of the square root of the original values in the attribute table.
    • Logarithm: Performs classification based on the proportion of the natural logarithm of the original values in the attribute table.
  5. Baseline Value: Used to set the numerical value represented by the system's marker size. Based on this value, the system automatically calculates the marker sizes corresponding to other values according to the classification method. A larger baseline value results in a smaller final display size for point symbols. The valid range for the baseline value is the same as the range of the thematic variable.
    • Users can enter the baseline value in the text box on the right.
  6. Symbol Style Settings: Click the button to the right of the "Positive", "Show Zero", and "Show Negative" labels to pop up the "Styles" window and set the style for positive baseline value, zero value, and negative value graduated symbols. You must first select the checkbox to the left of the corresponding category before setting the style for zero and negative values. Changes to the marker style for positive baseline value, zero value, and negative value do not affect each other.
    • Positive Baseline Value Style: Sets the rendering style for graduated symbols when the field expression value is positive. Click the button to the right of this label to open the "Styles" window (i.e., the "Symbol Library" window. For specific operations, see: "Symbol Library" Window). In this window, you can set the display style for positive baseline value graduated symbols.
    • Show Zero: If this checkbox is selected, objects with a field expression value of zero can be rendered using the thematic style; otherwise, they are not rendered. Click the button to the right of this label to open the "Styles" window (i.e., the "Symbol Library" window. For specific operations, see: "Symbol Library" Window). In this window, you can set the display style for zero value graduated symbols.
    • Show Negative: If this checkbox is selected, objects with a negative field expression value can be rendered using the thematic style; otherwise, they are not rendered. Click the button to the right of this label to open the "Styles" window (i.e., the "Symbol Library" window. For specific operations, see: "Symbol Library" Window). In this window, you can set the display style for negative value graduated symbols.
    • Flow: If this checkbox is selected, the rendering style of the thematic map can be displayed in flow, meaning graduated symbols will move as the map changes to achieve an optimized effect of showing all. When the flow effect is enabled, do not use the partial refresh function, as it may cause the partial refresh effect to display incorrectly (SuperMap iDesktopX does not support the partial refresh function).
  7. Offset Settings:
    • Offset Unit: The drop-down button to the right of this label is used to set the unit for the offset value. Click this drop-down button. In the pop-up menu, the system provides two offset units for user selection: "Unit" and "0.1mm". "0.1mm" indicates the symbol's offset is in units of 0.1mm; "Unit" means the set offset is consistent with the unit of the map coordinate system.
    • Offset X: Used to set the offset x of graduated symbols relative to the objects they represent. You can directly enter a numerical value to set the offset; alternatively, you can select a numeric field from this layer and use the field value as the offset.
    • Vertical Offset: Used to set the offset y of graduated symbols relative to the objects they represent. You can directly enter a numerical value to set the offset; alternatively, you can select a numeric field from this layer and use the field value as the offset.
    • Show Leader Line: If this checkbox is selected, when graduated symbols are offset from the objects they annotate, a leader line can connect them. At the same time, the "Line Style" button to the right of the label becomes available. Click this button to open the "Styles" window, where users can set the symbol style for the leader line. For details, see: Line Symbol Style Settings.
  8. All parameters in the "Graduated Symbol Thematic Map" window are reflected in real-time on the corresponding thematic map layer in the current map, achieving a What-You-See-Is-What-You-Get effect. Users can also disable real-time refresh by unchecking the "Enable Instant Refresh" checkbox at the bottom of the dialog. If the "Enable Instant Refresh" checkbox is not checked, users can click the "Apply" button at the bottom of the dialog after completing the parameters to apply the dialog settings to the current thematic map.
Notes:
  • Both created and modified graduated symbol thematic maps can be saved as templates for application to thematic map creation in other layers. For details on saving as a thematic map template, see: Save to Thematic Map Template Library.
  • When creating a thematic map using the "Use Template" method, you can directly select a saved template from the dropdown menu of the "Template" drop-down button and apply it to the creation of other thematic maps.

Related Topics

Create Graduated Symbol Thematic Map