Choropleth layer

Chart style

The choropleth layer is a subcomponent of the 3D globe that supports independent style and data configuration. It uses GeoJSON data to display area boundaries and render region-specific styles, which is suitable for visualizing geographic data on the 3D globe.

Style panel

• Search Configuration: Click the Style icon in the upper right corner of the panel to enter the name of the configuration item you wish to locate in the search field. The system supports fuzzy matching. For more information, see Search configuration item.

• Height: The relative height of the choropleth layer within the sphere layer. Valid values: 1.5 to 10.

• Show Only Borders: When enabled, only boundary lines are displayed. When disabled, both area surfaces and boundary lines are shown, with customizable styles.

• Minimum Value: The color assigned to the area with the smallest value. For modifications, see the color picker description.

• Maximum Value: The color assigned to the area with the largest value.

• No Value: The color for areas without data, where the corresponding adcode is missing in the geographic boundary data.

• Surface Transparency: The transparency of the area surfaces.

• Border Color: The color of the area boundary lines. For modifications, see the color picker description.

• Border Transparency: The transparency of the boundary lines. Valid values: 0 to 1.

• Border Width: The width of the boundary lines. Valid values: 0 to 0.2.

• Interaction Switch: When enabled, you can set the highlight color that appears when an area is clicked.

Data source panel

• Geographic Boundary Geojson Data Interface: Applies extracted GeoJSON boundary data to DataV. The configuration is similar to that of the Basic Flat Map component's Choropleth Layer. For more information, see the data source panel.

• Area Surface Data Interface

  Field	Description
  adcode	The adcode of the area.
  value	The area value, used together with the Maximum Value, Minimum Value, and No Value settings to determine the area color. Note The color gradient from maximum to minimum is calculated based on the value range in the data.

Advanced panel

When the interaction feature is enabled, a data request is triggered and a temporary variable is emitted when an area is activated or its activation is resumed. This enables dynamic loading of different area data. For details, see component interaction configuration.

Blueprint interaction

1. Click the icon in the upper left corner of the page to access the Blueprint page.

2. In the Layer Node tab, add the current component to the main canvas.

3. Review the blueprint configuration parameters.

   • Event

     Event	Description
     When The Geographic Boundary Geojson Data Interface Request Is Completed	Triggered after the geographic boundary GeoJSON data request completes and the filter processes the data. The processed JSON data is emitted. For data examples, see the Data Source tab in the component's right configuration panel in the canvas editor, under the Data Response Result section.
     When The Area Surface Data Request Is Completed	Triggered after the area surface data request completes and the filter processes the data. The processed JSON data is emitted. For data examples, see the Data source tab in the component's right configuration panel in the canvas editor, under the Data response result section.
     Area Activation	Triggered when a specific area is activated. The activation data is emitted.
     Activation Recovery	Triggered when the activation of a specific area is resumed. The deactivation data is emitted.

   • Action

     Action	Description
     Request Geographic Boundary GeoJSON Data Interface	Re-requests data from the server using the data emitted by an upstream data processing node or layer node as parameters. For example, if a choropleth layer uses an API data source https://api.test and the data provided to the Request Geographic Boundary Geojson Data Interface action is { id: '1'}, the resulting request URL is https://api.test?id=1.
     Request Surface Data for Area Interface	Re-requests data from the server using the output of an upstream data processing node or layer node as parameters. For example, if a choropleth layer uses an API data source https://api.test and the Request Area Surface Data Interface action receives { id: '1'} as input, the resulting request URL is https://api.test?id=1.
     Import Geographic Boundary GeoJSON Data Interface	Imports processed data that matches the component's rendering format and redraws the component without re-fetching from the server. For data examples, see the Data Source tab in the right configuration panel of the canvas editor, under the Data Response Result section.
     Import Area Surface Data Interface	Imports processed data that matches the component's rendering format and redraws the component without re-fetching from the server. For data examples, see the Data Source tab in the component's right configuration panel in the canvas editor, under the Data Response Result section.
     Toggle Visibility: Toggles the component between visible and hidden. No parameters required.	Toggles the component between visible and hidden. No parameters required.
     Show: Makes the component visible. See the data example.	Makes the component visible. See the data example. { "animationType": "",//Animation type. Optional value: fade. No animation if not filled. "animationDuration": 1000,//Animation delay in ms. "animationEasing": ""//Animation curve }
     Hide: Hides the component. See the data example.	Hides the component. See the data example. { "animationType": "",//Animation type. Optional value: fade. No animation if not filled. "animationDuration": 1000,//Animation delay in ms. "animationEasing": ""//Animation curve }
     Update Component Configuration	Dynamically updates the component's style configuration. Click Copy Configuration To Clipboard in the Style panel to copy the configuration data, then modify the field values in the data processing node on the blueprint editor's configuration page.