GeoJSON is an open standard geospatial data interchange format that represents simple geographic features and their nonspatial attributes.
To add a GeoJSON layer to a scene, complete the following steps:
-             Click  Add Layers  
 on the Designer  toolbar.            - Click GeoJSON  
 to open the GeoJSON pane. - Provide the URL of the service in the Layer URL text box.
 - Provide a name for the layer in the Layer name text box.
 - Optionally, do the following to append custom parameters to requests made to the service:
- Under Custom parameters, click Configure custom parameters to open the Custom request parameters pane.
 - Click Add parameter.
 - Provide the name of the parameter you want to append in the Parameter text box.
 - Provide the parameter value in the Value text box.
 - Repeat these steps for each parameter you want to append.
 - Click Done to apply the changes and return to the GeoJSON pane.
The specified custom parameters are automatically applied to all requests made to the service.
 
 - Click Add to add the service to the scene.