KML Network Link Service

The KML Network Link service accepts and carries out transformation requests as specified by a workspace, returning the results as a KML Network Link that you can use with Google Earth.

Note:If you install this service, you must also install the Data Streaming service.

This service can be requested using a URL or form. For example,

http:///fmekmllink//.fmw?

The resulting response is a KMZ file that contains a KML Network Link. This link's URL points to theData Streaming serviceand references the requested workspace. No translation is performed to provide the KMZ file. The results are always as up-to-date as the update interval in Google Earth.

Note:When Google Earth (or other application) is running and the KMZ file is loaded, the workspace that generated the file runs on a repeated basis until the application is closed. The default frequency is every 60 seconds. To change, update the REFRESH_INTERVAL directive in the KML Network Link properties file. This file is located in \Utilities\tomcat\webapps\fmekmllink\WEB-INF\conf\propertiesFile.properties.

Requirements

This service works with any workspace that writes KML and KMZ files. The following published parameters should exist in the workspace:

• bboxEast: Bounding Box East
• Bboxwest.：边缘边框
• bboxNorth: Bounding Box North
• Bboxsouth.：南方边框

When the KML Network Link layer is enabled, Google Earth passes the extents of its current view window to these parameters. The coordinates are in lat-long. A workspace can use these parameters to read the source data with spatial queries.

Response Elements

如果KML网络链接服务成功的过程sses the request, it returns a KML document enclosed in KMZ format to the client as a data stream. The KML document contains a NetworkLink element where Link/href is set to a URL. This URL invokes the FME Server Data Streaming service with the provided repository and workspace name. For a complete reference of the KML format, refer to:http://code.google.com/apis/kml/documentation/

如果响应格式指定为XML或JSON，则服务故障响应可能包含下表中所示的元素。

Element	Child Elements	Value	Description
statusInfo	信息	信息string	service failure message
	status	success | failure	service status

See Also