本段位加载kml，生成entity数据形式，并通过material属性来实现想要的线性。
一、加载kml的端口
Cesium.KmlDatasource.load();viewer.dataSources.add()
data |
Resource | String | Document | Blob |
A url, parsed KML document, or Blob containing binary KMZ data or a parsed KML document. |
options |
Object |
An object with the following properties:
| Name |
Type |
Default |
Description |
camera |
Camera |
|
The camera that is used for viewRefreshModes and sending camera properties to network links. |
canvas |
Canvas |
|
The canvas that is used for sending viewer properties to network links. |
sourceUri |
String |
|
optional Overrides the url to use for resolving relative links and other KML network features. |
clampToGround |
Boolean |
false |
optional true if we want the geometry features (Polygons, LineStrings and LinearRings) clamped to the ground. |
ellipsoid |
Ellipsoid |
Ellipsoid.WGS84 |
optional The global ellipsoid used for geographical calculations. |
|
var viewer = new Cesium.Viewer('cesiumContainer');
viewer.dataSources.add(Cesium.KmlDataSource.load("地址"）, { camera: viewer.scene.camera, canvas: viewer.scene.canvas,
clampToGround：true//设置贴地 }) );
二、