一、API参考
二、代码
<!DOCTYPE html>
<html lang="en">
<head>
<meta charset="utf-8">
<!-- Include the CesiumJS JavaScript and CSS files -->
<script src="Build/Cesium/Cesium.js"></script>
<link href="Build/Cesium/Widgets/widgets.css" rel="stylesheet">
</head>
<body>
<div id="cesiumContainer"></div>
<script>
// Your access token can be found at: https://cesium.com/ion/tokens.
// Initialize the Cesium Viewer in the HTML element with the `cesiumContainer` ID.
Cesium.Ion.defaultAccessToken = 'eyJhbGciOiJIUzI1NiIsInR5cCI6IkpXVCJ9.eyJqdGkiOiJiMmM0NmVlNC1lNmQwLTQxMzktOTkyMy0zOTJkMGQ4ZDJiMmMiLCJpZCI6MTM3MDgsInNjb3BlcyI6WyJhc2wiLCJhc3IiLCJhc3ciLCJnYyJdLCJpYXQiOjE1NjM4Njc3MjJ9.jx48UCxoKCjDWPVfXZnAkUYDPORWEyIvWrg2ZFuwdRk';
const viewer = new Cesium.Viewer('cesiumContainer', {
terrainProvider: Cesium.createWorldTerrain()
});
var CesiumEventHandler = new Cesium.ScreenSpaceEventHandler(viewer.scene.canvas);
//得到当前三维场景的椭球体
var ellipsoid = viewer.scene.globe.ellipsoid;
CesiumEventHandler.setInputAction(function (movement) {
//选择点击位置获取笛卡尔坐标系
cartesian = viewer.camera.pickEllipsoid(movement.position, ellipsoid);//movement.endPosition
if (cartesian) {
//将笛卡尔坐标转换为地理坐标
var cartographic = Cesium.Cartographic.fromCartesian(cartesian);
var longitudeDegree = Cesium.Math.toDegrees(cartographic.longitude);
var latitudeDegree = Cesium.Math.toDegrees(cartographic.latitude);
var terrainProvider=Cesium.createWorldTerrain()
var positions = [
Cesium.Cartographic.fromDegrees(longitudeDegree, latitudeDegree)
];
//关键函数获取指定地形，级别，位置的高程
var promise=Cesium.sampleTerrain(terrainProvider, 11, positions)
promise.then(res=>{
alert('经度是'+ Cesium.Math.toDegrees(res[0].longitude)+'纬度是'+ Cesium.Math.toDegrees(res[0].latitude)+'高程是'+res[0].height)
})
}
}, Cesium.ScreenSpaceEventType.RIGHT_UP);
</script>
</div>
</body>
</html>
效果如下：
