Cesium JS API
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sampleTerrainMostDetailed

CesiumJS 中的一个方法,可用于从最详细的高程数据源中获取地形高度信息。

语法

Cesium.sampleTerrainMostDetailed(terrainProvider, positions)

参数

  • terrainProvider:地形提供程序。
  • positions:一个 Cesium.Cartesian3 对象数组,每个对象表示一个位置。

返回值

一个 promise 对象,当处理结束后返回一个包含高度信息的数组。该数组的长度等于传入 positions 数组的长度。如果处理过程中发生了错误,promise 将会以拒绝状态结束,并传递错误信息。

高度信息是一个包含以下三个属性的对象:

  • longitude:经度。
  • latitude:纬度。
  • height:高度,单位为米。

示例

var viewer = new Cesium.Viewer('cesiumContainer');

// 创建一个加载器并添加到场景中
var terrainLoader = new Cesium.CesiumTerrainLoader({
    url: '//assets.agi.com/stk-terrain/world'
});
viewer.terrainProvider = new Cesium.CesiumTerrainProvider({
    url: '//assets.agi.com/stk-terrain/world',
    requestWaterMask: true,
    requestVertexNormals: true,
    requestTileGeometry: true,
    requestMetadata: true,
    terrainDataStructure: ['heightmap'],
    heightmapTerrainQuality: 1.0
});

var positions = [
    Cesium.Cartesian3.fromDegrees(101.0, 29.0),
    Cesium.Cartesian3.fromDegrees(-77.0, 43.0)
];

Cesium.sampleTerrainMostDetailed(viewer.terrainProvider, positions).then(function(heights) {
    console.log(heights);
});

异常

terrainProvider 不是 Cesium.TerrainProvider 的实例时,将会抛出 DeveloperError 异常。

如果传入的 positions 数组为空,方法将不会执行处理,并返回一个空的 promise 对象。

如果处理过程中出现了错误,promise 将会以拒绝状态结束,并传递一个包含错误信息的异常对象。