官方教程地址：http://lbs.tianditu.gov.cn/docs/#/sanwei/

天地图的地形加载的效果如下，这里绘制了一个Cesium.CorridorGraphics类型的Entity，来验证地形的起伏效果：

实现代码如下：

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<!DOCTYPE html>
<html lang="zh-CN">
  <head>
    <title>天地图三维服务接入</title>
    <script
      type="text/javascript"
      cesium="true"
      src="https://api.tianditu.gov.cn/cdn/demo/sanwei/static/cesium/Cesium.js"></script>
    <script
      type="text/javascript"
      cesium="true"
      src="https://api.tianditu.gov.cn/cdn/plugins/cesium/Cesium_ext_min.js"></script>
    <script
      type="text/javascript"
      cesium="true"
      src="https://api.tianditu.gov.cn/cdn/plugins/cesium/long.min.js"></script>
    <script
      type="text/javascript"
      cesium="true"
      src="https://api.tianditu.gov.cn/cdn/plugins/cesium/bytebuffer.min.js"></script>
    <script
      type="text/javascript"
      cesium="true"
      src="https://api.tianditu.gov.cn/cdn/plugins/cesium/protobuf.min.js"></script>
    <link
      rel="stylesheet"
      cesium="true"
      href="https://api.tianditu.gov.cn/cdn/demo/sanwei/static/cesium/Widgets/widgets.css" />
    <style>
      html,
      body {
        height: 100%;
        margin: 0;
        padding: 0;
        overflow: hidden;
      }

      #cesiumContainer {
        height: 100%;
      }

      #cesiumContainer .cesium-viewer-bottom {
        display: none;
      }
    </style>
  </head>
  <body>
    <div id="cesiumContainer"></div>
    <script>
      const token = "11c161d1558ad38a25a080da1ab26784";
      // 服务域名
      const tdtUrl = "https://t{s}.tianditu.gov.cn/";
      // 服务负载子域
      var subdomains = ["0", "1", "2", "3", "4", "5", "6", "7"];

      var viewer = new Cesium.Map("cesiumContainer", {
        shouldAnimate: true, //是否允许动画
        selectionIndicator: false,
        baseLayerPicker: false,
        fullscreenButton: false,
        geocoder: false,
        homeButton: false,
        infoBox: false,
        sceneModePicker: false,
        timeline: false,
        navigationHelpButton: false,
        navigationInstructionsInitiallyVisible: false,
        showRenderLoopErrors: false,
        shadows: false,
      });

      // 抗锯齿
      viewer.scene.fxaa = true;
      viewer.scene.postProcessStages.fxaa.enabled = false;
      // 水雾特效
      viewer.scene.globe.showGroundAtmosphere = true;
      // 设置最大俯仰角，[-90,0]区间内，默认为-30，单位弧度
      viewer.scene.screenSpaceCameraController.constrainedPitch =
        Cesium.Math.toRadians(-20);
      viewer.scene.screenSpaceCameraController.autoResetHeadingPitch = false;
      viewer.scene.screenSpaceCameraController.inertiaZoom = 0.5;
      viewer.scene.screenSpaceCameraController.minimumZoomDistance = 50;
      viewer.scene.screenSpaceCameraController.maximumZoomDistance = 20000000;
      viewer.scene.screenSpaceCameraController.zoomEventTypes = [
        Cesium.CameraEventType.RIGHT_DRAG,
        Cesium.CameraEventType.WHEEL,
        Cesium.CameraEventType.PINCH,
      ];
      viewer.scene.screenSpaceCameraController.tiltEventTypes = [
        Cesium.CameraEventType.MIDDLE_DRAG,
        Cesium.CameraEventType.PINCH,
        {
          eventType: Cesium.CameraEventType.LEFT_DRAG,
          modifier: Cesium.KeyboardEventModifier.CTRL,
        },
        {
          eventType: Cesium.CameraEventType.RIGHT_DRAG,
          modifier: Cesium.KeyboardEventModifier.CTRL,
        },
      ];
      // 取消默认的双击事件
      viewer.cesiumWidget.screenSpaceEventHandler.removeInputAction(
        Cesium.ScreenSpaceEventType.LEFT_DOUBLE_CLICK
      );

      // 叠加影像服务
      var imgMap = new Cesium.UrlTemplateImageryProvider({
        url: tdtUrl + "DataServer?T=img_w&x={x}&y={y}&l={z}&tk=" + token,
        subdomains: subdomains,
        tilingScheme: new Cesium.WebMercatorTilingScheme(),
        maximumLevel: 18,
      });
      viewer.imageryLayers.addImageryProvider(imgMap);

      // 叠加国界服务
      var iboMap = new Cesium.UrlTemplateImageryProvider({
        url: tdtUrl + "DataServer?T=ibo_w&x={x}&y={y}&l={z}&tk=" + token,
        subdomains: subdomains,
        tilingScheme: new Cesium.WebMercatorTilingScheme(),
        maximumLevel: 10,
      });
      viewer.imageryLayers.addImageryProvider(iboMap);

      // 叠加地形服务
      var terrainUrls = new Array();

      for (var i = 0; i < subdomains.length; i++) {
        var url =
          tdtUrl.replace("{s}", subdomains[i]) +
          "mapservice/swdx?T=elv_c&tk=" +
          token;
        terrainUrls.push(url);
      }

      var provider = new Cesium.GeoTerrainProvider({
        urls: terrainUrls,
      });

      viewer.terrainProvider = provider;

      // 叠加三维地名服务
      var wtfs = new Cesium.GeoWTFS({
        viewer,
        //三维地名服务，使用wtfs服务
        subdomains: subdomains,
        metadata: {
          boundBox: {
            minX: -180,
            minY: -90,
            maxX: 180,
            maxY: 90,
          },
          minLevel: 1,
          maxLevel: 20,
        },
        depthTestOptimization: true,
        dTOElevation: 15000,
        dTOPitch: Cesium.Math.toRadians(-70),
        aotuCollide: true, //是否开启避让
        collisionPadding: [5, 10, 8, 5], //开启避让时，标注碰撞增加内边距，上、右、下、左
        serverFirstStyle: true, //服务端样式优先
        labelGraphics: {
          font: "28px sans-serif",
          fontSize: 28,
          fillColor: Cesium.Color.WHITE,
          scale: 0.5,
          outlineColor: Cesium.Color.BLACK,
          outlineWidth: 2,
          style: Cesium.LabelStyle.FILL_AND_OUTLINE,
          showBackground: false,
          backgroundColor: Cesium.Color.RED,
          backgroundPadding: new Cesium.Cartesian2(10, 10),
          horizontalOrigin: Cesium.HorizontalOrigin.LEFT,
          verticalOrigin: Cesium.VerticalOrigin.TOP,
          eyeOffset: Cesium.Cartesian3.ZERO,
          pixelOffset: new Cesium.Cartesian2(5, 5),
          disableDepthTestDistance: undefined,
        },
        billboardGraphics: {
          horizontalOrigin: Cesium.HorizontalOrigin.CENTER,
          verticalOrigin: Cesium.VerticalOrigin.CENTER,
          eyeOffset: Cesium.Cartesian3.ZERO,
          pixelOffset: Cesium.Cartesian2.ZERO,
          alignedAxis: Cesium.Cartesian3.ZERO,
          color: Cesium.Color.WHITE,
          rotation: 0,
          scale: 1,
          width: 18,
          height: 18,
          disableDepthTestDistance: undefined,
        },
      });

      //三维地名服务，使用wtfs服务
      wtfs.getTileUrl = function () {
        return (
          tdtUrl +
          "mapservice/GetTiles?lxys={z},{x},{y}&VERSION=1.0.0&tk=" +
          token
        );
      };

      // 三维图标服务
      wtfs.getIcoUrl = function () {
        return tdtUrl + "mapservice/GetIcon?id={id}&tk=" + token;
      };

      wtfs.initTDT([
        {
          x: 6,
          y: 1,
          level: 2,
          boundBox: { minX: 90, minY: 0, maxX: 135, maxY: 45 },
        },
        {
          x: 7,
          y: 1,
          level: 2,
          boundBox: { minX: 135, minY: 0, maxX: 180, maxY: 45 },
        },
        {
          x: 6,
          y: 0,
          level: 2,
          boundBox: { minX: 90, minY: 45, maxX: 135, maxY: 90 },
        },
        {
          x: 7,
          y: 0,
          level: 2,
          boundBox: { minX: 135, minY: 45, maxX: 180, maxY: 90 },
        },
        {
          x: 5,
          y: 1,
          level: 2,
          boundBox: { minX: 45, minY: 0, maxX: 90, maxY: 45 },
        },
        {
          x: 4,
          y: 1,
          level: 2,
          boundBox: { minX: 0, minY: 0, maxX: 45, maxY: 45 },
        },
        {
          x: 5,
          y: 0,
          level: 2,
          boundBox: { minX: 45, minY: 45, maxX: 90, maxY: 90 },
        },
        {
          x: 4,
          y: 0,
          level: 2,
          boundBox: { minX: 0, minY: 45, maxX: 45, maxY: 90 },
        },
        {
          x: 6,
          y: 2,
          level: 2,
          boundBox: { minX: 90, minY: -45, maxX: 135, maxY: 0 },
        },
        {
          x: 6,
          y: 3,
          level: 2,
          boundBox: { minX: 90, minY: -90, maxX: 135, maxY: -45 },
        },
        {
          x: 7,
          y: 2,
          level: 2,
          boundBox: { minX: 135, minY: -45, maxX: 180, maxY: 0 },
        },
        {
          x: 5,
          y: 2,
          level: 2,
          boundBox: { minX: 45, minY: -45, maxX: 90, maxY: 0 },
        },
        {
          x: 4,
          y: 2,
          level: 2,
          boundBox: { minX: 0, minY: -45, maxX: 45, maxY: 0 },
        },
        {
          x: 3,
          y: 1,
          level: 2,
          boundBox: { minX: -45, minY: 0, maxX: 0, maxY: 45 },
        },
        {
          x: 3,
          y: 0,
          level: 2,
          boundBox: { minX: -45, minY: 45, maxX: 0, maxY: 90 },
        },
        {
          x: 2,
          y: 0,
          level: 2,
          boundBox: { minX: -90, minY: 45, maxX: -45, maxY: 90 },
        },
        {
          x: 0,
          y: 1,
          level: 2,
          boundBox: { minX: -180, minY: 0, maxX: -135, maxY: 45 },
        },
        {
          x: 1,
          y: 0,
          level: 2,
          boundBox: { minX: -135, minY: 45, maxX: -90, maxY: 90 },
        },
        {
          x: 0,
          y: 0,
          level: 2,
          boundBox: { minX: -180, minY: 45, maxX: -135, maxY: 90 },
        },
      ]);

      const e = viewer.entities.add({
        corridor: {
          positions: Cesium.Cartesian3.fromDegreesArray([
            117.11, 36.2634, 117.09, 36.282, 117.07, 36.282,
          ]),
          width: 2000.0,
          material: Cesium.Color.GREEN.withAlpha(0.5),
        },
      });

      viewer.zoomTo(e);

      // const e = viewer.entities.add({
      //   rectangle: {
      //     coordinates: Cesium.Rectangle.fromDegrees(-122.3, 46.0, -122.0, 46.3),
      //     material: Cesium.Color.RED.withAlpha(0.5),
      //   },
      // });

      // viewer.zoomTo(e);
    </script>
  </body>
</html>