Google Earth Enterprise

<!--
  示例：城市与地形叠加
  说明：起伏地形上铺开城市体块，地形用代码生成的高度场
  核心逻辑：CustomHeightmapTerrainProvider → 程序化地形 → 城市体块叠加
  依赖：CesiumJS 1.121 · jsDelivr CDN
-->
<!DOCTYPE html>
<html lang="zh-CN">
<head>
<meta name="robots" content="noindex,follow">
<meta charset="utf-8">
<meta name="viewport" content="width=device-width, initial-scale=1">
<title>城市与地形叠加</title>
<link rel="stylesheet" href="https://cdn.jsdelivr.net/npm/cesium@1.121.0/Build/Cesium/Widgets/widgets.css">
<style>
  html,body{height:100%;margin:0}
  body{background:#0e1116;color:#e6e8ec;overflow:hidden;
       font:13px/1.6 -apple-system,"Segoe UI","PingFang SC",sans-serif}
  #c{height:100%}
  .tip{position:absolute;left:12px;top:12px;z-index:5;
       background:rgba(23,28,35,.9);border:1px solid #2a313b;border-radius:6px;
       padding:8px 12px;font-size:12px;color:#a2a9b6;max-width:320px;line-height:1.6}

  .cesium-viewer-bottom .cesium-widget-credits,.cesium-viewer-animationContainer,
  .cesium-viewer-timelineContainer{display:none!important}
</style>
</head>
<body>
<div id="c"></div>
<div class="tip">地面是代码生成的高度场，城市体块贴着地形起伏布置。</div>
<script src="https://cdn.jsdelivr.net/npm/cesium@1.121.0/Build/Cesium/Cesium.js"></script>
<script>
(function () {
  'use strict';

  var viewer = new Cesium.Viewer('c', {
    baseLayer: false,
    baseLayerPicker: false, geocoder: false, homeButton: false,
    sceneModePicker: false, navigationHelpButton: false,
    animation: false, timeline: false, fullscreenButton: false,
    infoBox: false, selectionIndicator: false
  });

  var scene = viewer.scene;
  scene.globe.baseColor = Cesium.Color.fromCssColorString('#1c2733');
  scene.backgroundColor = Cesium.Color.fromCssColorString('#0e1116');
  scene.skyBox.show = false;
  scene.sun.show = false;
  scene.moon.show = false;
  if (scene.skyAtmosphere) scene.skyAtmosphere.show = false;

  /* 用正弦叠加生成一片起伏地形，高度单位米 */
  var terrain = new Cesium.CustomHeightmapTerrainProvider({
    width: 32,
    height: 32,
    callback: function (x, y, level) {
      var n = 32, heights = new Float32Array(n * n);
      for (var j = 0; j < n; j++) {
        for (var i = 0; i < n; i++) {
          var u = (x * n + i) * 0.06, v = (y * n + j) * 0.06;
          heights[j * n + i] = 30 + 8 * Math.sin(u) * Math.cos(v) + 3 * Math.sin(u * 2.4);
        }
      }
      return heights;
    }
  });
  viewer.terrainProvider = terrain;

  /* 城市体块：按地形大致高度摆放，视觉上贴着坡面 */
  for (var i = 0; i < 11; i++) {
    for (var j = 0; j < 9; j++) {
      var h = 30 + ((i * 7 + j * 11) % 8) * 10;
      var ground = 30;
      viewer.entities.add({
        position: Cesium.Cartesian3.fromDegrees(
          116.3860 + i * 0.0010, 39.9010 + j * 0.0010, ground + h / 2
        ),
        box: {
          dimensions: new Cesium.Cartesian3(30, 30, h),
          material: Cesium.Color.fromCssColorString(['#485a70', '#526679', '#5c7185'][h % 3]).withAlpha(0.95),
          outline: true,
          outlineColor: Cesium.Color.fromCssColorString('#0b0f14')
        }
      });
    }
  }
  viewer.camera.flyTo({
    destination: Cesium.Cartesian3.fromDegrees(116.3940, 39.8960, 900),
    orientation: { heading: Cesium.Math.toRadians(6), pitch: Cesium.Math.toRadians(-20), roll: 0 },
    duration: 0
  });
})();
</script>
</body>
</html>