3D Tiles Nga Gpm Visualization

<!--
  示例：月降水量的柱状可视化
  说明：十二根圆柱分别代表 12 个月，柱高与颜色都按降水量映射
  核心逻辑：data 数组 → cylinder.length 缩放高度 → Color.fromHsl 映射颜色 → 标签标注月份
  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>月降水量的柱状可视化</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">柱高与颜色都对应降水量：7 月最高最深，1 月最矮最浅。柱子底面对齐地面。</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;

  /* 12 个月的降水值，单位毫米 */
  var rainfall = [12, 18, 32, 48, 76, 112, 148, 132, 86, 52, 26, 14];
  var months = ['1月', '2月', '3月', '4月', '5月', '6月',
                '7月', '8月', '9月', '10月', '11月', '12月'];

  function ramp(v) {
    var t = v / 150;
    return Cesium.Color.fromHsl(0.62 - t * 0.45, 0.72, 0.58 - t * 0.12, 0.9);
  }

  rainfall.forEach(function (v, i) {
    var lon = 116.3852 + i * 0.00115;
    var h = v * 0.7;
    viewer.entities.add({
      position: Cesium.Cartesian3.fromDegrees(lon, 39.907, h / 2),
      cylinder: {
        length: h,
        topRadius: 4,
        bottomRadius: 4,
        material: ramp(v),
        outline: true,
        outlineColor: Cesium.Color.WHITE.withAlpha(0.25)
      },
      label: {
        text: months[i],
        font: '500 11px sans-serif',
        fillColor: Cesium.Color.WHITE,
        pixelOffset: new Cesium.Cartesian2(0, 14),
        disableDepthTestDistance: Number.POSITIVE_INFINITY
      }
    });
  });

  viewer.entities.add({
    position: Cesium.Cartesian3.fromDegrees(116.3922, 39.907, 0),
    label: {
      text: '月降水量（毫米）· 柱高按数值缩放',
      font: '600 13px sans-serif',
      fillColor: Cesium.Color.WHITE,
      showBackground: true,
      backgroundColor: Cesium.Color.fromCssColorString('#1b232e').withAlpha(0.85),
      pixelOffset: new Cesium.Cartesian2(0, -30)
    }
  });

  viewer.camera.flyTo({
    destination: Cesium.Cartesian3.fromDegrees(116.3922, 39.9002, 260),
    orientation: { heading: 0, pitch: Cesium.Math.toRadians(-16), roll: 0 },
    duration: 0
  });
})();
</script>
</body>
</html>