给3D地图添加3D柱状图使用的功能原理是在地图上加上圆柱对象，可以用颜色和高度分别代表分类和值大小，根据需要将柱状图放置到指定位置即可。3D地图与3D柱状图联合使用，效果大概是这样：

注：根据你项目需求的不同，需要的可能是整个中国的地图数据，也可能是某个省的，市的，县的，区的等，这时怎么办？

1. 去网上搜有很多，但是可能数据不全，或者会员才能下载。

2、CityBuilder 提供了多种地理图形素材，一键生成初始模板，简直是神器！

优点在于普通开发人员也能随手搭建3D地图，可以快速应用于三维城市项目。支持多种建筑、路网、河流等图层的动效渲染，可以在此基础上构建出折线图、柱状图、散点图、K线图、饼图等等，同时支持多图表混合展现等。让大屏变立体就是如此简单！

配合上图表还可以做出更优秀，更酷炫的效果！

看一下3D地图与3D柱状图联合使用的实现代码吧！

var app = new THING.App();
// 设置app背景为黑色
app.background = [0, 0, 0];
var newarr = [];
var newarr2 = [];
var arr = [
 [2165655.1396114295, 4114352.0966101163, 4365832.415936076],
 [2662057.5622300194, 4418588.240325375, 3750750.348959174],
 [1767421.0596036618, 4228474.383904113, 4434558.528500963],
 [2394868.6435673204, 3769006.698589486, 4553000.555517837],
 [2486086.5614174376, 3329024.786824286, 4838712.726484586],
 [1218816.9869283293, 3246017.2371543637, 5352094.171977467],
 [2329539.893699594, 2565281.065092118, 5353712.6602103505],
 [2030091.0181420585, 2113557.693443252, 5664375.176012668],
 [-331990.1761847738, 4095658.023244825, 4876877.566923073]
];
var arr2 = [
 [2616998.3939855373, 4244380.281059966, 3976812.7153125475],
 [2657034.0993919773, 4600324.120928961, 3528972.4762104847],
 [2133668.39296656, 3962963.9461863646, 4518025.034522062],
 [1911719.0939941471, 3859355.61517046, 4703444.055135107],
 [1710907.0406027823, 3597407.209459497, 4980305.344902273],
 [2084471.9009466884, 2966999.365445058, 5245799.075529899],
 [42737.188761066296, 3256126.370391139, 5483013.354519836],
]
var colorMapping = {
 0: "#004FEA",
 0.24: "#004FEA",
 0.241: "#00B3B3",
 0.5: "#00B3B3",
 0.501: "#00B450",
 0.74: "#00B450",
 0.741: "#EAC700",
 1: "#EAC700"
};
 
// 引用地图组件脚本
THING.Utils.dynamicLoad(["https://www.thingjs.com/uearth/uearth.min.js"], function () {
 app.create({
 type: "Map",
 url: "https://www.thingjs.com/citybuilder_console/mapProject/config/TVRFek5ETXdDaXR5QnVpbGRlckAyMDE5",
 complete: function (event) {
  for (var i = 0; i < arr.length; i++) {
 newarr.push(CMAP.Util.convertWorldToLonlat(arr[i]))
 }
 for (var i = 0; i < arr2.length; i++) {
 newarr2.push(CMAP.Util.convertWorldToLonlat(arr2[i]))
 }
 for (var i = 0; i < newarr.length; i++) {
 var coordinates = createCoordinates(newarr[i], 15);
 createPoint(coordinates, colorMapping);
 }
 for (var i = 0; i < newarr2.length; i++) {
 var coordinates = createCoordinates(newarr2[i], 15);
 createPoint(coordinates, colorMapping);
 }
 }
 });
});
 
function createCoordinates(point, n) {
 var coordinates = [];
 for (var i = 0; i < n; i++) {
 var xy = [point[0] + 0.3 * Math.cos(2 * Math.PI * i / n), point[1] + 0.3 * Math.sin(2 * Math.PI * i / n) * 0.75];
 coordinates.push(xy);
 }
 return coordinates;
}
 
/**
 * 创建地理多边形
 */
function createPoint(coordinates, colorMapping) {
 var geoPolygon = app.create({
 type: 'GeoPolygon',
 name: '多边形_纯色',
 coordinates:coordinates, // 支持Polygon和MultiPolygon,格式可参考geoJson规范
 extrudeHeight: 300000, //拉伸高度100m
 renderer: {
 type: 'vector', // 纯色填充
 color: "#EAC700", // 面填充颜色
 lights: false,//默认为true，受光照影响，为false不受光照影响
 colorMapping:colorMapping,
 }
 });
}

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数字孪生可视化