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【SDK】【站点】【新增Cesium1.84版本示例】 · MapGIS/WebClient-JavaScript@15d45af · GitHub

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潘卓然ParnDeedlit
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【SDK】【站点】【新增Cesium1.84版本示例】
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‎src/mapboxgl/package.json‎

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{
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"name": "@mapgis/webclient-es6-mapboxgl",
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"version": "10.5.14",
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"version": "15.6.1",
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"description": "",
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"main1": "dist-libs/webclient-mapboxgl-plugin.min.js",
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"module": "index.js",

‎src/service/package.json‎

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{
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"name": "@mapgis/webclient-es6-service",
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"version": "10.5.14",
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"version": "15.6.1",
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"description": "中地数码基于ES6语法针对igserver的服务封装",
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"main1": "dist-libs/webclient-es6-service.min.js",
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"module": "index.js",
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"author": "Wuhan Zondy Cyber Science&Technology Co.Ltd.",
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"license": "Apache-2.0",
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"dependencies": {
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"core-js": "^3.6.5",
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"@turf/turf": "^6.5.0",
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"axios": "^0.26.0",
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"core-js": "^3.21.1",

‎website/public/static/demo/cesium-new/markdown/internet/baidu.md‎

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# 原理
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国内的图商数据都强制要求数据加密一次火星坐标系 (GCJ-02) ,因此整个地图是产生了偏移。
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## 核心原理
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1. 通过 **反解析** 火星坐标系 (GCJ-02) 得到 **WGS84（CGCS2000椭球）无偏数据**
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2. 然后根据无偏数据在Cesium的切分模型上进行对应的**纠偏校正处理**
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3. ![](./images/tileschame.png)
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## 高德
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高德相对简单就是基于墨卡托投影的前提下进行简单的位置纠偏
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![](./images/mercator.png)
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![](./images/format.png)
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![](./images/geom.png)
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| 纠偏前 | 纠偏后 |
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| ------------------------------ | ----------------------------- |
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| ![](./images/gaode_before.png) | ![](./images/gaode_after.png) |
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## 百度
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分2类：WGS84椭球纠偏和 BD09坐标系的偏移
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``` js
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this._crs = options.crs || 'BD09';
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if (options.crs === 'WGS84') {
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var resolutions = [];
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for (var i = 0; i < 19; i++) {
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resolutions[i] = 256 * Math.pow(2, 18 - i);
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}
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this._tilingScheme = new BaiduTilingScheme({
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resolutions: resolutions,
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rectangleSouthwestInMeters: new Cartesian2(-20037726.37, -12474104.17),
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rectangleNortheastInMeters: new Cartesian2(20037726.37, 12474104.17)
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});
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} else {
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this._tilingScheme = new WebMercatorTilingScheme({
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rectangleSouthwestInMeters: new Cartesian2(-33554054, -33746824),
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rectangleNortheastInMeters: new Cartesian2(33554054, 33746824)
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});
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}
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```
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### BD09坐标系
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原理和高德纠偏几乎一致
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![](./images/mercator.png)
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### WGS84坐标系
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基于百度独特的**最后一级256像素**的分辨率机制进行对应的计算
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| 级别 | 分辨率 resolutions = 256 * Math.pow(2, 18 - level) |
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| ---- | ------------------------------------------------------ |
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| 0 | 33554432 |
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| 1 | 16777216 |
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| 2 | 8388608 |
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| 3 | 4194304 |
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| 4 | 2097152 |
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| 5 | 1048576 |
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| 6 | 524288 |
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| 7 | 262144 |
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| 8 | 131072 |
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| 9 | 65536 |
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| 10 | 32768 |
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| 11 | 16384 |
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| 12 | 8192 |
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| 13 | 4096 |
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| 14 | 2048 |
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| 15 | 1024 |
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| 16 | 512 |
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| 17 | 256 |
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上面的表格对应百度独特的切分模型经纬网，需要建立一个百度特有的网格切分模型**BaiduTilingScheme**
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| 纠偏前 | 纠偏后 |
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| ------------------------------ | ----------------------------- |
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| ![](./images/baidu_before.png) | ![](./images/baidu_after.png) |
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## 任意投影 + 瓦片切分规则
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**已实现，不公开原理**

‎website/public/static/demo/cesium-new/markdown/internet/images/baidu_after.png‎

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‎website/public/static/demo/cesium-new/markdown/internet/images/baidu_before.png‎

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‎website/public/static/demo/cesium-new/markdown/internet/images/format.png‎

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‎website/public/static/demo/cesium-new/markdown/internet/images/gaode_after.png‎

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‎website/public/static/demo/cesium-new/markdown/internet/images/gaode_before.png‎

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‎website/public/static/demo/cesium-new/markdown/internet/images/geom.png‎

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‎website/public/static/demo/cesium-new/markdown/internet/images/mercator.png‎

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