arcgis js（四）加载天地图

矫情吗；* 2022-09-03 07:19 220阅读 0赞

# 继续进阶(ง •\_•)ง #

之前我们一直使用arcgsi自带的底图或者地图，总有违和感，体现不出来咱们的优势，借此机会讲讲咱们国家为老百姓提供的 [国家地理信息公共服务平台-天地图][-]，也是非常的好用，如果不是为了使用arcgis的地理处理工具和server我才不用arcgisヾ(≧へ≦)〃

# 一、概述 #

在2021年6月，esri公司发布了ArcGIS API for JavaScript 4.20，该版本包含了一系列改进，官网：[Overview | ArcGIS API for JavaScript][Overview _ ArcGIS API for JavaScript]，大部分的使用方法在这里都能找到。为了体现测绘和地理信息系统的特殊性和专业性，特别是要引入国家2000坐标系，与当前测绘成果和国家政策相吻合，以提高地理信息资料的精度，需要将地图坐标系设置为**wkid:4490**，同时国内还提供了地理信息公共平台**天地图**，具有较新的影像底图和矢量底图，以及对应的注记，极大的方便了测绘工作者，如何将两者有效的结合显得尤为重要。天地图提供了web端和移动端的开发接口，在此记录web端的**ArcGIS+天地图**的使用方法，为两者的普及工作做一份贡献。移动端的使用方式见[arcgis for android 入门与提高（五）加载天地图\_郝大大的博客-CSDN博客\_android studio 天地图][arcgis for android _-CSDN_android studio]

别忘了去天地图[天地图API][API]**注册key**，不废话，直接上代码：

# 二、配置方式 #

<!DOCTYPE html>
    <html>
    
    <head>
        <meta charset="utf-8" />
        <meta name="viewport" content="initial-scale=1,maximum-scale=1,user-scalable=no" />
        <title>测试</title>
    
        <link rel="stylesheet" href="https://js.arcgis.com/4.20/esri/themes/light/main.css" />
        <script src="https://js.arcgis.com/4.20/"></script>
    
        <style>
            html,
            body,
            #viewDiv {
                padding: 0;
                margin: 0;
                height: 100%;
                width: 100%;
            }
        </style>
    
        <script>
            require([
                "esri/Map",
                "esri/layers/WebTileLayer",
                'esri/layers/support/TileInfo',
                'esri/views/MapView',
                "esri/layers/FeatureLayer",
                "esri/geometry/SpatialReference",
                "esri/geometry/Point",
    
            ], function (Map, WebTileLayer, TileInfo, MapView, FeatureLayer, SpatialReference, Point) {
                var tiandituBaseUrl = "http://{subDomain}.tianditu.com"; //天地图服务地址
                var token = ""; //天地图token，在官网申请
                var tileInfo = new TileInfo({
                    "rows": 256,
                    "cols": 256,
                    "compressionQuality": 0,
                    "origin": {
                        "x": -180,
                        "y": 90
                    },
                    "spatialReference": {
                        "wkid": 4490
                    },
                    "lods": [
                        { "level": "1", "scale": 295829355.45, "resolution": 0.703125 },
                        { "level": "2", "scale": 147914677.725, "resolution": 0.3515625 },
                        { "level": "3", "scale": 73957338.8625, "resolution": 0.17578125 },
                        { "level": "4", "scale": 36978669.43125, "resolution": 0.087890625 },
                        { "level": "5", "scale": 18489334.715625, "resolution": 0.0439453125 },
                        { "level": "6", "scale": 9244667.3578125, "resolution": 0.02197265625 },
                        { "level": "7", "scale": 4622333.67890625, "resolution": 0.010986328125 },
                        { "level": "8", "scale": 2311166.839453125, "resolution": 0.0054931640625 },
                        { "level": "9", "scale": 1155583.4197265625, "resolution": 0.00274658203125 },
                        { "level": "10", "scale": 577791.7098632812, "resolution": 0.001373291015625 },
                        { "level": "11", "scale": 288895.8549316406, "resolution": 0.0006866455078125 },
                        { "level": "12", "scale": 144447.9274658203, "resolution": 0.00034332275390625 },
                        { "level": "13", "scale": 72223.96373291015, "resolution": 0.000171661376953125 },
                        { "level": "14", "scale": 36111.98186645508, "resolution": 0.0000858306884765625 },
                        { "level": "15", "scale": 18055.99093322754, "resolution": 0.00004291534423828125 },
                        { "level": "16", "scale": 9027.99546661377, "resolution": 0.000021457672119140625 },
                        { "level": "17", "scale": 4513.997733306885, "resolution": 0.000010728836059570312 },
                        { "level": "18", "scale": 2256.9988666534423, "resolution": 0.000005364418029785156 },
                        { "level": "19", "scale": 1128.4994333267211, "resolution": 0.000002682209014892578 }
                    ]
                })
    
                //影像地图
                var tiledLayer = new WebTileLayer({
                    urlTemplate: tiandituBaseUrl + "/DataServer?T=img_c&x={col}&y={row}&l={level}&tk=" + token,
                    subDomains: ["t0", "t1", "t2", "t3", "t4", "t5", "t6", "t7"],
                    tileInfo: tileInfo,
                    spatialReference: { wkid: 4490 },
                });
    
                //影像注记
                var tiledLayerAnno = new WebTileLayer({
                    urlTemplate: tiandituBaseUrl + "/DataServer?T=cia_c&x={col}&y={row}&l={level}&tk=" + token,
                    subDomains: ["t0", "t1", "t2", "t3", "t4", "t5", "t6", "t7"],
                    tileInfo: tileInfo,
                    spatialReference: { wkid: 4490 },
                });
    
                //定位到济南市中心
                var cityCenter = new Point(116.985, 36.671, new SpatialReference({ wkid: 4490 }));
    
                // 创建地图
                var map = new Map({
                    basemap: {
                        baseLayers: [tiledLayer, tiledLayerAnno]
                    },
                });
    
                var view = new MapView({
                    container: "viewDiv",
                    map: map,
                    center: cityCenter,
                    zoom: 12,
                    ui: {
                        components: ["zoom", "compass"]
                    }
                });
                //显示经纬度坐标
                view.on("click", (event) => {
                    let lat = Math.round(event.mapPoint.latitude * 1000) / 1000;
                    let lon = Math.round(event.mapPoint.longitude * 1000) / 1000;
                    alert(lon + ", " + lat);
                });
    
            });
        </script>
    </head>
    
    <body>
        <div id="viewDiv"></div>
    </body>
    
    </html>

# 效果： #

![watermark_type_ZmFuZ3poZW5naGVpdGk_shadow_10_text_aHR0cHM6Ly9ibG9nLmNzZG4ubmV0L0hCX1Byb2dyYW1tZXI_size_16_color_FFFFFF_t_70][]

# 三、天地图其他图层加载方式 #

[-]: https://www.tianditu.gov.cn/
[Overview _ ArcGIS API for JavaScript]: https://developers.arcgis.com/javascript/latest/
[arcgis for android _-CSDN_android studio]: https://blog.csdn.net/HB_Programmer/article/details/107731664
[API]: http://lbs.tianditu.gov.cn/home.html
[watermark_type_ZmFuZ3poZW5naGVpdGk_shadow_10_text_aHR0cHM6Ly9ibG9nLmNzZG4ubmV0L0hCX1Byb2dyYW1tZXI_size_16_color_FFFFFF_t_70]: /images/20220829/b2803d6c72a541dfab15956501c34dcc.png