（二十）ArcGIS JS 加载WMTS服务（超图示例）

快来打我* 2021-09-17 05:24 1206阅读 0赞

### 前言 ###

在前一篇中说到我们可以通过加载WMS服务解决用ArcGIS API加载超图发布的服务，但是WMS服务在加载效率上是低于切片服务的，加上超图的IServer，无力吐槽，所以，在加载速度的要求下，切片的WMTS服务更符合要求。

### 加载WMTS服务的要点 ###

*  identifier：图层标识
 *  tileMatrixSet：切片矩阵标识
 *  extent：加载范围
 *  spatialReference：控件参考
 *  version：WMTS服务版本号
 *  dpi：平铺方案的dpi
 *  lods:定义切片方案的一系列细节层次。

![在这里插入图片描述][watermark_type_ZmFuZ3poZW5naGVpdGk_shadow_10_text_aHR0cHM6Ly9ibG9nLmNzZG4ubmV0L2lkb215d2F5_size_16_color_FFFFFF_t_70]  
![在这里插入图片描述][watermark_type_ZmFuZ3poZW5naGVpdGk_shadow_10_text_aHR0cHM6Ly9ibG9nLmNzZG4ubmV0L2lkb215d2F5_size_16_color_FFFFFF_t_70 1]

### 实现效果 ###

![在这里插入图片描述][watermark_type_ZmFuZ3poZW5naGVpdGk_shadow_10_text_aHR0cHM6Ly9ibG9nLmNzZG4ubmV0L2lkb215d2F5_size_16_color_FFFFFF_t_70 2]

### 实现代码 ###

<!DOCTYPE html>
    <html>
        <head>
            <meta http-equiv="Content-Type" content="text/html; charset=utf-8">
        
            <meta name="viewport" content="initial-scale=1, maximum-scale=1,user-scalable=no">
        <title>Map with WMTS resourceinfo</title>
        
            <link rel="stylesheet" type="text/css" href="http://localhost:8080/arcgis_js_api/library/3.25/3.25/esri/css/esri.css" />
            <script type="text/javascript" src="http://localhost:8080/arcgis_js_api/library/3.25/3.25/init.js"></script>
        
            <style>
                html,
                body,
                #map {
                    height: 100%;
                    width: 100%;
                    margin: 0;
                    padding: 0;
                }
            </style>
        
            <script>
                require([
                    "esri/map",
                    "esri/layers/WMTSLayer",
                    "esri/layers/WMTSLayerInfo",
                    "esri/geometry/Extent",
                    "esri/layers/TileInfo",
                    "esri/SpatialReference",
                    "dojo/parser",
                    "dijit/layout/BorderContainer",
                    "dijit/layout/ContentPane",
                    "dojo/domReady!"
                ], function (
                    Map,
                    WMTSLayer,
                    WMTSLayerInfo,
                    Extent,
                    TileInfo,
                    SpatialReference,
                    parser
                ) {
                    parser.parse();
        
                    var map = new Map("map", {
                        center: [113.707012, 34.766478],
                        zoom: 3
                    });
        
                    var tileInfo = new TileInfo({
                        "dpi": 96,
                        "format": "image/png",
                        "compressionQuality": 0,
                        "spatialReference": new SpatialReference({
                            "wkid": 4326
                        }),
                        "rows": 256,
                        "cols": 256,
                        "origin": {
                            "x": -180,
                            "y": 90
                        },
                        "lods": [{
                            "level": "0","scale": 295829355.45,"resolution": 0.703125
                        }, {
                            "level": "1","scale": 147914677.725,"resolution": 0.3515625
                        }, {
                            "level": "2", "scale": 73957338.8625,"resolution": 0.17578125
                        }, {
                            "level": "3","scale": 36978669.43125,"resolution": 0.087890625
                        }, {
                            "level": "4","scale": 18489334.715625,"resolution": 0.0439453125
                        }, {
                            "level": "5","scale": 9244667.3578125,"resolution": 0.02197265625
                        }, {
                            "level": "6","scale": 4622333.67890625,"resolution": 0.010986328125
                        }, {
                            "level": "7","scale": 2311166.83945312,"resolution": 0.0054931640625
                        }, {
                            "level": "8","scale": 1155583.41972656,"resolution": 0.00274658203125
                        }, {
                            "level": "9","scale": 577791.709863281,"resolution": 0.001373291015625
                        }, {
                            "level": "10","scale": 288895.8549316406,"resolution": 0.0006866455078125
                        }, {
                            "level": "11","scale": 144447.9274658203,"resolution": 0.00034332275390625
                        }, {
                            "level": "12","scale": 4508.935440959931,"resolution": 0.000171661376953125
                        }, {
                            "level": "13","scale": 36111.98186645508,"resolution": 0.0000858306884765625
                        }, {
                            "level": "14","scale": 18055.99093322754,"resolution": 0.0000429153442382812
                        }, {
                            "level": "15","scale": 9027.99546661377,"resolution": 0.0000214576721191406
                        }, {
                            "level": "16","scale": 4513.997733306885,"resolution": 0.0000107288360595703
                        }, {
                            "level": "17","scale": 2256.9988666534423,"resolution": 0.00000536441802978515
                        }, {
                            "level": "18","scale": 1128.4994333267211,"resolution": 0.00000268220901489257
                        }, {
                            "level": "19","scale": 564.2497166633606,"resolution": 0.00000134110450744628
                        }]
                    });
                    var tileExtent = new Extent(-180.0 , -85.0511287798065,180.0 , 85.05112877980648, new SpatialReference({
                        wkid: 4326
                    }));
        
                    var layerInfo = new WMTSLayerInfo({
                        tileInfo: tileInfo,
                        fullExtent: tileExtent,
                        initialExtent: tileExtent,
                        identifier: "China_4326",
                        tileMatrixSet: "ChinaPublicServices_China_4326",
                        format: "png",
                        style: "default"
                    });
        
                    var resourceInfo = {
                        version: "1.0.0",
                        layerInfos: [layerInfo],
                        copyright: "超图预研"
                    };
        
                    var options = {
                        serviceMode: "KVP",
                        resourceInfo: resourceInfo,
                        layerInfo: layerInfo
                    };
                    wmtsLayer = new WMTSLayer("http://www.supermap.com.cn:8090/iserver/services/map-china400/wmts-china", options);
        
                    map.addLayer(wmtsLayer);
                    map.centerAndZoom([113.707012, 34.766478],0);
        
                });
            </script>
        </head>
        <body>
        	<div id="map"></div>
        </body>
    </html>

[watermark_type_ZmFuZ3poZW5naGVpdGk_shadow_10_text_aHR0cHM6Ly9ibG9nLmNzZG4ubmV0L2lkb215d2F5_size_16_color_FFFFFF_t_70]: /images/20210726/a81589c2e3404ad9aa397ffb40ee9bd6.png
[watermark_type_ZmFuZ3poZW5naGVpdGk_shadow_10_text_aHR0cHM6Ly9ibG9nLmNzZG4ubmV0L2lkb215d2F5_size_16_color_FFFFFF_t_70 1]: /images/20210726/d2ec65ba32e148aa81322a022d075cfe.png
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