arcgis javascript api4.x以basetilelayer方式加载arcgis发布的栅格切片服务

发布时间：2024年01月15日

需求：

以arcgis js api的basetilelayer加载arcgis发布的栅格切片服务

效果图：

其中和tileinfo和lods，这样获取：

https://map.geoq.cn/arcgis/rest/services/ChinaOnlineCommunity/MapServer/?f=pjson

urltemplate：

这样获取

https://map.geoq.cn/arcgis/rest/services/ChinaOnlineCommunity/MapServer/WMTS/1.0.0/WMTSCapabilities.xml

?

先确保以一张为例有结果返回

https://map.geoq.cn/arcgis/rest/services/ChinaOnlineCommunity/MapServer/WMTS/tile/1.0.0/ChinaOnlineCommunity/default/default028mm/14/6730/13396.png

代码：

<!DOCTYPE html>
<html>
  <head>
    <meta charset="utf-8" />
    <meta
      name="viewport"
      content="initial-scale=1, maximum-scale=1, user-scalable=no"
    />
    <title>以basetilelayer加载切片服务</title>
    <style>
      html,
      body,
      #viewDiv {
        padding: 0;
        margin: 0;
        height: 100%;
        width: 100%;
      }
    </style>

    <link
      rel="stylesheet"
      href="https://js.arcgisonline.cn/4.25/esri/css/main.css"
    />
    <script src="https://js.arcgisonline.cn/4.25/init.js"></script>

    <script>
      require([
        "esri/Map",
        "esri/views/MapView",
        "esri/layers/BaseTileLayer",
        "esri/layers/support/TileInfo",
        "esri/geometry/SpatialReference",
        "esri/geometry/Extent",
        "esri/config",
        "esri/request",
        "esri/layers/FeatureLayer",
      ], function (
        Map,
        MapView,
        BaseTileLayer,
        TileInfo,
        SpatialReference,
        Extent,
        esriConfig,
        esriRequest,
        FeatureLayer
      ) {
        var tileInfo = new TileInfo({
          rows: 256,
          cols: 256,
          dpi: 96,
          format: "PNG",
          compressionQuality: 0,
          origin: {
            x: -2.0037508342787e7,
            y: 2.0037508342787e7,
          },
          spatialReference: {
            wkid: 102100,
            latestWkid: 3857,
          },
          lods: [
            {
              level: 0,
              resolution: 156543.03392800014,
              scale: 5.91657527591555e8,
            },
            {
              level: 1,
              resolution: 78271.51696399994,
              scale: 2.95828763795777e8,
            },
            {
              level: 2,
              resolution: 39135.75848200009,
              scale: 1.47914381897889e8,
            },
            {
              level: 3,
              resolution: 19567.87924099992,
              scale: 7.3957190948944e7,
            },
            {
              level: 4,
              resolution: 9783.93962049996,
              scale: 3.6978595474472e7,
            },
            {
              level: 5,
              resolution: 4891.96981024998,
              scale: 1.8489297737236e7,
            },
            {
              level: 6,
              resolution: 2445.98490512499,
              scale: 9244648.868618,
            },
            {
              level: 7,
              resolution: 1222.992452562495,
              scale: 4622324.434309,
            },
            {
              level: 8,
              resolution: 611.4962262813797,
              scale: 2311162.217155,
            },
            {
              level: 9,
              resolution: 305.74811314055756,
              scale: 1155581.108577,
            },
            {
              level: 10,
              resolution: 152.87405657041106,
              scale: 577790.554289,
            },
            {
              level: 11,
              resolution: 76.43702828507324,
              scale: 288895.277144,
            },
            {
              level: 12,
              resolution: 38.21851414253662,
              scale: 144447.638572,
            },
            {
              level: 13,
              resolution: 19.10925707126831,
              scale: 72223.819286,
            },
            {
              level: 14,
              resolution: 9.554628535634155,
              scale: 36111.909643,
            },
            {
              level: 15,
              resolution: 4.77731426794937,
              scale: 18055.954822,
            },
            {
              level: 16,
              resolution: 2.388657133974685,
              scale: 9027.977411,
            },
            {
              level: 17,
              resolution: 1.1943285668550503,
              scale: 4513.988705,
            },
            {
              level: 18,
              resolution: 0.5971642835598172,
              scale: 2256.994353,
            },
            {
              level: 19,
              resolution: 0.29858214164761665,
              scale: 1128.497176,
            },
          ],
        });

        var tileExtent = new Extent({
          xmin: -2.0037507067161843e7,
          ymin: -3.0240971958386254e7,
          xmax: 2.0037507067161843e7,
          ymax: 3.0240971958386205e7,
          spatialReference: {
            wkid: 102100,
          },
        });
        var MyCustomTileLayer = BaseTileLayer.createSubclass({
          properties: {
            urlTemplate: null,
          },
          getTileUrl: function (level, row, col) {
            return this.urlTemplate
              .replace("{z}", level)
              .replace("{x}", col)
              .replace("{y}", row);
          },
          fetchTile: function (level, row, col, options) {
            var url = this.getTileUrl(level, row, col);
            return esriRequest(url, {
              responseType: "image",
              allowImageDataAccess: true,
            }).then(
              function (response) {
                var image = response.data;
                var width = this.tileInfo.size[0];
                var height = this.tileInfo.size[0];
                var canvas = document.createElement("canvas");
                var context = canvas.getContext("2d");
                canvas.width = width;
                canvas.height = height;
                if (this.tint) {
                  context.fillStyle = this.tint.toCss();
                  context.fillRect(0, 0, width, height);
                  context.globalCompositeOperation = "difference";
                }
                context.drawImage(image, 0, 0, width, height);
                return canvas;
              }.bind(this)
            );
          },
        });

        var mylayer = new MyCustomTileLayer({
          urlTemplate:
            "https://map.geoq.cn/arcgis/rest/services/ChinaOnlineCommunity/MapServer/WMTS/tile/1.0.0/ChinaOnlineCommunity/default/default028mm/{z}/{y}/{x}.png",

          tileInfo: tileInfo,
        });

        var map = new Map({
          spatialReference: new SpatialReference({ wkid: 3857 }),
          basemap: {
            baseLayers: [mylayer],
          },
        });

        var view = new MapView({
          container: "viewDiv",
          map: map,
          extent: tileExtent,         
          spatialReference: new SpatialReference({ wkid: 3857 }),
        });
      });
    </script>
  </head>

  <body>
    <div id="viewDiv"></div>
  </body>
</html>

文章来源:https://blog.csdn.net/gislaozhang/article/details/135601963
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