用openlayer加载arcgis发布的wmts图层

1. 通过wmts 确认发布的wmts是什么格式的。格分为wgs84用的是4326，cgc2000用的是4490，xian80用的是4610，下图是4326格式与其对应的分辨率，这块主要是openlayer2.0加载时，需要详细定义。3.0以上的，用proj4js去定义。

下面是4490格式与其对应分辨率

2。对于4490格式，需要在网页里加载proj4js文件：  <script type="text/javascript" src="../libs/proj4js/2.5.0/proj4.js"></script>

    下载proj4.js文件  https://www.bootcdn.cn/proj4js/

    查找坐标系定义  http://epsg.io/, 如查4490

3.   4490 projection定义：

openlayer2:   

 proj4.defs("EPSG:4490","+proj=longlat +ellps=GRS80 +no_defs"); 
 var projection = new OpenLayers.Projection('EPSG:4490');

openlayer 3:

    proj4.defs("EPSG:4490", "+proj=longlat +ellps=GRS80 +no_defs");
    var projection = new ol.proj.get('EPSG:4490');
    projection.setExtent([-180,-90,180,90]);

 

4. 代码实现，下面url中的{Style}与{TileMatrixSet}要被替换
openlayer2中用OpenLayers.Layer.XYZ，建图层：

url = "http://wmtsnetwf.com/services/QQ/WMTS/tile/1.0.0/CQMap_IMG/{Style}/{TileMatrixSet}/${z}/${y}/${z}";

var wmtsXYZ2 = new OpenLayers.Layer.XYZ(
         "wmts",
         url,
         {
        sphericalMercator: false,
        isBaseLayer: false,
        serverResolutions:titleresolutions4490
    });      

openlayer3中或ol.source.XYZ与ol.layer.Tile，建图层：

url = "http://wmtsnetwf.com/services/QQ/WMTS/tile/1.0.0/CQMap_IMG/{Style}/{TileMatrixSet}/{z}/{y}/{z}";

var wmtsSouceXYZ = new ol.source.XYZ({
        attributions: "wmts",
        maxZoom: 18,
        projection: projection,
        tileSize: [256, 256],
        tileUrlFunction: function (tileCoord) {

         var z = tileCoord[0]-1,  x =tileCoord[1], y = -tileCoord[2]-1; //4490
          return url.replace('{z}', (z).toString())
                            .replace('{x}', (x).toString())
                            .replace('{y}', (y).toString());
        }

      })

      var wmtsLayer = new ol.layer.Tile({
        opacity: 0.7,
        source:wmtsSouceXYZ
      });