• SuperMap iClient如何使用WMTS地图服务


    SuperMap iClient如何使用WMTS地图服务

    什么是WMTS服务

           WMTS,切片地图Web服务(Web Map Tile Service)当前版本是1.0.0。该服务符合 OGC(Open Geospatial Consortium,开放地理信息联盟)制定的 WMTS 实现规范。

    WMTS 是 OGC 提出的缓存技术标准,即在服务器端缓存被切割成一定大小瓦片的地图,对客户端只提供这些预先定义好的单个瓦片的服务,将更多的数据处理操作如图层叠加等放在客户端,从而缓解 GIS 服务器端数据处理的压力,改善用户体验。

    如何使用WMTS地图服务

      本文将对iServer的WMTS服务, 天地图的WMTS服务, ArcGIS的WMTS服务进行剖析

    1.针对iServer发布的WMTS服务

      针对iServer Java 6R发布的WMTS,我们在使用iClinet对接时,需要注意以下几个参数,这里我用iClinet for JavaScript代码作为示范:

    layer = new SuperMap.Layer.WMTS({name: "World",

              url: http://localhost:8090/iserver/services/map-world/wmts100   //WMTS服务地址

              layer: "World",  //图层名称

              style: "default",  //图层样式

              matrixSet: "GlobalCRS84Scale_World",  //发布的标识符矩阵集

              format: "image/png", //图像的MIME类型,默认为 "image/png"

              resolutions:resolutions, //地图分辨率

              opacity: 1,

              requestEncoding:"KVP"}); //请求编码 ,一般默认都是KVP

     综合上面红色字体的部分,我们可以得出,如果是iServer发布的地图,除地图url外,我们需要获取以上5个属性,那么究竟如何获取这5个属性呢? 

     获取方法:

      1. 首先,启动iServer6R

      2. 其次浏览器中输入: http://localhost:8090/iserver/services/map-world/wmts100 然后回车

      3. 搜索Contents节点,我们可以获取所需4个属性

    <Contents>

    <Layer>

    <ows:Title>World</ows:Title>

    <ows:Identifier>World</ows:Identifier>

    <ows:WGS84BoundingBox crs="urn:ogc:def:crs:OGC:2:84">

    <ows:LowerCorner>-180.0 -90.0</ows:LowerCorner>

    <ows:UpperCorner>180.0 90.0</ows:UpperCorner>

    </ows:WGS84BoundingBox>

    <ows:BoundingBox crs="urn:ogc:def:crs:EPSG::3857">

    <ows:LowerCorner>-2.0037508342789244E7 -2.0037508342789236E7</ows:LowerCorner>

    <ows:UpperCorner>2.0037508342789244E7 2.0037508342789244E7</ows:UpperCorner>

    </ows:BoundingBox>

    <Style isDefault="true">

    <ows:Identifier>default</ows:Identifier>

    </Style>

    <Format>image/png</Format>

    <TileMatrixSetLink>

    <TileMatrixSet>Custom_World</TileMatrixSet>

    </TileMatrixSetLink>

    <TileMatrixSetLink>

    <TileMatrixSet>GlobalCRS84Scale_World</TileMatrixSet>

    </TileMatrixSetLink>

    <TileMatrixSetLink>

    <TileMatrixSet>GoogleMapsCompatible_World</TileMatrixSet>

    </TileMatrixSetLink>

    <ResourceURL format="image/png"

    resourceType="tile" template="http://localhost:8090/iserver/services/map-world/wmts100/

    World/default/Custom_World/{TileMatrix}/{TileRow}/{TileCol}.png"/>

    <ResourceURL format="image/png"

    resourceType="tile" template="http://localhost:8090/iserver/services/map-world/wmts100/

    World/default/GlobalCRS84Scale_World/{TileMatrix}/{TileRow}/{TileCol}.png"/>

    <ResourceURL format="image/png"

    resourceType="tile" template="http://localhost:8090/iserver/services/map-world/wmts100/

    World/default/GoogleMapsCompatible_World/{TileMatrix}/{TileRow}/{TileCol}.png"/>

    </Layer>

    从高亮的部分,可以得出以下对应情况

    WMTS服务参数

    iClinet for JavaScript代码

    <ows:Title>World</ows:Title>

    layer: "World"

    <ows:Identifier>default</ows:Identifier>

    style: "default"

    <TileMatrixSet>GlobalCRS84Scale_World</TileMatrixSet>

    matrixSet: "GlobalCRS84Scale_World"

    format="image/png"

    format: "image/png"

    4. 最后在根据自己地图,计算当前图层的分辨率数组信息.如本范例分辨率数组是:

     var resolutions = [1.25764139776733,0.628820698883665,0.251528279553466,

                    0.125764139776733,0.0628820698883665,0.0251528279553466,

                    0.0125764139776733,0.00628820698883665,0.00251528279553466,

                    0.00125764139776733,0.000628820698883665,0.000251528279553466,

                    0.000125764139776733,0.0000628820698883665,0.0000251528279553466,

                    0.0000125764139776733, 0.00000628820698883665,0.00000251528279553466,

                    0.00000125764139776733,0.000000628820698883665,0.000000251528279553466];

     最终效果图:

         

    2.针对天地图官网发布的WMTS服务

      针对天地图官网发布的WMTS服务,我们在使用iClinet对接时,需要注意以下几个参数,这里我用iClinet for JavaScript代码作为示范:

      1. 天地图官网公布的WMTS服务地址,请查看http://www.tianditu.cn/guide/index.html

         

      2. 我选取http://t0.tianditu.com/vec_c/wmts为服务地址, 搜索Contents节点,获取4个重要信息:

    <Contents>

    <Layer>

    <ows:Title>cva</ows:Title>

    <ows:Abstract>cva</ows:Abstract>

    <ows:Identifier>cva</ows:Identifier>

    <ows:WGS84BoundingBox>

    <ows:LowerCorner>-180.0 -90.0</ows:LowerCorner>

    <ows:UpperCorner>180.0 90.0</ows:UpperCorner>

    </ows:WGS84BoundingBox>

    <ows:BoundingBox>

    <ows:LowerCorner>-180.0 -90.0</ows:LowerCorner>

    <ows:UpperCorner>180.0 90.0</ows:UpperCorner>

    </ows:BoundingBox>

    <Style>

    <ows:Identifier>default</ows:Identifier>

    </Style>

    <Format>tiles</Format>

    <TileMatrixSetLink>

    <TileMatrixSet>c</TileMatrixSet>

    </TileMatrixSetLink>

    </Layer>

    <TileMatrixSet>

    <ows:Identifier>c</ows:Identifier>

    <ows:SupportedCRS>urn:ogc:def:crs:EPSG::4490</ows:SupportedCRS>

        

    从高亮的部分,可以得出以下对应情况

    天地图官网WMTS服务参数

    iClinet for JavaScript代码

    <ows:Title>cva</ows:Title>

    layer: "vec"

    <ows:Identifier>default</ows:Identifier>

    style: "default"

    <TileMatrixSet>c</TileMatrixSet>

    matrixSet: "c"

    <Format>tiles</Format>

    format: "tiles"

         由于此天地图官网提供的WMTS服务,为全球经纬度范围(东西经±180度,南北纬±90度),则不需要设置原点和全副范围.

      那么在iClinet for JavaScript代码中可以这样写:

    layer = new SuperMap.Layer.WMTS({name: "vec",

                    url: "http://t0.tianditu.com/vec_c/wmts",

                    layer: "vec",

                    style: "default",

                    matrixSet: "c",

                    format: "tiles",

                    opacity: 1,

                    requestEncoding:"KVP"});

      最终效果图:

          

       当然如果再叠加一幅中文标记wmts地图(该步骤同上述步骤相似,请开发人员自己尝试),最终效果:

              

    3.针对ArcGIS发布的WMTS服务

      针对ArcGIS发布的WMTS,我们在使用iClinet对接时,需要注意以下几个参数,这里我用iClinet for JavaScript代码作为示范:

         1. 使用ArcGIS发布地图服务,切缓存 (此步骤略) 出图正常

         

      

        2. 得到ArcGIS的WMTS服务地址, (http://localhost:6080/arcgis/rest/services/china/MapServer/wmts)搜索Contents节点,获取6个重要信息: 

    <Contents>

    <!-- Layer -->

    <Layer>

    <ows:Title>china</ows:Title>

    <ows:Identifier>china</ows:Identifier>

    <ows:BoundingBox crs="urn:ogc:def:crs:EPSG::0">

    <ows:LowerCorner>73.62004852294922 3.8537260781998635</ows:LowerCorner>

    <ows:UpperCorner>134.76846313476562 53.553741455078125</ows:UpperCorner>

    </ows:BoundingBox>

    <ows:WGS84BoundingBox crs="urn:ogc:def:crs:OGC:2:84">

    <ows:LowerCorner>73.62004852294922 3.8537260781998635</ows:LowerCorner>

    <ows:UpperCorner>134.76846313476562 53.553741455078125</ows:UpperCorner>

    </ows:WGS84BoundingBox>

    <Style isDefault="true">

    <ows:Title>Default Style</ows:Title>

    <ows:Identifier>default</ows:Identifier>

    </Style>

    <Format>image/png</Format>

    <TileMatrixSetLink>

    <TileMatrixSet>default028mm</TileMatrixSet>

    </TileMatrixSetLink>

    <TileMatrixSetLink>

    <TileMatrixSet>nativeTileMatrixSet</TileMatrixSet>

    </TileMatrixSetLink>

    <ResourceURL

    format="image/png"

    resourceType="tile" template="http://localhost:6080/arcgis/rest/services/china/MapServer/WMTS

    /tile/1.0.0/china/{Style}/{TileMatrixSet}/{TileMatrix}/{TileRow}/{TileCol}.png"/>

    </Layer>

    以及矩阵原点属性

    <TileMatrix>

    <ows:Identifier>0</ows:Identifier>

    <ScaleDenominator>6.047619047619047E7</ScaleDenominator>

    <TopLeftCorner>-400.0 400.0</TopLeftCorner>

    <TileWidth>256</TileWidth>

    <TileHeight>256</TileHeight>

    <MatrixWidth>2</MatrixWidth>

    <MatrixHeight>3</MatrixHeight>

      从高亮的部分,可以得出以下对应情况

    ArcGIS WMTS服务参数

    iClinet for JavaScript代码

    <ows:Title>china</ows:Title>

    layer: "china"

     

    <ows:Identifier>default</ows:Identifier>

     

    style: "default"

    <TileMatrixSet>default028mm</TileMatrixSet>

    matrixSet: "default028mm"

    <Format>image/png</Format>

    format: "image/png"

    <ows:LowerCorner>73.62004852294922 3.8537260781998635</ows:LowerCorner>

    <ows:UpperCorner>134.76846313476562 53.553741455078125</ows:UpperCorner>

    tileFullExtent: new SuperMap.Bounds(

    73.62004852294922,

    3.8537260781998635,

    134.76846313476562,

    53.553741455078125)

     

    <TopLeftCorner>-400.0 400.0</TopLeftCorner>

    tileOrigin:new SuperMap.LonLat(-400,400)

      3. 获取ArcGIS所切图层的分辨率,访问地图rest服务(http://localhost:6080/arcgis/rest/services/china/MapServer )我们可以获取resolutions

                  

      那么在iClinet for JavaScript中完整代码可以这样写

    var resolutions = [0.15228550437351568,0.07614275218675784,0.03807137609337892,0.01903568804668946,0.00951784402334473]; //分辨率

    var maxExtent = new SuperMap.Bounds(73.62004852294922,3.8537260781998635,134.76846313476562,53.553741455078125); //全副范围

    layer = new SuperMap.Layer.WMTS({name: "china",

        url: "http://localhost:6080/arcgis/rest/services/china/MapServer/wmts"

        layer: "china",

        style: "default",

        matrixSet: "default028mm",

        format: "image/png",

        resolutions:resolutions,

        opacity: 1,

        tileFullExtent:maxExtent,     //瓦片设置的最大范围

        tileOrigin:new SuperMap.LonLat(-400,400),   //瓦片矩阵左上角

        requestEncoding:"KVP"

       });

      最终效果图:

            

        

        注意:在对接ArcGIS wmts服务时:

          1. 需要设置瓦片设置的最大范围(全副范围)

          2. 需要设置瓦片矩阵左上角 (如果不出图,有时候需要根据请求瓦片行列号,微调这个值)

          3. 需要设置分辨率

         (转贴请注明出处:http://www.cnblogs.com/zhangyongli2011/    如发现有错,请留言 谢谢)

     

     

     

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  • 原文地址:https://www.cnblogs.com/zhangyongli2011/p/3239802.html
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