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:

    SuperMap iClient如何使用WMTS地图服务-LMLPHP

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

    SuperMap iClient如何使用WMTS地图服务-LMLPHP

  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:

      SuperMap iClient如何使用WMTS地图服务-LMLPHP

   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:

        SuperMap iClient如何使用WMTS地图服务-LMLPHP

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

     SuperMap iClient如何使用WMTS地图服务-LMLPHP

  

    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

          SuperMap iClient如何使用WMTS地图服务-LMLPHP    

  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:

        SuperMap iClient如何使用WMTS地图服务-LMLPHP

    

    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)

05-11 11:08