SuperMap iClient如何使用WMTS地圖服務
什么是WMTS服務
WMTS,切片地圖Web服務(Web Map Tile Service)當前版本是1.0.0。該服務符合 OGC(Open Geospatial Consortium,開放地理信息聯盟)制定的 WMTS 實現規范。
WMTS 是 OGC 提出的緩存技術標准,即在服務器端緩存被切割成一定大小瓦片的地圖,對客戶端只提供這些預先定義好的單個瓦片的服務,將更多的數據處理操作如圖層疊加等放在客戶端,從而緩解 GIS 服務器端數據處理的壓力,改善用戶體驗。
如何使用WMTS地圖服務
本文將對iServer的WMTS服務, 天地圖的WMTS服務, ArcGIS的WMTS服務進行剖析
1.針對iServer發布的WMTS服務
針對iServer Java 6R發布的WMTS,我們在使用iClinet對接時,需要注意以下幾個參數,這里我用iClinet for JavaScript代碼作為示范:
layer = new SuperMap.Layer.WMTS({name: "World", url: http://localhost:8090/iserver/services/map-world/wmts100 //WMTS服務地址 layer: "World", //圖層名稱 style: "default", //圖層樣式 matrixSet: "GlobalCRS84Scale_World", //發布的標識符矩陣集 format: "image/png", //圖像的MIME類型,默認為 "image/png" resolutions:resolutions, //地圖分辨率 opacity: 1, requestEncoding:"KVP"}); //請求編碼 ,一般默認都是KVP |
綜合上面紅色字體的部分,我們可以得出,如果是iServer發布的地圖,除地圖url外,我們需要獲取以上5個屬性,那么究竟如何獲取這5個屬性呢?
獲取方法:
1. 首先,啟動iServer6R
2. 其次瀏覽器中輸入: http://localhost:8090/iserver/services/map-world/wmts100 然后回車
3. 搜索Contents節點,我們可以獲取所需4個屬性
<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> |
從高亮的部分,可以得出以下對應情況
WMTS服務參數 |
iClinet for JavaScript代碼 |
<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. 最后在根據自己地圖,計算當前圖層的分辨率數組信息.如本范例分辨率數組是:
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]; |
最終效果圖:
2.針對天地圖官網發布的WMTS服務
針對天地圖官網發布的WMTS服務,我們在使用iClinet對接時,需要注意以下幾個參數,這里我用iClinet for JavaScript代碼作為示范:
1. 天地圖官網公布的WMTS服務地址,請查看http://www.tianditu.cn/guide/index.html
2. 我選取http://t0.tianditu.com/vec_c/wmts為服務地址, 搜索Contents節點,獲取4個重要信息:
<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> |
從高亮的部分,可以得出以下對應情況
天地圖官網WMTS服務參數 |
iClinet for JavaScript代碼 |
<ows:Title>cva</ows:Title> |
layer: "vec" |
<ows:Identifier>default</ows:Identifier> |
style: "default" |
<TileMatrixSet>c</TileMatrixSet> |
matrixSet: "c" |
<Format>tiles</Format> |
format: "tiles" |
由於此天地圖官網提供的WMTS服務,為全球經緯度范圍(東西經±180度,南北緯±90度),則不需要設置原點和全副范圍.
那么在iClinet for JavaScript代碼中可以這樣寫:
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"}); |
最終效果圖:
當然如果再疊加一幅中文標記wmts地圖(該步驟同上述步驟相似,請開發人員自己嘗試),最終效果:
3.針對ArcGIS發布的WMTS服務
針對ArcGIS發布的WMTS,我們在使用iClinet對接時,需要注意以下幾個參數,這里我用iClinet for JavaScript代碼作為示范:
1. 使用ArcGIS發布地圖服務,切緩存 (此步驟略) 出圖正常
2. 得到ArcGIS的WMTS服務地址, (http://localhost:6080/arcgis/rest/services/china/MapServer/wmts)搜索Contents節點,獲取6個重要信息:
<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> 以及矩陣原點屬性 <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> |
從高亮的部分,可以得出以下對應情況
ArcGIS WMTS服務參數 |
iClinet for JavaScript代碼 |
<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. 獲取ArcGIS所切圖層的分辨率,訪問地圖rest服務(http://localhost:6080/arcgis/rest/services/china/MapServer )我們可以獲取resolutions
那么在iClinet for JavaScript中完整代碼可以這樣寫
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); //全副范圍 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, //瓦片設置的最大范圍 tileOrigin:new SuperMap.LonLat(-400,400), //瓦片矩陣左上角 requestEncoding:"KVP" }); |
最終效果圖:
注意:在對接ArcGIS wmts服務時:
1. 需要設置瓦片設置的最大范圍(全副范圍)
2. 需要設置瓦片矩陣左上角 (如果不出圖,有時候需要根據請求瓦片行列號,微調這個值)
3. 需要設置分辨率
(轉貼請注明出處:http://www.cnblogs.com/zhangyongli2011/ 如發現有錯,請留言 謝謝)