综述：本节讲述的是用Arcgis for js加载天地图的切片资源。
天地图的切片地图可以通过esri.layers.TiledMapServiceLayer来加载，在此将之进行了一定的封装，如下：
1、切片线划图——TDTLayer.js
define(["dojo/_base/declare","esri/layers/tiled"],function (declare) {return declare(esri.layers.TiledMapServiceLayer, {constructor: function () {this.spatialReference = new esri.SpatialReference({ wkid: 4326 });this.initialExtent = (this.fullExtent = new esri.geometry.Extent(-180.0, -90.0, 180.0, 90.0, this.spatialReference));this.tileInfo = new esri.layers.TileInfo({"rows": 256,"cols": 256,"compressionQuality": 0,"origin": {"x": -180,"y": 90},"spatialReference": {"wkid": 4326},"lods": [{ "level": 2, "resolution": 0.3515625, "scale": 147748796.52937502 },{ "level": 3, "resolution": 0.17578125, "scale": 73874398.264687508 },{ "level": 4, "resolution": 0.087890625, "scale": 36937199.132343754 },{ "level": 5, "resolution": 0.0439453125, "scale": 18468599.566171877 },{ "level": 6, "resolution": 0.02197265625, "scale": 9234299.7830859385 },{ "level": 7, "resolution": 0.010986328125, "scale": 4617149.8915429693 },{ "level": 8, "resolution": 0.0054931640625, "scale": 2308574.9457714846 },{ "level": 9, "resolution": 0.00274658203125, "scale": 1154287.4728857423 },{ "level": 10, "resolution": 0.001373291015625, "scale": 577143.73644287116 },{ "level": 11, "resolution": 0.0006866455078125, "scale": 288571.86822143558 },{ "level": 12, "resolution": 0.00034332275390625, "scale": 144285.93411071779 },{ "level": 13, "resolution": 0.000171661376953125, "scale": 72142.967055358895 },{ "level": 14, "resolution": 8.58306884765625e-005, "scale": 36071.483527679447 },{ "level": 15, "resolution": 4.291534423828125e-005, "scale": 18035.741763839724 },{ "level": 16, "resolution": 2.1457672119140625e-005, "scale": 9017.8708819198619 },{ "level": 17, "resolution": 1.0728836059570313e-005, "scale": 4508.9354409599309 },{ "level": 18, "resolution": 5.3644180297851563e-006, "scale": 2254.4677204799655 }]});this.loaded = true;this.onLoad(this);},getTileUrl: function (level, row, col) {return "" + col % 8 + ".tianditu.cn/vec_c/wmts?SERVICE=WMTS&REQUEST=GetTile&VERSION=1.0.0&LAYER=vec&STYLE=default&TILEMATRIXSET=c&TILEMATRIX=" + level + "&TILEROW=" + row + "&TILECOL=" + col + "&FORMAT=tiles";}});});2、切片标注——TDTAnnoLayer.jsdefine(["dojo/_base/declare","esri/layers/tiled"],function (declare) {return declare(esri.layers.TiledMapServiceLayer, {constructor: function () {this.spatialReference = new esri.SpatialReference({ wkid: 4326 });this.initialExtent = (this.fullExtent = new esri.geometry.Extent(-180.0, -90.0, 180.0, 90.0, this.spatialReference));this.tileInfo = new esri.layers.TileInfo({"rows": 256,"cols": 256,"compressionQuality": 0,"origin": {"x": -180,"y": 90},"spatialReference": {"wkid": 4326},"lods": [{ "level": 2, "resolution": 0.3515625, "scale": 147748796.52937502 },{ "level": 3, "resolution": 0.17578125, "scale": 73874398.264687508 },{ "level": 4, "resolution": 0.087890625, "scale": 36937199.132343754 },{ "level": 5, "resolution": 0.0439453125, "scale": 18468599.566171877 },{ "level": 6, "resolution": 0.02197265625, "scale": 9234299.7830859385 },{ "level": 7, "resolution": 0.010986328125, "scale": 4617149.8915429693 },{ "level": 8, "resolution": 0.0054931640625, "scale": 2308574.9457714846 },{ "level": 9, "resolution": 0.00274658203125, "scale": 1154287.4728857423 },{ "level": 10, "resolution": 0.001373291015625, "scale": 577143.73644287116 },{ "level": 11, "resolution": 0.0006866455078125, "scale": 288571.86822143558 },{ "level": 12, "resolution": 0.00034332275390625, "scale": 144285.93411071779 },{ "level": 13, "resolution": 0.000171661376953125, "scale": 72142.967055358895 },{ "level": 14, "resolution": 8.58306884765625e-005, "scale": 36071.483527679447 },{ "level": 15, "resolution": 4.291534423828125e-005, "scale": 18035.741763839724 },{ "level": 16, "resolution": 2.1457672119140625e-005, "scale": 9017.8708819198619 },{ "level": 17, "resolution": 1.0728836059570313e-005, "scale": 4508.9354409599309 },{ "level": 18, "resolution": 5.3644180297851563e-006, "scale": 2254.4677204799655 }]});this.loaded = true;this.onLoad(this);},getTileUrl: function (level, row, col) {return "" + row % 8 + ".tianditu.cn/cva_c/wmts?SERVICE=WMTS&REQUEST=GetTile&VERSION=1.0.0&LAYER=cva&STYLE=default&TILEMATRIXSET=c&TILEMATRIX=" + level + "&TILEROW=" + row + "&TILECOL=" + col + "&FORMAT=tiles";}});});封装好之后就可以在页面调用了，调用的时候需要导入这些自定义的图层，，导入方式为： <script type="text/javascript">dojoConfig = {parseOnLoad: true,packages: [{name: 'tdlib',location: this.location.pathname.replace(/\/[^/]+$/, "")+"/js/tdlib"}]};</script><script src=""></script><script>require(["tdlib/TDTLayer","tdlib/TDTAnnoLayer"],function (TDTLayer,TDTAnnoLayer){var basemap = new TDTLayer();map.addLayer(basemap);var annolayer = new TDTAnnoLayer();map.addLayer(annolayer);});</script>带上心灵去旅行，以平和的心态看待一切，
