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/**
 * [模块]TdtTilesLayer-天地图访问类
 * @module TdtTilesLayer
 */
define(["dojo/_base/declare",
    "esri/layers/tiled"],
    function (declare) {
    /**
   * TdtTilesLayer 构造函数
   * @constructor module:TdtTilesLayer
   * @param {String} maptype  - 图层类型,支持如下类别<br/>
   * img：影像<br/>
   * cia：影像注记<br/>
   * vec：矢量<br>
   * cva：矢量注记
   * @returns {Class} TdtTilesLayer
   * @example
   * //天地图影像图
   * baseMap = new TdtTilesLayer("img");
   * @example
   * //天地图影像注记图
   * baseMap = new TdtTilesLayer("cia");
   * @example
   * //天地图矢量图
   *  baseMap = new TdtTilesLayer("vec");
   *  @example
   *  //天地图矢量注记图
   *  baseMap = new TdtTilesLayer("cva");
 */
        var exports = declare(esri.layers.TiledMapServiceLayer, {
            _maptype: "",
            _tk: "0ae1a281455bf9d462c75b83602e39a3",
            constructor: function (maptype) {
                this.

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