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本篇主要介绍利用ArcGIS API for Javascript最新版本3.23加载谷歌地图和谷歌影像，以加载谷歌地图为例，方法即通过TiledMapServiceLayer来自定义谷歌地图图层模块。
1、谷歌地图加载效果
【谷歌地图】
【谷歌影像】
2、定义类——谷歌图层GoogleMapLayer
define(["dojo/_base/declare", "esri/layers/TiledMapServiceLayer", "esri/geometry/Extent", "esri/SpatialReference", "esri/layers/TileInfo"],
function (declare, TiledMapServiceLayer, Extent, SpatialReference, TileInfo) {
return declare(TiledMapServiceLayer, {
// 构造函数
constructor: function (properties) {
// 这里使用坐标系为投影坐标系WGS_1984_Web_Mercator（wkid: 102113）
this.spatialReference = new SpatialReference({
wkid:102113
});
// 图层提供的起始显示范围以及整个图层的地理范围
this.fullExtent = new Extent(-20037508.342787, -20037508.342787, 20037508.342787, 20037508.342787, this.spatialReference);
this.initialExtent = new Extent(5916776.8, 1877209.3, 19242502.6, 7620381.8, this.spatialReference);
// 图层提供的切片信息
this.tileInfo = new TileInfo({
"rows": 256,
"cols": 256,
"compressionQuality": 0,
"origin": {
"x": -20037508.342787,
"y": 20037508.342787
},
"spatialReference": {
"wkid": 102113
},
"lods": [
{ "level": 0, "resolution": 156543.033928, "scale": 591657527.591555 },
{ "level": 1, "resolution": 78271.5169639999, "scale": 295828763.795777 },
{ "level": 2, "resolution": 39135.7584820001, "scale": 147914381.897889 },
{ "level": 3, "resolution": 19567.8792409999, "scale": 73957190.948944 },
{ "level": 4, "resolution": 9783.93962049996, "scale": 36978595.474472 },
{ "level": 5, "resolution": 4891.96981024998, "scale": 18489297.737236 },
{ "level": 6, "resolution": 2445.98490512499, "scale": 9244648.868618 },
{ "level": 7, "resolution": 1222.99245256249, "scale": 4622324.434309 },
{ "level": 8, "resolution": 611.49622628138, "scale": 2311162.217155 },
{ "level": 9, "resolution": 305.748113140558, "scale": 1155581.108577 },
{ "level": 10, "resolution": 152.874056570411, "scale": 577790.554289 },
{ "level": 11, "resolution": 76.4370282850732, "scale": 288895.277144 },
{ "level": 12, "resolution": 38.2185141425366, "scale": 144447.638572 },
{ "level": 13, "resolution": 19.1092570712683, "scale": 72223.819286 },
{ "level": 14, "resolution": 9.55462853563415, "scale": 36111.909643 },
{ "level": 15, "resolution": 4.77731426794937, "scale": 18055.954822 },
{ "level": 16, "resolution": 2.38865713397468, "scale": 9027.977411 },
{ "level": 17, "resolution": 1.19432856685505, "scale": 4513.988705 },
{ "level": 18, "resolution": 0.597164283559817, "scale": 2256.994353 },
{ "level": 19, "resolution": 0.298582141647617, "scale": 1128.497176 }
]
});
// 设置图层的loaded属性，并触发onLoad事件
this.loaded = true;
this.onLoad(this);
},
getTileUrl: function (level, row, col) {
var zoom = level - 1;
var offsetX = Math.pow(2, zoom);
var offsetY = offsetX - 1;
var numX = col - offsetX;
var numY = (-row) + offsetY;
zoom = level + 1;
var num = (col + row) % 8 + 1;
var url = "http://mt" + (col % 4) + ".google.cn/vt/lyrs=m@226000000&hl=zh-CN&gl=cn&x=" + col + "&y=" + row + "&z=" + level + "&s=Gali";
return url;
}
});
}
)
3、加载谷歌图层并显示
<script>
var map;
require([
"esri/map",
"src/GoogleMapLayer",
"dojo/parser",
"dojo/domReady!"],
function(Map,GoogleMapLayer,parser) {
parser.parse();
map = new Map("map", {
logo: false,
center: [107.9, 34.7],
zoom: 4
});
var googlelayer = new GoogleMapLayer();
map.addLayer(googlelayer);
});
</script>
4、源码下载
下载地址：ArcGIS API for Javascript3.23加载谷歌地图
源码包括谷歌地图、影像图（加标注）自定义文件(src/*.js)和图层加载显示文件（.html），ArcGIS API for JavaScript使用的是当前最新版本【3.23】。
