ArcGIS.Server.9.2.DotNet使用Google Maps卫星图片数据

目的：

1.arcgis server9.2 ADF中把Google Maps卫星图片作为数据源。

准备工作：

1.本例子是在上一篇的基础上实现的，请参考ArcGIS.Server.9.2.DotNet使用Virtual Earth地图图片数据（自带例子 九、二）

完成后的效果图：

<TileCacheInfos>

2 <TileCacheInfo Name='Google Map'

3 SpatialReference='PROJCS["Sphere_VE_WGS84",GEOGCS["GCS_Sphere_VE_WGS84",

4DATUM["D_Sphere_VE_WGS84",

5SPHEROID["Sphere_VE_WGS84",6378137.0,0.0]],

6PRIMEM["Greenwich",0.0],

7UNIT["Degree",0.0174532925199433]],

8PROJECTION["Mercator"],

9PARAMETER["False_Easting",0.0],

10PARAMETER["False_Northing",0.0],

11PARAMETER["Central_Meridian",0.0],

12PARAMETER["Standard_Parallel_1",0.0],

13UNIT["Meter",1.0]]'

14 DPI='96'

15 Width='256' Height='256' TileOrigin='-20037508.3427892,20037508.3427892'>

16 <FullExtent XMin='-20037508.3427892' YMin='-20037508.3427892' XMax='20037508.3427892' YMax='20037508.3427892'/>

17 <DefaultExtent XMin='-20037508.3427892' YMin='-20037508.3427892' XMax='20037508.3427892' YMax='20037508.3427892'/>

18 <Layers>

19 </Layers>

20 <TileUrlGenerator type='class' Assembly='TiledMapDataSource' Class='TiledMapDataSource.GoogleMapTileUrlGenerator' />

21 <LodInfos>

22 <LodInfo LevelID='1' Resolution='78271.5170' Scale='295829355.45' Rows='2' Columns='2' TileExtentWidth='20037508.3427892' TileExtentHeight='20037508.3427893' TileUrl='' />

23 <LodInfo LevelID='2' Resolution='39135.7585' Scale='147914677.73' Rows='4' Columns='4' TileExtentWidth='10018754.1713946' TileExtentHeight='10018754.1713947' TileUrl='' />

24 <LodInfo LevelID='3' Resolution='19567.8792' Scale='73957338.86' Rows='8' Columns='8' TileExtentWidth='5009377.08569731' TileExtentHeight='5009377.08569736' TileUrl='' />

25 <LodInfo LevelID='4' Resolution='9783.9396' Scale='36978669.43' Rows='16' Columns='16' TileExtentWidth='2504688.54284865' TileExtentHeight='2504688.54284866' TileUrl='' />

26 <LodInfo LevelID='5' Resolution='4891.9698' Scale='18489334.72' Rows='32' Columns='32' TileExtentWidth='1252344.27142432' TileExtentHeight='1252344.27142439' TileUrl='' />

27 <LodInfo LevelID='6' Resolution='2445.9849' Scale='9244667.36' Rows='64' Columns='64' TileExtentWidth='626172.135712165' TileExtentHeight='626172.135712203' TileUrl='' />

28 <LodInfo LevelID='7' Resolution='1222.9925' Scale='4622333.68' Rows='128' Columns='128' TileExtentWidth='313086.067856081' TileExtentHeight='313086.067856163' TileUrl='' />

29 <LodInfo LevelID='8' Resolution='611.4962' Scale='2311166.84' Rows='256' Columns='256' TileExtentWidth='156543.03392804' TileExtentHeight='156543.033928085' TileUrl='' />

30 <LodInfo LevelID='9' Resolution='305.7481' Scale='1155583.42' Rows='512' Columns='512' TileExtentWidth='78271.5169640221' TileExtentHeight='78271.5169640593' TileUrl='' />

31 <LodInfo LevelID='10' Resolution='152.8741' Scale='577791.71' Rows='1024' Columns='1024' TileExtentWidth='39135.7584820092' TileExtentHeight='39135.7584820762' TileUrl='' />

32 <LodInfo LevelID='11' Resolution='76.4370' Scale='288895.85' Rows='2048' Columns='2048' TileExtentWidth='19567.8792410046' TileExtentHeight='19567.8792410083' TileUrl='' />

33 <LodInfo LevelID='12' Resolution='38.2185' Scale='144447.93' Rows='4096' Columns='4096' TileExtentWidth='9783.93962049857' TileExtentHeight='9783.93962051347' TileUrl='' />

34 <LodInfo LevelID='13' Resolution='19.1093' Scale='72223.96' Rows='8192' Columns='8192' TileExtentWidth='4891.96981025115' TileExtentHeight='4891.96981034055' TileUrl='' />

35 <LodInfo LevelID='14' Resolution='9.5546' Scale='36111.98' Rows='16384' Columns='16384' TileExtentWidth='2445.98490512371' TileExtentHeight='2445.98490521312' TileUrl='' />

36 <LodInfo LevelID='15' Resolution='4.7773' Scale='18055.99' Rows='32768' Columns='32768' TileExtentWidth='1222.99245255813' TileExtentHeight='1222.99245259538' TileUrl='' />

37 <LodInfo LevelID='16' Resolution='2.3887' Scale='9027.0' Rows='65536' Columns='65536' TileExtentWidth='611.496226280928' TileExtentHeight='611.496226321906' TileUrl='' />

38 <LodInfo LevelID='17' Resolution='1.1943' Scale='4513.0' Rows='131072' Columns='131072' TileExtentWidth='305.748113140464' TileExtentHeight='305.748113185167' TileUrl='' />

39 <LodInfo LevelID='18' Resolution='0.5971' Scale='2254.4' Rows='262144' Columns='262144' TileExtentWidth='152.702993744053' TileExtentHeight='152.702993744053' TileUrl= '' />

40 <LodInfo LevelID='19' Resolution='0.29858' Scale='1127.2' Rows='524288' Columns='524288' TileExtentWidth='76.3514968720267' TileExtentHeight='76.3514968720267' TileUrl= '' />

41

42 </LodInfos>

43 </TileCacheInfo>

44</TileCacheInfos>
4.接下来还需要实现一个GoogleMapTileUrlGenerator类作为GoogleMap的图片地址生成类，同上例的VirtualEarthTileUrlGenerator类一样需要实现ITileUrlGenerator接口，具体代码如下：
1namespace TiledMapDataSource

2{

3{

5{

9{

17{

25{

28{

32{

36 cell += 2;

37 }

38 quad += cell;

39 }

40 quad = quad.Replace("0", "q");

41 quad = quad.Replace("1", "r");

42 quad = quad.Replace("2", "t");

43 quad = quad.Replace("3", "s");

44 return quad;

45 }

46 }

47}
5.上面的GoogleMapTileUrlGenerator类中的TileToQuadKey方法就是来实现图片名称编码的计算，这个方法是采用了VirtualEarthTileUrlGenerator中的方法，具体不同的部分就是最后做了一下简单的字符替换，可以这样做的原因是Virtual Earth和Google Maps的图片名称编码是一样的，如同一个位置的图片路径，Virtual Earth：http://h0.ortho.tiles.virtualearth.net/tiles/a1302.jpeg?g=1 ；Google Maps:http://kh.google.com/kh?v=3&t=trsqt ,只是代表的字符不同而已，0=q;1=r;2=t;3=s。

6.接着在Default_TileMapData.aspx中的MapResourceManager1控件的DataSourceDefinition的路径改成GoogleMap.xml的路径，就可以运行查看效果了。

7. 完成后才发现Google Maps好像不允许这样方式取地图图片了经常会几率很高的取不到地图图片，而Virtual Earth没有这个问题了，看来还是google小气了一把了。

google maps取图时经常需要输入验证码，这样做的目的防止程序取了！！！