Identytask

参数说明
http://resources.esri.com/help/9.3/arcgisserver/apis/rest/index.html?lengths.html
geometry type:point
geometry: 100.72265625,28.393968485169495
layers:0(省界图层为0,盆地为1,如果图层不同,要在不同的tolerance下才能查到相关信息)
tolerance:1
map extent: -126.2109375,-23.285719014830505,126.2109375,102.2220934851695(和随时的放大缩小有关系,不一定是开始设定的map定值)
image display: 1436,714,96(weidth,height和屏幕分辨率基本一致,dpi?)
能够得到geometry,即返回的polygon.
图层1, tolerance:5

-110.3466796875,27.6953125,-47.2412109375,59.072265625
1436,714,96

-74.9852146530307,44.6681301472363

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