[求助]怎样使在网上下的地图恢复成多个图层呀

<P>哥哥姐姐：</P>
<P>  兄弟是新手，在网上下载的地图是成型的，就一个图层，请问怎样才能将它恢复成多个图层呀</P><img src="images/post/smile/dvbbs/em12.gif" /><img src="images/post/smile/dvbbs/em12.gif" /><img src="images/post/smile/dvbbs/em12.gif" /><img src="images/post/smile/dvbbs/em12.gif" /><img src="images/post/smile/dvbbs/em02.gif" /><img src="images/post/smile/dvbbs/em02.gif" />