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<P>要明确两个概念：Geographic coordinate system和projected coordinate system的区别。1、首先理解Geographic coordinate system，Geographic coordinate system...全文
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navycaptain：谢谢!<img src="images/post/smile/dvbbs/em02.gif" />(2004-09-02 10:54)
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chenbin_sc：感谢<img src="http://www.gisempire.com/bbs/Skins/Default/emot/em01.gif"><img src="http://www.gisempire.com/bbs/Skins/D...(2004-08-22 21:13)
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dsea：谢谢为我们普及基础知识，感谢，收获不少(2004-08-22 14:59)
