The east longitude
The east longitude-
In the study area of the east longitude 111 ° - 113.5 °, tin deposits are primary ;
在东经111°-113.5°范围内以锡矿床为主；
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The change range of x for positioning , north latitude , is rather big . And the , east longitude , is steady .
X值（北纬度）变化幅度较大，Y值（东经度）较为稳定；
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The Nanling region tungsten , tin deposits spatial distribution of apparent , In the study area of the east longitude 113.5 ° & 115 °, tungsten deposits are primary ;
研究区钨、锡矿床空间分布规律明显，在东经113.5°-115°范围内，以钨矿床为主；