PostGIS+postgresql建立坐标位置计算

http://blog.csdn.net/gyfang/article/details/11661575

http://www.cnblogs.com/wuhenke/archive/2010/08/02/1790747.html

http://www.v2ex.com/t/163607

http://my.oschina.net/weiwubunengxiao/blog/100576?

http://www.server110.com/postgresql/201312/4006.html

http://my.oschina.net/weiwubunengxiao/blog/100576?fromerr=WTAGgCOs