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中文摘要：
雪峰山隧道群控制网采用一点一方向平差后将4个坐标系纳入一个独立网中，使其没有换带计算，独立网虽控制住线路全线的方向，但由于转换时投影面大地高和中央子午线差异导致投影边长差异的问题。针对以上问题，为了验证雪峰山隧道群独立网能否准确放样出在4个坐标系统中的设计坐标，介绍在雪峰山隧道洞口进行的中线放样与检测试验，通过试验数据分析得出独立控制网能准确放样出中线坐标，从而进一步佐证进行一点一方向平差建立独立控制网的可行性。
英文摘要：
This paper adopts the adjustment principle,which utilizes one point and one direction to put four co-ordinate systems into a independent control netwoek.Through this,it will avoid calculating in different projecting zones.Because of the difference of planes and central meridians,the sides difference in projection is still exist.To solving the problem and verifying whether the independent control network can set out the designed coordinates of four coordinate systems.By introducing the tests of setting out central line and analyzing data,we get the conclu-sion that independent control network can setting out central line exactly.This paper further proving the feasibili-ty of adjusting with one point and one direction.
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Correction of coseismic deformation field associated with Wenchuan earthquake with GPS observables a
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