Length projection deformation is easy to overrun in line control measurement of Tibetan basin.How to control integrated projection distortion in the allowable range is an urgent problem to be solved,therefore,in this paper,taking a basin in Tibetan basin for example,the compensating surface and arbitrary zone is selected by the principle of least squares to make Gauss projection to establish independent coordinate system to adapt to the test area.The results show the elevation correction is the main of length projection deformation in the reservoir basin,the elevation correction deformation in the independent coordinate system is much less than it in the national standard 3° with Gauss coordination system,and Gauss projection deformation also significantly reduces,the comprehensive deformation of the test area are all according with the engineering measurement standard,and it meets the needs of the whole basin projection deformation.%在藏区流域线路控制测量过程中,长度投影变形很容易超限,如何控制综合投影变形在允许的范围内是急需解决的问题.因此,该文以藏区某流域为例,通过最小二乘原理选取抵偿高程面及任意带进行高斯投影,建立与测区相适应的独立坐标系.结果表明,该流域长度投影变形以高程归化改正为主,独立坐标系下该项变形远小于国家3°带高斯坐标系,且高斯投影变形也显著减小,各测区综合变形均符合工程测量规范,满足整个流域投影变形需求.
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