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施工测量要求采用国家基准作为起算数据,需要与测区的国家控制点进行联测,获得在国家测量基准下的平面坐标和高程数据。由于采用分带投影,靠近中央子午线的测区变形较小,但工程项目所在区域往往会高出参考椭球面且远离中央子午线,投影变形值一般会超出限差要求。目前控制测量的方法主要采用GPS进行施测,其方法简便、高效,但其成果向施工坐标转换时还需解决投影变形问题。本文就工程测量中如何用GPS方法解决投影长度变形问题进行研究和应用。
Construction survey requires the use of the national benchmark as a starting point and requires joint testing with the national control points of the survey area to obtain plane coordinates and elevation data under national measurement standards. Due to the use of zonal projection, the deformation of the survey area near the central meridian is small, but the project area is often higher than the reference ellipsoid and away from the central meridian. The projection deformation values generally exceed the limit requirements. Currently, the method of controlling the measurement mainly adopts GPS for measuring and measuring. The method is simple and efficient, but the problem of projection deformation needs to be solved when the result is transferred to the construction coordinate. In this paper, how to solve the problem of projection length deformation by GPS method in engineering surveying is studied and applied.