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《公路勘测规范》规定,选择路线平面控制测量坐标系时,应使测区内投影长度变形值小于2.5cm/km。如果不考虑投影高程的影响,投影范围控制在中央子午线东西各45km以内,才能满足规范要求,因此选择合适的测量坐标系是公路测量经常碰到的问题;选择好坐标系后,还必须提供所选坐标系与其它坐标系之间的转换关系。文章提出了简便易行的坐标系选择和转换方法。
“Highway Survey Code” provides that the choice of route plane control measurement coordinate system, the projection area should be measured so that the deformation of the length of less than 2.5cm / km. If you do not consider the impact of the projection elevation, the projection range control in the central meridian things within 45km, to meet the regulatory requirements, so select the appropriate measurement of the coordinate system is often encountered in road measurement problems; choose a good coordinate system, you must also provide Select the coordinate system and the relationship between the conversion of the other coordinate system. The paper presents a simple and easy method of coordinate system selection and conversion.