无定向导线粗差初探

Discussion on the Gross Errors of Non orientation Traverse

１引言由于城市建设的迅速发展，旧城改造力度的不断加大，城市原有各等级控制遭到了不同程度的毁坏，使部分控制点成为孤点或死点。在这些地区施测时，有时因工程进度或其它原因，在时间上不允许重新布控，因此往往采用无定向导线进行加密，以满足工程建设的需要。无定向...

In the exploration of underground pipelines errors occurred in telecommunication channels explorations are often large.Modification method of equivalent centre is proposed herein through the simulations of many anomalies of cables and combined with practical experience.Verified by practices the said method is effective.