---
title: "Median line"
slug: "cyclone-3dr-medianlinec"
updated: 2026-09-07T11:51:31Z
published: 2026-09-07T11:51:31Z
canonical: "rcdocs.leica-geosystems.com/cyclone-3dr-medianlinec"
---

> ## Documentation Index
> Fetch the complete documentation index at: https://rcdocs.leica-geosystems.com/llms.txt
> Use this file to discover all available pages before exploring further.

# Median line

![CmdMedianLine.svg](https://cdn.document360.io/820e11db-8ed5-45ae-ac86-f6b77dcb2aa7/Images/Documentation/CmdMedianLine.svg)

This function creates a "median" polyline, that is to say:

- for each input vertex, other polylines are cut into segments which have the same length ratio
- then the gravity center is computed for each set of vertices
- finally, gravity centers are joined so as to create the median polyline

> [!TIP]
> ### Requirements
> 
> Select several polylines and launch the command.
> 
> Make sure that the selected polylines have the same direction.

> [!NOTE]
> ### Technical information
> 
> ![image-20250509-122224.png](https://cdn.document360.io/820e11db-8ed5-45ae-ac86-f6b77dcb2aa7/Images/Documentation/image-20250509-122224.png)
> 
> **Fig. Perspective view: green polylines: inputs, purple points: new vertices, red polyline: median polyline**