---
title: "FF/FL Analysis"
slug: "cyclone-3dr-fffl-analysis"
updated: 2026-10-06T08:33:24Z
published: 2026-10-06T08:33:24Z
canonical: "rcdocs.leica-geosystems.com/cyclone-3dr-fffl-analysis"
---

> ## 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.

# FF/FL Analysis

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

This workflow computes the Floor Flatness/Floor Levelness (FF/FL) values of a measured ground according to ASTM E1155.

> [!TIP]
> ### Requirements
> 
> Select one cloud (either a native 3DR cloud or a LGSx) and optionally a limit box. Then launch the workflow.

> [!WARNING]
> ### Notes
> 
> It is highly recommended to keep the same UCS activated all along the workflow since its Z direction is used for the analysis.

> [!TIP]
> ### Practice
> 
> - [Exercise: perform an FF/FL analysis](/v1/docs/cyclone-3dr-exercise-perform-a-ff-fl-analysis)