# Monitoring restoration of alluvial margins using UAV-LiDAR

Hossein Ghaffarian, Jérôme Lejot, Hervé Piégay, Kristell Michel, Franck Perret

► To cite this version:

Hossein Ghaffarian, Jérôme Lejot, Hervé Piégay, Kristell Michel, Franck Perret. Monitoring restoration of alluvial margins using UAV-LiDAR. Séminaire scientifique annuel de l'OHM Vallée du Rhône, Graie, OHM Vallée du Rhône, Jun 2016, Lyon, France. hal-05335718

HAL Id: hal-05335718

https://hal.science/hal-05335718v1

Submitted on 28 Oct 2025

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Distributed under a Creative Commons Attribution 4.0 International License
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# Monitoring restoration of alluvial margins using UAV-LIDAR

H. Ghaffarian, J. Lejot, H. Piégay, K. Michel, F. Perret
Context of the study site

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Une première phase (1840-1940) pour la protection contre les crues et l'amélioration de la navigation

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Une deuxième phase (1937-1986) pour le développement de la production d'énergie, de l'irrigation et de la navigation

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Context of the study site

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9 May 2016

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* UAV-LiDAR can give high accurate maps

* Using dual return mode at the same time we have access to DSMs as well as DEMs

* In high vegetation density UAV approach would be useful

* In large scale projects UAV approach would be useful

<figure><img src="image_16.png" /><figcaption>Velodyne HDL-32E</figcaption></figure>

<figure><img src="image_17.png" /><figcaption>DS8 - Ciné - Power</figcaption></figure>

* Max payload: 3Kg

* Max autonomy: 15 mn

* Autopilot

<figure><img src="image_18.png" /><figcaption>Platform: independent 3-axis stabilization</figcaption></figure>

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<figure><img src="image_23.png" /><figcaption>Digital surface model
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<figure><img src="image_24.png" /><figcaption>Digital elevation model
(b)</figcaption></figure>

<figure><img src="image_25.png" /><figcaption>Canopy height model
(c)</figcaption></figure>
# LiDAR data preparation

1

* Extracting .CSV files from VeloView

2

* Converting PCLs to .PLY in Matlab

3

* Merging PLY files together with correct coordinates and rotations

4

* SHP and DEM production

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LATools

R2015a (8.5.0.197613)
64-bit (win64)
February 12, 2015
License Number: 1067144

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Sample of PCLs (Gerland Park, Lyon, France)

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Accuracy of data

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LiDAR data
Field measurement
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## Problems

- Calculating vertical accuracy (in ICP process)

- Check data on UAV

- Clear targets (in IMU correction process)

- Manual process (which takes a lot of time)

## Device to be operational

- Navigation System onboard (Dual-Antenna / Heading): Accuracy Position centimeter
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Merci de votre attention