Skip to content
GitLab
    • Explore Projects Groups Topics Snippets
Projects Groups Topics Snippets
  • /
  • Help
    • Help
    • Support
    • Community forum
    • Submit feedback
    • Contribute to GitLab
  • Register
  • Sign in
  • F Fudaa Lspiv
  • Project information
    • Project information
    • Activity
    • Labels
    • Members
  • Repository
    • Repository
    • Files
    • Commits
    • Branches
    • Tags
    • Contributor statistics
    • Graph
    • Compare revisions
  • Issues 34
    • Issues 34
    • List
    • Boards
    • Service Desk
    • Milestones
  • Deployments
    • Deployments
    • Releases
  • Packages and registries
    • Packages and registries
    • Package Registry
    • Terraform modules
  • Monitor
    • Monitor
    • Incidents
  • Analytics
    • Analytics
    • Value stream
    • Repository
  • Wiki
    • Wiki
  • Activity
  • Graph
  • Create a new issue
  • Commits
  • Issue Boards
Collapse sidebar

En prévision de l'arrivée de la forge institutionnelle INRAE, nous vous invitons à créer vos nouveaux projets sur la forge MIA.

  • Image Velocimetry
  • Fudaa Lspiv
  • Wiki
  • User manual
  • Post processing of velocity results

Post processing of velocity results · Changes

Page history
Update Post processing of velocity results authored 5 months ago by Guillaume  Bodart's avatar Guillaume Bodart
Hide whitespace changes
Inline Side-by-side
Showing
with 11 additions and 28 deletions
+11 -28
User-manual/Post-processing-of-velocity-results.md
View page @ 53d8d99d
# Table of Contents # Table of Contents
[**7. Post-processing of Calculated Velocities**](#post-traitement-des-vitesses-calcul%C3%A9es) [**7. Post-processing of calculated velocities**](#post-processing-of-calculated-velocities)
- [Filtering Instantaneous Results](#wastebasket-filtrage-des-r%C3%A9sultats-instantan%C3%A9s) - [Filtering Instantaneous Results](#wastebasket-filtering-instantaneous-results)
- [1. Median Test](#1-test-m%C3%A9dian) - [1. Median Test](#1-median-test)
- [2. Velocity Threshold](#2-seuil-vitesse) - [2. Velocity Threshold](#2-velocity-threshold)
- [3. Correlation Threshold](#3-seuil-corr%C3%A9lation) - [3. Correlation Threshold](#3-correlation-threshold)
- [4. Correlation Peak](#4-pic-de-corr%C3%A9lation) - [4. Correlation Peak](#4-correlation-peak)
- [5. Velocity Distribution](#5-distribution-des-vitesses) - [5. Velocity Distribution](#5-velocity-distribution)
- [6. Perpendicular Velocity Dispersion to the Transect](#6-dispersion-des-vitesses-perpendiculaires-au-transect) - [6. Angular Dispersion](#6-angular-dispersion)
- [7. Angular Dispersion](#7-dispersion-angulaire)
- [Mean Results](#bar_chart-moyenne-des-r%C3%A9sultats) - [Mean Results](#bar_chart-moyenne-des-r%C3%A9sultats)
- [Statistics of Velocity Results](#chart_with_upwards_trend-statistiques-des-r%C3%A9sultats-de-vitesse) - [Statistics of Velocity Results](#chart_with_upwards_trend-statistiques-des-r%C3%A9sultats-de-vitesse)
...@@ -19,7 +18,7 @@ The post-processing step includes filtering and averaging the velocity results. ...@@ -19,7 +18,7 @@ The post-processing step includes filtering and averaging the velocity results.
![image70](uploads/1d1dcd6d6167fa949b94ca8182eb0eee/image70.png) ![image70](uploads/1d1dcd6d6167fa949b94ca8182eb0eee/image70.png)
# :wastebasket: Filtering Instantaneous Results # :wastebasket: Filtering instantaneous results
The **_Post-processing🡪 Filtering Instantaneous Results_** menu opens the filtering interface. Several filters are available: The **_Post-processing🡪 Filtering Instantaneous Results_** menu opens the filtering interface. Several filters are available:
1. Median Test: Filters based on the spatial consistency of velocities. 1. Median Test: Filters based on the spatial consistency of velocities.
...@@ -179,23 +178,7 @@ The velocity distribution filter ensures the temporal consistency of the results ...@@ -179,23 +178,7 @@ The velocity distribution filter ensures the temporal consistency of the results
For each time step, if the **norm deviates by more than 3 standard deviations from the mean norm**, the calculated velocity is rejected (default parameter ***n_std = 3***). For each time step, if the **norm deviates by more than 3 standard deviations from the mean norm**, the calculated velocity is rejected (default parameter ***n_std = 3***).
## 6. Dispersion of Perpendicular Velocities to the Transect ![filtres_dispCourant](uploads/c4ba9ab8c75889fc451e4386ff79b823/filtres_dispCourant.png) ## 6. Angular Dispersion ![filtres_dispAng](uploads/1a669c57d0deddb66ae9ad17e72d422c/filtres_dispAng.png)
| Parameter | Default Values | Description |
| --------- | -------------- | ----------- |
| **_CoVmax_** | 0.4 | Threshold for the coefficient of variation ($\frac{\sigma}{\mu}$) of the perpendicular velocity to the transect |
The filter for dispersion of perpendicular velocities to the transect rejects points with excessive velocity dispersion (perpendicular component to the transect). This filter is more drastic than the previous ones, **it directly rejects all velocities at the point**.
> :loudspeaker: _**Warning!**_
>
> This filter is dedicated to flow measurement applications. It **requires a bathymetric transect** to be provided.
The perpendicular component to the transect is determined for each velocity at the point (after passing through the previous filters). The **coefficient of variation** of this component is then calculated (the ratio of standard deviation to mean).
Points with a perpendicular velocity coefficient of variation greater than a **tolerance threshold of 0.4** are rejected (default parameter ***CoVmax = 0.4***).
## 7. Angular Dispersion ![filtres_dispAng](uploads/1a669c57d0deddb66ae9ad17e72d422c/filtres_dispAng.png)
| Parameter | Default Values | Description | | Parameter | Default Values | Description |
| --------- | -------------- | ----------- | | --------- | -------------- | ----------- |
......
Clone repository

Home

Manuel utilisateur (français)

  1. Généralités
  2. Démarrer avec Fudaa-LSPIV
  3. Commencer une étude Fudaa-LSPIV
  4. Gestion des images sources
  5. Orthorectification des images
  6. Calcul de la vitesse de déplacement des traceurs
  7. Post traitement des vitesses calculées
  8. Affichage des résultats de vitesse
  9. Calcul du débit
  10. Export des données
  11. Relancer les calculs d'une étude existante
  12. Bug connus et parades
  13. Approfondissements
  14. Références bibliographiques

User manual (English)

  1. General information
  2. Getting started with Fudaa-LSPIV
  3. Starting a Fudaa-LSPIV study
  4. Managing source images
  5. Image orthorectification
  6. Tracers velocity computation
  7. Post-processing of velocity results
  8. Display-velocity-results
  9. Discharge computation
  10. Data export
  11. Relaunch existing study computations
  12. Known bugs and workarounds
  13. Advanced
  14. References

Menu

Explore Projects Groups Topics Snippets