Workflow Scan-to-BIM : le projet de fin d’année d’étudiants de BTS Géomètre Topographe

Vincent Fredon Vincent Fredon 20/07/2017

6 min de lecture

Je cède la place pour ce post à Siamak Tafazzoli qui représente une équipe d’enseignants en BTS MGTMN d’Antibes. Il nous propose le compte rendu d’un projet de fin d’année qui exploite les scans laser et la modélisation.

Vous allez constater que la relève est assurée : la nouvelle génération se demandera comment on a pu travailler autrement qu’en mode BIM !


La réforme du BTS intitulé « Métier du Géomètre Topographe et de la Modélisation Numérique », a poussé l’équipe pédagogique du lycée Leonard de Vinci d’Antibes à s’investir dans la maquette numérique depuis 3 ans et à proposer aux étudiants de deuxième année des projets « Scan2bim ».

Les années précédentes, les projets se sont basés sur les scans et modélisations suivants :

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Figure 1 : Nuage de points de la Chapelle de la Colle sur Loup (06)

En 2017, le CSTB nous a permis d’utiliser leur site pour mettre en place ce workflow terrain-logiciel « Scan2Bim ».

Cette activité a été l’occasion de confronter nos étudiants à une situation professionnelle en plein essor, avec l’intégration du processus BIM dans les activités du Géomètre-Expert.

Elle permet aussi aux étudiants comme aux enseignants de se former aux outils sur des cas concrets, grâce à la politique éducative d’Autodesk.

Cet article est axé sur l’acquisition de données, l’interopérabilité entre les différents logiciels InfraWorks, AutoCAD Civil 3D, Covadis et une méthode d’édition de la maquette numérique par Revit après acquisition et traitement sous ReCap et Scene.

Pour assurer une compatibilité BIM optimale, nous avons défini un livrable basé sur une maquette numérique géoréférencée en privilégiant le format IFC.

Les prises de mesures sur le terrain (1,1 hectare et un bâtiment R+2) ont été réalisées grâce aux équipements suivants :

Ce relevé a été complété par des points déterminés par Gnss à l’aide d’un Leica Gs15 Rtk, indispensable pour recaler l’ensemble dans Infraworks en RGF93, projection Lambert 93.

Les étudiants ont ainsi travaillé en autonomie sur le terrain durant une semaine pour prendre l’ensemble des données.

Ils ont complété les acquisitions avec les données du RGE (Référentiel à Grande Echelle) Altmétrique de l’IGN (site pro de l’IGN) ainsi que l’orthophoto récupérée sur le site du Crige (avec un drapage sur le MNT).

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Figure 2 : Site professionnel de l'IGN

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Figure 3 : Site du CRIGE PACA

Chaque équipier est assigné à une tâche et ils se consultent, collaborent pour s’initier au processus BIM.

 

Le workflow proposé est le suivant :

1 – Dans InfraWorks, AutoCAD Civil 3D et Covadis

Nous avons combiné les capacités de création et gestion de MNT (Modèles Numériques de Terrains) offertes par les logiciels pour comparer les données sources.

En intégrant le MNT issu des données de l’IGN sous AutoCAD Civil3D et celui automatiquement généré par Infraworks par le biais d’un export BIM au format IMX, on a pu constater des écarts altimétriques entre 30 cm et 2 m (écarts entre 2 MNT).

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Figure 4 : Comparaison entre deux MNT sous Covadis

Ceci semble logique car les points des MNT sont issus :

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Figure 5 : Plan topographique du site du CSTB

De ce fait, l’import du MNT provenant des points du RGE ALTI® permettra une intégration dans le site de notre maquette plus proche de la réalité, tout en gardant le modèle général d’InfraWorks pour l’insertion dans le site.

InfraWorks réadapte alors automatiquement son MNT en intégrant celui de l’IGN.

Dans AutoCAD Civil 3D et Covadis

 

2 – Dans ReCap

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Figure 6 : Assemblage manuel sous ReCap

Ci-dessous quelques constats issus de ces travaux pour réussir un « bon » calage ReCap :

Overlap ou chevauchement : c‘est la quantité de points d’un scan qui sont en commun avec les points d’autres scans. On conseille d’avoir au moins 30% pour que la registration se passe bien.

Balance : L'équilibre représente la qualité des éléments (ou des surfaces) utilisées pour l'enregistrement. Par exemple les surfaces qui font face à des directions x, y et z produiront de meilleurs résultats que les surfaces qui sont dans une ou deux directions. Une mauvaise balance peut provenir de scans extérieurs où seul le sol et le mur uniques sont visibles. Un bon équilibre peut provenir d'une zone intérieure où de nombreux murs, le sol et le plafond sont visibles.

 

3 – Dans Revit

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Figure 7 : Surface topo dans Revit

 

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Figure 8 : Maquette niveau de détail Lod 4

 

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Figure 9 : Rendu réaliste de la maquette numérique

 

4 – Dans InfraWorks

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Figure 10 : Création du modèle dans InfraWorks

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Figure 11 : Insertion du MNT depuis AutoCAD Civil 3D dans InfraWorks

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Figure 12 : Insertion du nuage de points dans le modèle InfraWorks

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Figure 13 : Insertion de la maquette du bâtiment dans le modèle général InfraWorks

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Figure 14 : Intégration finale (arbres Revit)

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Figure 15 : Insertion d’arbres d’arbres InfraWorks plus réalistes

 

En conclusion, Nous tenons à remercier l’équipe de projet constituée de Kristofer Gil, Ludovic Rascanier et Thibaud Boivin pour son implication et l’autonomie développées dans ce projet ambitieux ainsi que le CSTB pour la mise à disposition du site.

S. Tafazzoli, S. Milles, S. François, C. Streith, G. Decourt.

Enseignants en BTS MGTMN au lycée Léonard de Vinci à Antibes (06)


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We use 6 Sense to deploy digital advertising on sites supported by 6 Sense. Ads are based on both 6 Sense data and behavioral data that we collect while you’re on our sites. The data we collect may include pages you’ve visited, trials you’ve initiated, videos you’ve played, purchases you’ve made, and your IP address or device ID. This information may be combined with data that 6 Sense has collected from you. We use the data that we provide to 6 Sense to better customize your digital advertising experience and present you with more relevant ads. 6 Sense Privacy Policy
Terminus
We use Terminus to deploy digital advertising on sites supported by Terminus. Ads are based on both Terminus data and behavioral data that we collect while you’re on our sites. The data we collect may include pages you’ve visited, trials you’ve initiated, videos you’ve played, purchases you’ve made, and your IP address or device ID. This information may be combined with data that Terminus has collected from you. We use the data that we provide to Terminus to better customize your digital advertising experience and present you with more relevant ads. Terminus Privacy Policy
StackAdapt
We use StackAdapt to deploy digital advertising on sites supported by StackAdapt. Ads are based on both StackAdapt data and behavioral data that we collect while you’re on our sites. The data we collect may include pages you’ve visited, trials you’ve initiated, videos you’ve played, purchases you’ve made, and your IP address or device ID. This information may be combined with data that StackAdapt has collected from you. We use the data that we provide to StackAdapt to better customize your digital advertising experience and present you with more relevant ads. StackAdapt Privacy Policy
The Trade Desk
We use The Trade Desk to deploy digital advertising on sites supported by The Trade Desk. Ads are based on both The Trade Desk data and behavioral data that we collect while you’re on our sites. The data we collect may include pages you’ve visited, trials you’ve initiated, videos you’ve played, purchases you’ve made, and your IP address or device ID. This information may be combined with data that The Trade Desk has collected from you. We use the data that we provide to The Trade Desk to better customize your digital advertising experience and present you with more relevant ads. The Trade Desk Privacy Policy
RollWorks
We use RollWorks to deploy digital advertising on sites supported by RollWorks. Ads are based on both RollWorks data and behavioral data that we collect while you’re on our sites. The data we collect may include pages you’ve visited, trials you’ve initiated, videos you’ve played, purchases you’ve made, and your IP address or device ID. This information may be combined with data that RollWorks has collected from you. We use the data that we provide to RollWorks to better customize your digital advertising experience and present you with more relevant ads. RollWorks Privacy Policy

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We can access your data only if you select "yes" for the categories on the previous screen. This lets us tailor our marketing so that it's more relevant for you. You can change your settings at any time by visiting our privacy statement

Your experience. Your choice.

We care about your privacy. The data we collect helps us understand how you use our products, what information you might be interested in, and what we can improve to make your engagement with Autodesk more rewarding.

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Explore the benefits of a customized experience by managing your privacy settings for this site or visit our Privacy Statement to learn more about your options.