[visionlist] [PhD offer] Scalable indexing and retrieval in multimedia and geospatial contents - Paris area, France

[Valerie Gouet]

[Apologies if you receive multiple copies of this offer]

PhD offer
Scalable indexing and retrieval in multimedia and geospatial contents
LASTIG Lab / IGN and Gustave Eiffel University
Great Paris area, France

All the details: https://www.umr-lastig.fr/vgouet/News/PhD_Thesis_proposal25-DALEAS.pdf

At a glance

Within the DALEAS project, the PhD will tackle the core challenge of content-based indexing and retrieval in multimedia contents at large scale. The multimedia contents considered, such as images, text, and 3D point clouds, illustrate or document the territory (a city, street, monument, etc.). The research will consist in designing efficient, flexible representations and indexing strategies that enable fast and accurate retrieval, depending on the data available in the query as well as in the georeferenced database queried. Here, retrieval will enable the identification of documents linked to a common geographical area, with the objective of geolocating the query. Building on previous work on LiDAR-to-text representations performed in LaSTIG, and on Multimodal Large Language Models in general, the candidate will propose fusion and alignment strategies to integrate heterogeneous data. Embedded in the Apache Spark™ infrastructure, this work will advance large-scale search in multimedia collections, with application to geospatial analysis of social network media in partnership with France Télévisions, for the detection of misinformation.

Keywords

Information retrieval, Indexing and Retrieval, Machine Learning, Multimodal Large Language Models, 3D Point Clouds, Geolocalization, Big Data, Apache Spark.

How to apply

Before November 21th, 2025, please send to both contacts, in a single PDF file, the following documents:

  *
A detailed CV
  *
A topic-focused cover letter
  *
Grades and ranks over the last 3 years of study
  *
The contact details of 2 referents who can recommend you

Candidatures which do not respect these instructions will not be considered.
Applications will be accepted until November 21st, with auditions conducted from November 24th to December 5th, and the decision released by December 10th.

Contacts


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Laurent Caraffa – Laurent.Caraffa at ign.fr<mailto:Laurent.Caraffa at ign.fr> <mailto:Laurent.Caraffa at ign.fr>
Researcher at LASTIG (PhD thesis supervisor), IGN, Gustave Eiffel University
  *
Valérie Gouet-Brunet – Valerie.Gouet at ign.fr<mailto:Valerie.Gouet at ign.fr>
Research director at LASTIG (director of the PhD thesis), IGN, Gustave Eiffel University



--
Valerie Gouet-Brunet
Senior researcher / DR1 Ministère de la Transition Ecologique
LASTIG Lab. / Univ. Gustave Eiffel / IGN (French mapping agency)
https://www.umr-lastig.fr/vgouet/

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