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<i>[Apologies if you receive multiple copies of this offer]</i></div>
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<b>PhD offer</b></div>
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<b>Scalable indexing and retrieval in multimedia and geospatial contents</b></div>
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LASTIG Lab / IGN and Gustave Eiffel University</div>
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Great Paris area, France</div>
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<b>All the details:</b> <a class="OWAAutoLink" id="OWA47916167-c045-f0cf-c84c-b82428fbbb80" href="https://www.umr-lastig.fr/vgouet/News/PhD_Thesis_proposal25-DALEAS.pdf">
https://www.umr-lastig.fr/vgouet/News/PhD_Thesis_proposal25-DALEAS.pdf</a> </div>
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<b>At a glance</b></div>
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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.</div>
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<b>Keywords</b></div>
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Information retrieval, Indexing and Retrieval, Machine Learning, Multimodal Large Language Models, 3D Point Clouds, Geolocalization, Big Data, Apache Spark.</div>
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<b>How to apply</b></div>
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Before November 21th, 2025, please send to both contacts, <u>in a single PDF file</u>, the following documents: </div>
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<div style="text-align: justify;" role="presentation">A detailed CV</div>
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<div style="text-align: justify;" role="presentation">A topic-focused cover letter </div>
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<div style="text-align: justify;" role="presentation">Grades and ranks over the last 3 years of study </div>
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<div style="text-align: justify;" role="presentation">The contact details of 2 referents who can recommend you </div>
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Candidatures which do not respect these instructions will not be considered. </div>
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<b>Applications will be accepted until November 21st, with auditions conducted from November 24th to December 5th, and the decision released by December 10th.</b></div>
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<b>Contacts</b></div>
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<div style="text-align: justify;" role="presentation">Laurent Caraffa – <a title="Laurent.Caraffa@ign.fr" class="OWAAutoLink" id="OWA9b29001d-66f5-f149-6fa4-49b6c408609a" href="mailto:Laurent.Caraffa@ign.fr">
Laurent.Caraffa@ign.fr</a><a style="text-decoration: none;" title="Laurent.Caraffa@ign.fr" class="OWAAutoLink" id="OWA35b227aa-fabe-7521-c5b2-1b3a4a27fd7c" href="mailto:Laurent.Caraffa@ign.fr"> </a></div>
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<div style="text-align: justify;" role="presentation">Researcher at LASTIG (PhD thesis supervisor), IGN, Gustave Eiffel University</div>
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<div style="text-align: justify;" role="presentation">Valérie Gouet-Brunet – <a title="Valerie.Gouet@ign.fr" class="OWAAutoLink" id="OWA3cb5bfba-190d-8d35-ce3d-c68b9496ef0a" href="mailto:Valerie.Gouet@ign.fr">
Valerie.Gouet@ign.fr</a> </div>
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<div style="text-align: justify;" role="presentation">Research director at LASTIG (director of the PhD thesis), IGN, Gustave Eiffel University</div>
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Valerie Gouet-Brunet<br>
Senior researcher / DR1 Ministère de la Transition Ecologique<br>
LASTIG Lab. / Univ. Gustave Eiffel / IGN (French mapping agency)<br>
https://www.umr-lastig.fr/vgouet/</div>
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