Update text of org card to better explain the concept of geospatial foundation models

README.md

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-European Space Agency (ESA), Phi-lab: [ESA-Philab](http://philab.esa.int/)
 
-Projects: EO Foundation Models
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+The PhilEO project aims to develop geospatial AI Foundation Models for Earth Observation. Foundation Models are a paradigm shift from task-specific AI models. They are trained in a self-supervised way on large scale data. Then they can be adapted to various downstream tasks by fine-tuning, hopefully with few samples and performances equal or better than fully supervised AI models.
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+The first asset of the PhilEO project is the PhilEO Bench, a benchmark of geospatial tasks to evaluate the performances of State-Of-The-Art Foundation Models on diverse downstream applications.
 
 PhilEO Bench: Evaluating Geo-Spatial Foundation Models - [PhilEO-Paper](http://arxiv.org/pdf/2401.04464.pdf)
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+Powered by European Space Agency (ESA), Phi-lab: [ESA-Philab](http://philab.esa.int/)