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README.md
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# Datset Card for FLAIR land-cover semantic segmentation
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## Context & Data
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<hr style='margin-top:-1em' />
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The hereby FLAIR (#2) dataset is sampled countrywide and is composed of over 20 billion annotated pixels of very high resolution aerial imagery at 0.2 m spatial resolution, acquired over three years and different months (spatio-temporal domains).
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Aerial imagery patches consist of 5 channels (RVB-Near Infrared-Elevation) and have corresponding annotation (with 19 semantic classes or 13 for the baselines).
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Furthermore, to integrate broader spatial context and temporal information, high resolution Sentinel-2 satellite 1-year time series with 10 spectral band are also provided.
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<br><br>
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## Dataset Structure
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<hr style='margin-top:-1em' />
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The FLAIR dataset consists of 77 762 patches. Each patch includes a high-resolution aerial image (512x512) at 0.2 m, a yearly satellite image time series (40x40 by default by wider areas are provided) with a spatial resolution of 10 m
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and associated cloud and snow masks, and pixel-precise elevation and land cover annotations at 0.2 m resolution (512x512).
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<br><br>
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## Baseline code
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<hr style='margin-top:-1em' />
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We propose the U-T&T model, a two-branch architecture that combines spatial and temporal information from very high-resolution aerial images and high-resolution satellite images into a single output. The U-Net architecture is employed for the spatial/texture branch, using a ResNet34 backbone model pre-trained on ImageNet. For the spatio-temporal branch,
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the U-TAE architecture incorporates a Temporal self-Attention Encoder (TAE) to explore the spatial and temporal characteristics of the Sentinel-2 time series data,
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applying attention masks at different resolutions during decoding. This model allows for the fusion of learned information from both sources,
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## Reference
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<hr style='margin-top:-1em' />
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Please include a citation to the following article if you use the FLAIR dataset:
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```
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```
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## Acknowledgment
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<hr style='margin-top:-1em' />
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This work was performed using HPC/AI resources from GENCI-IDRIS (Grant 2022-A0131013803). This work was supported by the project "Copernicus / FPCUP” of the European Union, by the French Space Agency (CNES) and by Connect by CNES.<br>
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## Contact
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<hr style='margin-top:-1em' />
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If you have any questions, issues or feedback, you can contact us at: ai-challenge@ign.fr
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## Dataset license
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<hr style='margin-top:-1em' />
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The "OPEN LICENCE 2.0/LICENCE OUVERTE" is a license created by the French government specifically for the purpose of facilitating the dissemination of open data by public administration.<br/>
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This licence is governed by French law.<br/>
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This licence has been designed to be compatible with any free licence that at least requires an acknowledgement of authorship, and specifically with the previous version of this licence as well as with the following licences: United Kingdom’s “Open Government Licence” (OGL), Creative Commons’ “Creative Commons Attribution” (CC-BY) and Open Knowledge Foundation’s “Open Data Commons Attribution” (ODC-BY).
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# Datset Card for FLAIR land-cover semantic segmentation
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## Context & Data
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<hr style='margin-top:-1em; margin-bottom:0' />
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The hereby FLAIR (#2) dataset is sampled countrywide and is composed of over 20 billion annotated pixels of very high resolution aerial imagery at 0.2 m spatial resolution, acquired over three years and different months (spatio-temporal domains).
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Aerial imagery patches consist of 5 channels (RVB-Near Infrared-Elevation) and have corresponding annotation (with 19 semantic classes or 13 for the baselines).
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Furthermore, to integrate broader spatial context and temporal information, high resolution Sentinel-2 satellite 1-year time series with 10 spectral band are also provided.
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<br><br>
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## Dataset Structure
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<hr style='margin-top:-1em; margin-bottom:0' />
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The FLAIR dataset consists of 77 762 patches. Each patch includes a high-resolution aerial image (512x512) at 0.2 m, a yearly satellite image time series (40x40 by default by wider areas are provided) with a spatial resolution of 10 m
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and associated cloud and snow masks, and pixel-precise elevation and land cover annotations at 0.2 m resolution (512x512).
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<br><br>
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## Baseline code
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<hr style='margin-top:-1em; margin-bottom:0' />
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We propose the U-T&T model, a two-branch architecture that combines spatial and temporal information from very high-resolution aerial images and high-resolution satellite images into a single output. The U-Net architecture is employed for the spatial/texture branch, using a ResNet34 backbone model pre-trained on ImageNet. For the spatio-temporal branch,
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the U-TAE architecture incorporates a Temporal self-Attention Encoder (TAE) to explore the spatial and temporal characteristics of the Sentinel-2 time series data,
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applying attention masks at different resolutions during decoding. This model allows for the fusion of learned information from both sources,
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## Reference
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<hr style='margin-top:-1em; margin-bottom:0' />
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Please include a citation to the following article if you use the FLAIR dataset:
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```
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```
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## Acknowledgment
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<hr style='margin-top:-1em; margin-bottom:0' />
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This work was performed using HPC/AI resources from GENCI-IDRIS (Grant 2022-A0131013803). This work was supported by the project "Copernicus / FPCUP” of the European Union, by the French Space Agency (CNES) and by Connect by CNES.<br>
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## Contact
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<hr style='margin-top:-1em; margin-bottom:0' />
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If you have any questions, issues or feedback, you can contact us at: ai-challenge@ign.fr
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## Dataset license
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<hr style='margin-top:-1em; margin-bottom:0' />
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The "OPEN LICENCE 2.0/LICENCE OUVERTE" is a license created by the French government specifically for the purpose of facilitating the dissemination of open data by public administration.<br/>
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This licence is governed by French law.<br/>
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This licence has been designed to be compatible with any free licence that at least requires an acknowledgement of authorship, and specifically with the previous version of this licence as well as with the following licences: United Kingdom’s “Open Government Licence” (OGL), Creative Commons’ “Creative Commons Attribution” (CC-BY) and Open Knowledge Foundation’s “Open Data Commons Attribution” (ODC-BY).
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