Create README.md

README.md

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+---
+license: cc-by-4.0
+tags:
+- earth-observation
+- remote-sensing
+- foundation-model
+- pretrain
+- self-supervised-learning
+- sentinel
+pretty_name: Copernicus-Pretrain
+size_categories:
+- 10M<n<100M
+---
+# Dataset Card for Copernicus-Pretrain
+
+<!-- Provide a quick summary of the dataset. -->
+
+A large-scale EO pretraining dataset with 18.7M aligned images covering all major Sentinel missions (S1,2,3,5P).
+
+*Officially named **Copernicus-Pretrain**, also referred to as SSL4EO-S ("S" means Sentinel), as an extension of [SSL4EO-S12](https://github.com/zhu-xlab/SSL4EO-S12) to the whole Sentinel series.*
+
+## Dataset Details
+
+### Dataset Description
+
+<!-- Provide a longer summary of what this dataset is. -->
+
+Copernicus-Pretrain contains 18.7M aligned imagery from all major Sentinel missions in operation (Sentinel-1 SAR, Sentinel-2 multispectral reflectance, Sentinel-3 multispectral radiance, and Sentinel-5P atmospheric variables), as well as an elevation product Copernicus DEM GLO-30.
+The images are organized into ~310K regional grids (0.25x0.25, consistent with ERA5), densely covering the whole land surface and near-land ocean with eight distinct Sentinel modalities.
+
+|     |  Modality            | GSD   | Image size            | # Grid cells | # Patches | # Timestamps | # Total images |
+|-----------|----------------------|-------|-----------------------|--------------|-----------|--------------|----------------|
+| Sentinel-1 GRD  | SAR   | 10 m  | 264×264×2  | 247,723     | 1,067,267 | ~4          | 4,227,387     |
+| Sentinel-2 TOA  | MS    | 10 m  | 264×264×13 | 247,723     | 1,067,267 | ~4          | 4,218,065     |
+| Sentinel-3 OLCI | MS    | 300 m | 96×96×21   | 281,375     | 281,375   | ~8          | 2,189,561     |
+| Sentinel-5P CO  | atmos.| 1 km  | 28×28      | 306,097     | 306,097   | 1–12        | 2,104,735     |
+| Sentinel-5P NO2 | atmos.| 1 km  | 28×28      | 291,449     | 291,449   | 1–12        | 1,752,558     |
+| Sentinel-5P SO2 | atmos.| 1 km  | 28×28      | 262,259     | 262,259   | 1–12        | 1,366,452     |
+| Sentinel-5P O3  | atmos.| 1 km  | 28×28      | 306,218     | 306,218   | 1–12        | 2,556,631     |
+| Copernicus DEM  | elevation | 30 m | 960×960   | 297,665     | 297,665   | 1           | 297,665       |
+| **Copernicus-Pretrain** |  |  |  | **312,567** | **3,879,597** |  | **18,713,054** |
+
+
+
+
+
+- **Curated by:** Wang, Yi, et al.
+- **Funded by [optional]:** ThinkingEarth (Horizon Europe 101130544)
+- **License:** CC BY 4.0
+
+### Dataset Sources
+
+<!-- Provide the basic links for the dataset. -->
+
+- **Repository:** [More Information Needed]
+- **Paper [optional]:** [More Information Needed]
+- **Demo [optional]:** [More Information Needed]
+
+
+
+## Dataset Structure
+
+<!-- This section provides a description of the dataset fields, and additional information about the dataset structure such as criteria used to create the splits, relationships between data points, etc. -->
+
+[More Information Needed]
+
+
+
+## Citation
+
+<!-- If there is a paper or blog post introducing the dataset, the APA and Bibtex information for that should go in this section. -->
+
+**BibTeX:**
+
+[More Information Needed]
+