Replace dataset with FranceCrops v1 release (#5)

- Replace dataset with FranceCrops v1 release (30fa0b31d25ac3bb9d13d93d432ed1527caf0e0b)

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README.md

@@ -1,79 +1,385 @@
 ---
 pretty_name: FranceCrops
-license: cc-by-sa-4.0
-tags:
-- earth-observation
-- remote-sensing
-- agriculture
-- timeseries
-- geospatial
+license: cc-by-4.0
 task_categories:
-- image-classification
+  - tabular-classification
+task_ids:
+  - tabular-multi-class-classification
+tags:
+  - agriculture
+  - crop-classification
+  - crop-type-mapping
+  - earth-observation
+  - geospatial
+  - remote-sensing
+  - sentinel-2
+  - sentinel-2-l2a
+  - timeseries
+  - time-series-classification
+  - representation-learning
+  - self-supervised-learning
+  - low-label-learning
+  - few-shot-learning
+  - france
+  - rpg
+  - parquet
+  - geoparquet
+  - tabular
 size_categories:
-- 10K<n<100K
+  - 100K<n<1M
+configs:
+  - config_name: benchmark
+    default: true
+    data_files:
+      - split: train
+        path: data/benchmark/train.parquet
+      - split: validation
+        path: data/benchmark/validation.parquet
+      - split: test_france
+        path: data/benchmark/test_france.parquet
+      - split: test_centre_val_de_loire
+        path: data/benchmark/test_centre_val_de_loire.parquet
+  - config_name: train_subsets
+    data_files:
+      - split: train
+        path: data/protocol/train_subsets.parquet
+  - config_name: metadata
+    data_files:
+      - split: train
+        path: data/protocol/metadata.parquet
+  - config_name: geolocation
+    data_files:
+      - split: train
+        path: data/geolocation/geolocation.parquet
+  - config_name: class_map
+    data_files:
+      - split: train
+        path: data/protocol/class_map.parquet
+  - config_name: normalization
+    data_files:
+      - split: train
+        path: data/protocol/normalization.parquet
 ---
 
-# Dataset Card for FranceCrops
+# FranceCrops
+
+FranceCrops is a crop-classification benchmark for French agricultural parcels observed with Sentinel-2 L2A time series meant to evaluate the representation learned by self-supervised or unsupervised methods. Each sample is one parcel represented by 100 sampled pixel time series. This release provides fixed supervised splits for downstream evaluation and frozen low-label subsets from 1 to 4,000 labels per class so methods can be compared under the same downstream training budgets. 
+
+A large pretraining pool for representation learning will be added in a later release.
+The benchmark code will be made available soon.
+
+## Dataset structure
+
+| Config | Split(s) | Purpose | Rows | Size |
+| --- | --- | --- | ---: | ---: |
+| `pretraining` | `train` | representation-learning pool, coming soon, for SSL or unsupervised encoder training | ||
+| `benchmark` | `train`, `validation`, `test_france`, `test_centre_val_de_loire` | Main supervised crop-classification benchmark | 138,610 | 12.7 GiB |
+| `train_subsets` | `train` | Frozen low-label row selections from `benchmark/train` at various sizes | 553,000 |3 MiB |
+| `class_map` | `train` | Mapping from `y` to RPG crop codes and labels | 20 | <0.01 MiB |
+| `normalization` | `train` | Frozen per-band percentile constants for normalization | 12 | <0.01 MiB |
+| `metadata` | `train` | Optional split membership and labels without large `x` arrays | 138,610 | 0.7 MiB |
+| `geolocation` | `train` | Optional parcel geometries and footprints for metadata rows. See [`data/geolocation/README.md`](data/geolocation/README.md) for details. | 138,610 | 54.5 MiB |
+
+
+## Split details
+
+FranceCrops separates representation learning from downstream evaluation. 
+The `pretraining` split is meant for self-supervised or other unsupervised learning: use it to learn a generic parcel encoder without using crop labels. 
+The `benchmark` config is the supervised crop-classification downstream task used to compare those representations under a fixed protocol.
+
+A typical experiment follows this order once the pretraining payload is available:
+
+1. learn an encoder on `pretraining`;
+2. freeze or reuse the learned features for the supervised benchmark samples;
+3. train downstream supervised classifiers on the frozen `train_subsets`, from 1 labeled example per class up to 4,000 labeled examples per class;
+4. use `validation` for early stopping or hyperparameter tuning;
+5. report final scores on both benchmark test splits.
+
+Supervised benchmark split sizes:
+
+| Split | Role | Class coverage and balance | Rows | Size |
+| --- | --- | --- | ---: | ---: |
+| `train` | supervised training pool | 20 classes, balanced; 5,000 samples per class | 100,000 | 9.1 GiB |
+| `validation` | model-selection split | 20 classes, balanced; 100 samples per class | 2,000 | 185 MiB |
+| `test_france` | main test split | 20 classes, balanced; held-out spatial-cell test partition with 1,000 examples per class | 20,000 | 1.9 GiB |
+| `test_centre_val_de_loire` | geographic robustness test | 20 classes, capped at 1,000 examples per class; not perfectly balanced where regional data are scarce | 16,610 | 1.7 GiB |
+
+The benchmark task is restricted to 20 crop classes so that supervised evaluation is controlled and comparable. The `train`, `validation`, and `test_france` splits are balanced across these 20 classes. The `test_centre_val_de_loire` split uses the same 20 classes and caps each class at 1,000 examples, but some classes have fewer available parcels in that region. In contrast, the `pretraining` split is closer to the raw source distribution: it is unfiltered, contains all 238 RPG classes, and has the heavy class imbalance expected in the full agricultural parcel population.
+
+All splits are disjoint: a parcel appears in only one of
+`pretraining`, `train`, `validation`, `test_france`, or
+`test_centre_val_de_loire`. The two test splits also test geographic
+generalization. `test_france` is made of held-out spatial cells distributed across
+metropolitan France, visible as squares in the map below. `test_centre_val_de_loire`
+holds out the whole Centre-Val de Loire region as a separate regional test set. The
+`pretraining`, `train`, and `validation` splits are mutually disjoint and draw from
+the remaining parcel distribution, spread across metropolitan France outside those
+held-out spatial cells and the Centre-Val de Loire regional holdout.
+
+![FranceCrops split geography](assets/protocol_spatial_splits_proposed.png)
+
+## Data Schema
+
+Each row in the `benchmark` config contains:
+
+| Field | Type | Description |
+| --- | --- | --- |
+| `x` | `int16[100, 60, 12]` | 100 sampled pixel time series, 60 dates, 12 Sentinel-2 bands |
+| `y` | `int16` | Zero-based class identifier |
+| `parcel_id` | string | Source RPG parcel identifier used for protocol joins |
+
+Each raw sample is a bag of time series for one parcel:
+
+```text
+x.shape == (100, 60, 12)
+```
+
+- `100`: sampled pixel time series inside the parcel;
+- `60`: aligned dates;
+- `12`: Sentinel-2 bands.
+
+The band order is:
+
+```text
+B1, B2, B3, B4, B5, B6, B7, B8, B8A, B9, B11, B12
+```
+
+The temporal axis contains 60 aligned dates from 2022-02-01 to 2022-11-23
+inclusive, every 5 days.
+
+Values are stored as `int16` in the Sentinel-2 L2A surface-reflectance integer
+scale, where 10,000 corresponds to reflectance 1.0. Cast `x`
+to `float32` before normalization or model input.
+
+<details>
+<summary>Class map</summary>
+
+| y | code | French RPG label | English label |
+| ---: | --- | --- | --- |
+| 0 | AVP | Avoine de printemps | Spring oat |
+| 1 | BDH | Blé dur d’hiver | Winter durum wheat |
+| 2 | BTH | Blé tendre d’hiver | Winter soft wheat |
+| 3 | BTN | Betterave non fourragère / Bette | Non-fodder beet / Swiss chard |
+| 4 | CHU | Chou | Cabbage |
+| 5 | CZH | Colza d’hiver | Winter rapeseed |
+| 6 | FVL | Féverole semée avant le 31/05 | Faba bean sown before 31/05 |
+| 7 | LIF | Lin fibres | Fiber flax |
+| 8 | MIS | Maïs | Maize |
+| 9 | ORH | Orge d'hiver | Winter barley |
+| 10 | PPH | Prairie permanente | Permanent grassland |
+| 11 | PPR | Pois de printemps semé avant le 31/05 | Spring pea sown before 31/05 |
+| 12 | PTC | Pomme de terre de consommation | Table potato |
+| 13 | RGA | Ray-grass de 5 ans ou moins | Ryegrass, 5 years or less |
+| 14 | SGH | Seigle d’hiver | Winter rye |
+| 15 | SOG | Sorgho | Sorghum |
+| 16 | SOJ | Soja | Soybean |
+| 17 | SRS | Sarrasin | Buckwheat |
+| 18 | TRN | Tournesol | Sunflower |
+| 19 | TTH | Triticale d’hiver | Winter triticale |
+
+</details>
+
+## Benchmark Protocol
+
+The benchmark evaluates one representation per parcel. If an encoder processes
+individual pixel time series, aggregate the 100 pixel-level representations into a
+single parcel-level representation before fitting the downstream classifier.
+
+The benchmark evaluates each representation on the same downstream training subsets. This is important in the low-label regime: when only a few labeled parcels are available for supervised training, results can vary strongly depending on which parcels were selected. The dataset therefore provides several frozen repeats for the smallest label budgets. Repeats for a given budget may overlap, but every method is evaluated on the same subsets, making comparisons more stable and focused on representation quality rather than on a particular draw of downstream labels.
+
+Downstream training budgets are:
 
-## Dataset Summary
+```text
+1, 2, 5, 10, 20, 50, 100, 200, 500, 1000, 2000, 4000 labeled examples per class
+```
+
+Repeat counts decrease as the supervised training set becomes larger:
+
+| Labeled examples per class | Number of frozen repeats |
+| ---: | ---: |
+| 1 | 50 |
+| 2 | 25 |
+| 5 | 20 |
+| 10 | 10 |
+| 20, 50, 100, 200, 500, 1000 | 5 |
+| 2000, 4000 | 3 |
+
+Repeats for a given budget may overlap. Scores should be averaged over all frozen repeats
+for each label budget.
+
+## Results
+
+The full benchmark runner and protocol details will be released in the
+associated GitHub repository.
+
+The reference baseline is the following:
+
+1. averages the 100 pixel time series for each parcel;
+2. applies the frozen per-band `low_p2`/`high_p98` transformation
+   `(x - low_p2) / (high_p98 - low_p2) - 0.5`;
+3. flattens the resulting `60 x 12` tensor;
+4. fits balanced multinomial logistic regression;
+5. selects `C` using validation balanced accuracy;
+6. evaluates once on `test_france` and `test_centre_val_de_loire`.
+
+In other words, the reference logistic-regression representation is the feature mean
+across the 100 time series in the bag, followed by normalization and flattening.
 
-FranceCrops is a satellite imagery time series dataset for crop classification in France. 
+Reference raw-feature results (mean +/- spread):
 
-Each sample in the dataset consists of:
-- **Input Features (`x`)**: 3D arrays of shape (100, 60, 12) in float16:
-  - 100: number of timeseries sampled within an agricultural field
-  - 60: temporal dimension (measurements every 5 days from 01/02/2022 to 30/11/2022)
-  - 12: spectral bands from Sentinel-2 satellite
-- **Labels (`y`)**: Integer class labels (int16), one of 20 crop types
+![Raw baseline low-label curves with std error bars](assets/low_label_curves.png)
 
-## Splits
+Scores are mean +/- sample standard deviation over frozen low-label repeats,
+reported in percentage points and rounded to one significant digit in the spread.
 
-🚧 Work in Progress 🚧
+| n/class | repeats | France BA (%; mean +/- spread) | Centre-Val de Loire BA (%; mean +/- spread) | France macro F1 (%; mean +/- spread) | Centre-Val de Loire macro F1 (%; mean +/- spread) |
+| ---: | ---: | :--- | :--- | :--- | :--- |
+| 1 | 50 | 28 +/- 3 | 25 +/- 3 | 26 +/- 3 | 21 +/- 3 |
+| 2 | 25 | 35 +/- 3 | 31 +/- 3 | 34 +/- 3 | 28 +/- 2 |
+| 5 | 20 | 46 +/- 2 | 41 +/- 2 | 46 +/- 2 | 37 +/- 2 |
+| 10 | 10 | 52 +/- 1 | 46 +/- 1 | 52 +/- 2 | 43 +/- 2 |
+| 20 | 5 | 59.1 +/- 0.9 | 52 +/- 2 | 59 +/- 1 | 48 +/- 2 |
+| 50 | 5 | 67.3 +/- 0.4 | 59.8 +/- 0.9 | 67.2 +/- 0.4 | 57 +/- 1 |
+| 100 | 5 | 72.3 +/- 0.3 | 62.2 +/- 0.8 | 72.2 +/- 0.3 | 59 +/- 1 |
+| 200 | 5 | 77.0 +/- 0.4 | 67.4 +/- 0.6 | 77.0 +/- 0.5 | 65.2 +/- 0.6 |
+| 500 | 5 | 81.3 +/- 0.2 | 72 +/- 1 | 81.3 +/- 0.2 | 71 +/- 2 |
+| 1000 | 5 | 84.3 +/- 0.2 | 75.1 +/- 0.7 | 84.3 +/- 0.2 | 74.0 +/- 0.3 |
+| 2000 | 3 | 86.1 +/- 0.2 | 77.0 +/- 0.2 | 86.2 +/- 0.2 | 76.7 +/- 0.5 |
+| 4000 | 3 | 87.36 +/- 0.08 | 78.27 +/- 0.09 | 87.37 +/- 0.08 | 77.9 +/- 0.1 |
 
-- `train`: 20,000 samples (~3.4GB)
+## Loading
 
-## Usage
+We recommend users to use this dataset through the benchmark code (will be made available soon).
+Below are some example on how to acces the data manually.
+Load the supervised benchmark splits:
 
 ```python
 from datasets import load_dataset
-# Load the dataset
-dataset = load_dataset("saget-antoine/francecrops", split="train")
 
-# Example of accessing a single sample
-sample = dataset[0]
-x = sample["x"]  # Get the input features
-y = sample["y"]  # Get the label
+repo = "saget-antoine/francecrops"
+
+train = load_dataset(repo, "benchmark", split="train")
+validation = load_dataset(repo, "benchmark", split="validation")
+test_france = load_dataset(repo, "benchmark", split="test_france")
+test_centre_val_de_loire = load_dataset(
+    repo,
+    "benchmark",
+    split="test_centre_val_de_loire",
+)
 ```
 
-Typical usage with PyTorch:
+Load one frozen low-label training subset and use it to select rows from
+`benchmark/train`:
 
 ```python
-import torch
-from torch.utils.data import DataLoader
-from datasets import load_dataset
+subsets = load_dataset(repo, "train_subsets", split="train")
+
+selection = subsets.filter(
+    lambda row: row["n_per_class"] == 100 and row["subset_id"] == 0
+)
 
-dataset = load_dataset("saget-antoine/francecrops", split="train").with_format("torch", columns=["x", "y"], dtype=torch.float16)
+train_row_indices = list(selection["train_row_idx"])
+train_100_per_class = train.select(train_row_indices)
+parcel_ids = selection["parcel_id"]
 
-train_loader = DataLoader(dataset, batch_size=1024, shuffle=True, num_workers=8)
+assert len(train_100_per_class) == 100 * 20
+```
+
+Iterate over every downstream budget and repeat in the benchmark protocol:
+
+```python
+protocol = subsets.to_pandas()
+
+for (n_per_class, subset_id), rows in protocol.groupby(
+    ["n_per_class", "subset_id"],
+    sort=True,
+):
+    train_subset = train.select(rows["train_row_idx"].tolist())
+    # Fit and evaluate one downstream classifier for this budget/repeat.
+```
+
+Load helper tables:
+
+```python
+class_map = load_dataset(repo, "class_map", split="train")
+normalization = load_dataset(repo, "normalization", split="train")
+metadata = load_dataset(repo, "metadata", split="train")
+```
+
+Load optional parcel geometries with streaming:
+
+```python
+geolocation = load_dataset(
+    repo,
+    "geolocation",
+    split="train",
+    streaming=True,
+)
+geometry_row = next(iter(geolocation))
+print(geometry_row["parcel_id"])
+print(len(geometry_row["geometry"]))  # WKB bytes
 ```
 
 ## Dataset Creation
 
-### Source Data
+Source data:
+
+- imagery: Sentinel-2 L2A observations prepared through Google Earth Engine;
+- labels and parcel boundaries: the IGN 2022 Registre Parcellaire Graphique (RPG);
+- geographic scope: metropolitan France, with a separate Centre-Val de Loire
+  geographic robustness test.
+
+Processing:
 
-🚧 Work in Progress 🚧
+- clouds, shadows, and missing observations are removed;
+- missing time steps are filled by linear interpolation resulting in every parcel being aligned and exactly 60 dates;
 
-- Features: Sentinel-2 L2A satellite imagery extracted using GEE
-- Labels: Crop type classification from the 2022French Registre Parcellaire Graphique (RPG)
+## Intended uses
 
-### Preprocessing
+This release is intended for:
 
-🚧 Work in Progress 🚧
+- low-label crop classification;
+- evaluation of frozen or pretrained time-series encoders;
+- reproducible comparisons using shared splits and subset selections.
 
-- Remove clouds, shadows, and missing data time steps
-- Temporal alignment
-- Temporal interpolation when missing
+## Limitations
+
+- The data cover one growing season, 2022.
+- Labels originate from administrative declarations and may contain source errors.
+- The benchmark contains 20 selected crop codes and is not exhaustive.
+- Temporal interpolation to fill missing/cloudy observations alters the original observation process.
+- `parcel_id` values are linkable to public RPG records and should be treated as a potential source of label leakage for the `pretraining` set.
 
 ## License
 
-Creative Commons Attribution-ShareAlike 4.0 International (CC-BY-SA-4.0)
+The dataset is released under
+[Creative Commons Attribution 4.0 International](https://creativecommons.org/licenses/by/4.0/).
+The full license text is included in [`LICENSE`](LICENSE).
+
+Please attribute this derived benchmark and its upstream data sources when reusing it:
+
+- FranceCrops Benchmark, Antoine Saget, CC BY 4.0.
+- [Copernicus Sentinel-2 L2A data](https://dataspace.copernicus.eu/data-collections/copernicus-sentinel-missions/sentinel-2),
+  prepared through Google Earth Engine. Sentinel data are made available on a free,
+  full, and open basis under the Copernicus Sentinel Data Legal Notice referenced by
+  the [Copernicus Data Space terms](https://dataspace.copernicus.eu/terms-and-conditions).
+- [IGN Registre Parcellaire Graphique (RPG)](https://www.data.gouv.fr/datasets/rpg),
+  2022 edition, used for parcel boundaries and crop codes and distributed under
+  the Licence Ouverte / Open Licence 2.0.
+
+This derived dataset is not endorsed by the European Commission, ESA, Google, or
+IGN.
+
+## Citation
+
+Please cite the FranceCrops work:
+
+```bibtex
+@inproceedings{saget2024francecrops,
+  title     = {Learning from Few Labeled Time Series with Segment-Based Self-Supervised Learning: Application to Remote-Sensing},
+  author    = {Saget, Antoine and Lafabregue, Baptiste and Cornu{\'e}jols, Antoine and Gan{\c{c}}arski, Pierre},
+  booktitle = {Proceedings of SPAICE2024: The First Joint European Space Agency/IAA Conference on AI in and for Space},
+  pages     = {275--279},
+  year      = {2024}
+}
+```

data/benchmark/test_centre_val_de_loire.parquet

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data/benchmark/test_france.parquet

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data/geolocation/README.md

@@ -0,0 +1,66 @@
+# Geolocation Table
+
+The `geolocation` config is an optional parcel-footprint join table.
+
+File:
+
+```text
+data/geolocation/geolocation.parquet
+```
+
+Size and shape:
+
+| Rows | Size | Format |
+| ---: | ---: | --- |
+| 138,610 | 54.5 MiB | GeoParquet-compatible Parquet |
+
+Columns:
+
+| Column | Type | Description |
+| --- | --- | --- |
+| `parcel_id` | string | RPG parcel identifier. Join key to `metadata.parquet` and benchmark rows. |
+| `surf_parc` | float64 | Parcel area from the RPG source table. |
+| `geometry` | binary | Parcel footprint encoded as WKB. |
+
+Coverage:
+
+- `geolocation.parquet` covers the same parcels as `metadata.parquet`.
+- Every row in this table has a matching `parcel_id` in `metadata.parquet`.
+- Join to benchmark rows by `parcel_id`.
+
+Geometry metadata:
+
+- WKB encoding.
+- CRS: WGS 84 / EPSG:4326.
+- Axis order: longitude, latitude.
+- The table intentionally does not include crop labels. Join to labels through
+  `parcel_id` only when maps, spatial joins, or footprint analysis are needed.
+
+Streaming example:
+
+```python
+from datasets import load_dataset
+
+geolocation = load_dataset(
+    "saget-antoine/francecrops",
+    "geolocation",
+    split="train",
+    streaming=True,
+)
+
+row = next(iter(geolocation))
+print(row["parcel_id"])
+print(len(row["geometry"]))  # WKB bytes
+```
+
+GeoPandas example:
+
+```python
+import geopandas as gpd
+import pandas as pd
+from shapely import wkb
+
+frame = pd.read_parquet("data/geolocation/geolocation.parquet")
+frame["geometry"] = frame["geometry"].map(wkb.loads)
+geo = gpd.GeoDataFrame(frame, geometry="geometry", crs="EPSG:4326")
+```

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train/dataset_info.json

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-{
-  "builder_name": "",
-  "citation": "",
-  "config_name": "",
-  "dataset_name": "francecrops",
-  "dataset_size": 3368120000,
-  "description": "Francecrops train dataset with 20 classes and 1000 samples per class",
-  "download_checksums": {},
-  "download_size": 0,
-  "features": {
-    "x": {
-      "shape": [
-        100,
-        60,
-        12
-      ],
-      "dtype": "float16",
-      "_type": "Array3D"
-    },
-    "y": {
-      "dtype": "int16",
-      "_type": "Value"
-    }
-  },
-  "homepage": "",
-  "license": "CC-BY-SA-4.0",
-  "size_in_bytes": 3368120000,
-  "splits": {
-    "train": {
-      "name": "train",
-      "num_bytes": 3368120000,
-      "num_examples": 20000,
-      "shard_lengths": [
-        5000,
-        5000,
-        5000,
-        5000
-      ],
-      "dataset_name": "francecrops"
-    }
-  },
-  "version": {
-    "version_str": "0.0.1",
-    "major": 0,
-    "minor": 0,
-    "patch": 1
-  }
-}

train/state.json

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-{
-  "_data_files": [
-    {
-      "filename": "data-00000-of-00004.arrow"
-    },
-    {
-      "filename": "data-00001-of-00004.arrow"
-    },
-    {
-      "filename": "data-00002-of-00004.arrow"
-    },
-    {
-      "filename": "data-00003-of-00004.arrow"
-    }
-  ],
-  "_fingerprint": "f81e340b36ebafff",
-  "_format_columns": null,
-  "_format_kwargs": {},
-  "_format_type": null,
-  "_output_all_columns": false,
-  "_split": "train"
-}