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docs/coral-masks/LICENSE

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+coral-masks: per-row licences (see README.md). Mixed licences; each row carries its own `licence` and `attribution`.
+
+coralscapes: Apache-2.0
+reef-support-benthic-own: CC-BY-4.0
+reef-support-seaview-labels: CC-BY-3.0-AU (images); CC-BY-4.0 (masks, Reef Support)

docs/coral-masks/NOTICE

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+Attribution
+
+coralscapes: Coralscapes (Apache-2.0)
+reef-support-benthic-own: Reef Support (own imagery and annotations)
+reef-support-seaview-labels: Images: González-Rivero et al., XL Catlin Seaview Survey, UQ eSpace UQ_734799 (CC-BY-3.0-AU). Masks: Reef Support annotations (CC-BY-4.0).

docs/coral-masks/README.md

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+---
+pretty_name: ReefSupport marine-data hackathon v1 / coral-masks
+license: other
+configs:
+- config_name: coral-masks
+  data_files:
+  - split: train
+    path: data/coral-masks/train-*.parquet
+  - split: validation
+    path: data/coral-masks/validation-*.parquet
+  - split: test
+    path: data/coral-masks/test-*.parquet
+---
+# marine-data-hackathon v1 / coral-masks
+
+Coral reef benthic semantic segmentation: image + uint8 index mask (255 = ignore) + class_map, one row per image.
+
+Hackathon release v1 (2026-10-06 build). Splits: upstream where the source has them, else a deterministic 80/10/10 hash of split_group (no near-duplicate pass was run for this release).
+Mask encoding: semantic masks are uint8 index PNGs, 255 = ignore; instance masks are uint16 id PNGs, 0 = background. Every row repeats its licence and attribution.
+
+## Columns
+image_sha256, image, mask, class_map, source, licence, annotation_licence, attribution, split, split_group, annotator_type, width, height, lat, lon
+
+## Sources and licences
+| source | rows | splits | licence | attribution |
+|---|---|---|---|---|
+| coralscapes | 2075 (expected 2075) | test 392, train 1517, validation 166 | Apache-2.0 | Coralscapes (Apache-2.0) |
+| reef-support-benthic-own | 1226 (expected 1250) | test 167, train 930, validation 129 | CC-BY-4.0 | Reef Support (own imagery and annotations) |
+| reef-support-seaview-labels | 2696 (expected 2707) | test 284, train 2138, validation 274 | CC-BY-3.0-AU (images); CC-BY-4.0 (masks, Reef Support) | Images: González-Rivero et al., XL Catlin Seaview Survey, UQ eSpace UQ_734799 (CC-BY-3.0-AU). Masks: Reef Support annotations (CC-BY-4.0). |
+
+## Provenance notes
+- reef-support-seaview-labels: images come from the XL Catlin Seaview Survey (CC-BY-3.0-AU, attribution above); the masks are Reef Support annotations (CC-BY-4.0). Masks were decoded from the stitched RGB Labelbox renders with the fixed 5-colour palette (Hard Coral = 1, Soft Coral = 2, 0 = unlabelled/ignore).
+- reef-support-benthic-own: Reef Support own imagery and annotations (CC-BY-4.0), source version 2026-09-24. split_group for seaview rows = site partition + first 5 characters of the image id (provisional).
+
+## Load
+```python
+from datasets import load_dataset
+ds = load_dataset('parquet', data_files={'train': 'data/coral-masks/train-*.parquet', 'validation': 'data/coral-masks/validation-*.parquet', 'test': 'data/coral-masks/test-*.parquet'})
+```
+
+Files in this prefix: README.md, LICENSE, NOTICE, data/, CHECKSUMS.sha256 (written last; sha256 of every file).