| # instance-masks |
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| Reef Support Marine Data v1.0 (October 2026). Part of [reefsupport/marine-data](https://huggingface.co/datasets/reefsupport/marine-data). |
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| Underwater instance segmentation: `image`, a `uint16` instance-id `mask` (`0` = background) and `instances`, a list with the label and a normalised box for every instance id. |
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| Splits are the upstream splits where the source provides them, otherwise a deterministic 80/10/10 hash of `split_group`. No near-duplicate check was run on this configuration. |
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| Mask encoding: semantic masks are `uint8` index PNGs (`255` = ignore); instance masks are `uint16` instance-id PNGs (`0` = background). Every row repeats its licence and attribution. |
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| ## Columns |
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| image_sha256, image, mask, instances, source, licence, annotation_licence, attribution, split, split_group, annotator_type, width, height, lat, lon |
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| ## Sources and licences |
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| | source | rows | splits | licence | |
| |---|---|---|---| |
| | uiis | 4,622 (source: 4,628) | train 3,932, validation 690 | Apache-2.0 | |
| | uiis10k | 10,042 (source: 10,048) | test 2,007, train 8,035 | Apache-2.0 | |
| | usis10k | 10,632 (source: 10,632) | test 1,596, train 7,442, validation 1,594 | Apache-2.0 | |
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| Licence texts are in `LICENSE`, copyright holders and attribution lines in `NOTICE`. |
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| ## Image provenance |
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| Images in this configuration originate from UIIS, UIIS10K and USIS10K, distributed by their authors under the Apache License 2.0. The original publications state that the images were gathered from public sources and earlier datasets, so copyright in individual images may rest with third parties. Rights holders can request removal via https://github.com/reefsupport/marine-data/issues or https://www.reef.support/contact. |
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| ## Notes |
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| - Rows dropped: 6 of 4,628 `uiis` and 6 of 10,048 `uiis10k`. |
| - These images are also used in `fish-boxes`. Join on `image_sha256` before evaluating across configurations. |
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| Changes made by Reef Support: images and masks were re-encoded into Parquet, `class_map` or `instances` were added, and splits and `split_group` were assigned. |
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| ## Load |
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| ```python |
| from datasets import load_dataset |
| ds = load_dataset("reefsupport/marine-data", "instance-masks") |
| ``` |
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| ## Files |
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| `README.md`, `LICENSE`, `NOTICE` and `CHECKSUMS.sha256` (sha256 of every file of the configuration). To verify the data files: `grep ' data/' CHECKSUMS.sha256 | sha256sum -c -` from a directory that contains `data/`. |
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