| --- |
| pretty_name: "Optical profilometry of opened Herculaneum papyri" |
| license: cc-by-nc-4.0 |
| task_categories: [image-segmentation] |
| size_categories: [n<1K] |
| tags: [image, 3d, archaeology] |
| --- |
| |
| # Optical profilometry of opened Herculaneum papyri |
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| Dataset accompanying [“Ink detection from surface topography of the Herculaneum papyri”](https://doi.org/10.1038/s41598-026-58467-1). |
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| The release contains 14 co-registered profilometry regions encompassing 16 letters from PHerc. 248, PHerc. 250, and PHerc. 500P2. |
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| - Native lateral sampling: 0.68793625 µm/pixel in X and Y |
| - Vertical sensitivity: 8 nm |
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| > **NOTICE — 3 September 2026:** We identified an inconsistency between the lateral sampling recorded in this dataset’s metadata and the value reported in the manuscript. We are investigating the discrepancy and will apply any necessary corrections. |
|
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| ## Data |
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| Each sample under `data/` has four files with identical dimensions and a top-left origin: |
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| - `<sample>.txt`: semicolon-delimited X, Y, and calibrated Z values in µm; missing reconstructions are `nan` |
| - `<sample>_z.tif`: per-sample normalized uint16 height map |
| - `<sample>_stack.tif`: co-registered RGB brightfield image |
| - `<sample>_label.png`: grayscale ink annotation; experiment preprocessing treats nonzero values as foreground |
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| Use the text files when calibrated physical heights are required. Exact height-map preprocessing is specified in `configs/experiment.json`. |
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| ## Metadata and configurations |
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| - `manifest.csv`: dimensions, physical extents, sampling, acquisition dates, and file paths |
| - `configs/case_manifest.json`: stable machine-learning case IDs and sample mapping |
| - `configs/sampling.json`: native, vertical, and factor-derived sampling values |
| - `configs/experiment.json`: preprocessing, experiments, training settings, and software versions |
| - `configs/nnunet/`: dataset descriptor and nine resolution-specific nnU-Net plans |
| - `folds/splits_final.json`: five cross-validation and three leave-one-papyrus-out splits |
|
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| ## License |
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| Data, annotations, folds, and configurations are CC BY-NC 4.0. See `LICENSE`. Please cite the associated paper above. |
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|
