| --- |
| license: mit |
| tags: |
| - electron-microscopy |
| - 4D-STEM |
| - materials-science |
| - quantem |
| pretty_name: quantem-data |
| --- |
| |
| # quantem-data |
|
|
| Reference electron-microscopy datasets (gold 4D-STEM and HAADF) for browsing |
| and learning with [quantem.widget](https://github.com/bobleesj/quantem.widget). |
| This repo just hosts the data — all instructions live in one place: |
|
|
| **How to download and use this data:** follow the |
| [Download data tutorial](https://bobleesj.github.io/quantem.widget/tutorials/download_data.html) |
| in the quantem.widget docs. One call per dataset: |
|
|
| ```python |
| from quantem.widget import Show4DSTEM |
| from quantem.widget.datasets import show4dstem_gold |
| |
| Show4DSTEM(show4dstem_gold()) |
| ``` |
|
|
| Layout — two trees: |
|
|
| - **`widget-tutorials/<widget>/<dataset>/<size>/`** — baseline tutorial |
| bundles for the core widgets (`show1d/`, `show4dstem/`, `showfolder/`; |
| data shared by Show2D and Show3D lives under `shared/`). These back the |
| one-call loaders in `quantem.widget.datasets` and the Colab workshops. |
| Baseline tutorials only — real work uses your own data. |
| - **`4dstem/`, `haadf/`** — full-size originals (Arina h5, Velox EMD) for |
| power users. |
|
|
| Every NumPy bundle ships a `meta.json` (shape, dtype, sampling, units, |
| optics) next to `data.npy`. |
|
|
| Workshop notebooks (Google Colab, no local install): |
| [Show4DSTEM demo](https://colab.research.google.com/gist/bobleesj/54864ce5b2a6f0a4fd5ae1e5d5719b45/show4dstem_colab.ipynb) |
| · |
| [Workshop v1](https://colab.research.google.com/gist/bobleesj/a05a90185c6cddbb331342cae6d7e9c1/berk_workshop_v1.ipynb) |
|
|
| ## Acquisition parameters |
|
|
| The 20260423 drift session's optics are **confirmed via the session's own |
| HAADF EMD** (`AccelerationVoltage`, `BeamConvergence`, `CameraLength`). |
| 4D-STEM `scan_sampling` is an **operator pattern from a sibling SSB session** |
| — the drift acquisition itself was never per-file calibrated. |
|
|
| | dataset | voltage | probe | CL | scan | scan sampling | det pitch | mag | |
| |---|---|---|---|---|---|---|---| |
| | `haadf/gold_haadf_npy` | 300 kV ✓ | 30 mrad ✓ | 91 mm ✓ | 4096² image | 0.0186 nm/px | n/a | FOV 76.2 nm | |
| | `4dstem/gold_512_npy_bin8` | 300 kV ✓ | 30 mrad ✓ | 91 mm ✓ | 512² | 0.5 Å (op) | 3.68 mrad/px | unknown | |
| | `4dstem/gold_512_npy_bin4` | 300 kV ✓ | 30 mrad ✓ | 91 mm ✓ | 512² | 0.5 Å (op) | 1.84 mrad/px | unknown | |
| | `4dstem/gold_512` | 300 kV ✓ | 30 mrad ✓ | 91 mm ✓ | 512² | 0.5 Å (op) | 0.46 mrad/px | unknown | |
| | `4dstem/gold_30mrad1.3mx04`…`09` | 300 kV | 30 mrad | 91 mm | smaller | (session yaml) | 0.46 mrad/px | 1.3 Mx | |
| | `haadf/gold_haadf.emd` | 300 kV ✓ | 30 mrad ✓ | 91 mm ✓ | 4096² image | 0.0186 nm/px | n/a | FOV 76.2 nm | |
|
|
| ✓ = confirmed via EMD/yaml. `(op)` = operator pattern, not file-certified. |
|
|
| ## License |
|
|
| MIT — free to use for anything. Citing |
| [quantem.widget](https://github.com/bobleesj/quantem.widget) in publications |
| is appreciated. |
|
|
