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golamrob/bakkhali-river-high-low-tide

Bakkhali River — High Tide vs Low Tide, Bangladesh 517 photographs of the Bakkhali River near Cox's Bazar, Bangladesh, documenting the same general stretch of river at high tide (264 images) and low tide (253 images). Captured across 10 separate sessions between 2 July and 15 August 2026. This is not a frame-by-frame matched pair set — sessions were shot on different dates and the camera position varies within each session — but high- and low-tide frames come from the same short… See the full description on the dataset page: https://huggingface.co/datasets/golamrob/bakkhali-river-high-low-tide.

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Bakkhali River — High Tide vs Low Tide, Bangladesh

517 photographs of the Bakkhali River near Cox's Bazar, Bangladesh, documenting the same general stretch of river at high tide (264 images) and low tide (253 images). Captured across 10 separate sessions between 2 July and 15 August 2026.

This is not a frame-by-frame matched pair set — sessions were shot on different dates and the camera position varies within each session — but high- and low-tide frames come from the same short stretch of riverbank (GPS coordinates for both groups fall in the same ~600m range), so the collection is useful for comparing how the waterline, exposed mudflats, and mangrove edge shift between tide states.

Contents

  • —517 JPG images, 2000×1333 px:
  • —bakkhali-river-during-high-tide-001.JPG through -264.JPG
  • —bakkhali-river-during-low-tide-001.JPG through -253.JPG
  • —metadata.jsonl — one record per image with capture time, tide state, camera settings, GPS (where available), and location fields

Capture methodology

Shot handheld with a Nikon D7200, using either a 50mm f/1.8 or an 18-140mm f/3.5-5.6 lens depending on the session. Aperture, ISO, and shutter speed vary by date and lighting condition — this is a multi-session field collection, not a single controlled shoot.

Location and GPS

GPS is present for 451 of 517 images (fuzz-free, as captured). It is missing for 66 images: 36 from a 13 July evening session and 28 from a 22 July session where the phone GNSS failed to lock, plus 2 isolated dropouts. Where present, coordinates place both tide groups within the same short stretch of the Bakkhali River, Cox's Bazar.

Known limitations

  • —In-camera processing is not consistent across sessions. Picture Control profile varies (Flat, Neutral, Standard), along with White Balance (mostly Sunny, some Auto) and Active D-Lighting (mostly Off, some Normal/Auto). Each image's values are included in metadata.jsonl so affected frames can be filtered.
  • —Not a single controlled shoot — 10 sessions across 6 weeks, with day-to-day variation in light and exposure settings.
  • —GPS missing for 66 of 517 images (see above).
  • —"High tide" and "low tide" groups are not exact frame-matched pairs; they share the same general location and river stretch, shot on different dates.

License

CC BY 4.0. Free to use, share, and adapt for any purpose, including commercially, provided appropriate credit is given to Golam Rob (golamrob.com).

Citation

![DOI](https://doi.org/10.5281/zenodo.22217758)

Golam Rob (2026). Bakkhali River — High Tide vs Low Tide, Bangladesh.
Ground-truth environmental image dataset. golamrob.com. CC BY 4.0.

More datasets

Catalog of ground-truth environmental datasets from coastal Bangladesh: https://golamrob.com