| --- |
| license: other |
| license_name: research-use-cite-source |
| license_link: https://github.com/ChangeCapsInRS/MOSAIC-SEN2-CC |
| task_categories: |
| - image-text-to-text |
| tags: |
| - earth-observation |
| - change-detection |
| - sentinel-2 |
| - remote-sensing |
| language: |
| - en |
| size_categories: |
| - 10K<n<100K |
| --- |
| |
| # danvinci/mosaic_sen2_cc_change_detection |
|
|
| Multi-image change-detection reformat of the |
| [MOSAIC-SEN2-CC dataset](https://github.com/ChangeCapsInRS/MOSAIC-SEN2-CC) |
| (Tuzlupinar et al., IEEE JSTARS 2025), prepared for vision-language |
| fine-tuning of `LiquidAI/LFM2.5-VL-1.6B`. |
|
|
| ## Splits |
|
|
| | split | rows | source | |
| |--------------|--------------|--------------------------------| |
| | `train` | 29281 | full MOSAIC TRAIN partition | |
| | `validation` | 700 | balanced 33% positive sample | |
|
|
| ## Schema |
|
|
| Each row is a (before_img, after_img, prompt, answer, schema_id) tuple: |
| |
| | field | type | description | |
| |--------------|-------------|----------------------------------------------| |
| | `before_img` | PIL Image | Sentinel-2 RGB tile before the change window | |
| | `after_img` | PIL Image | Sentinel-2 RGB tile after the change window | |
| | `prompt` | string | Per-schema predicate prompt | |
| | `answer` | string | JSON-shaped object **or** literal `"null"` | |
| | `schema_id` | string | One of 7 change-event schemas (see below) | |
|
|
| ## Change-event schemas (7) |
|
|
| Each schema lives at `schemas/<schema_id>.json` and defines the positive-event |
| field spec. Predicate prompts in the dataset reference these contracts. |
|
|
| - `ConstructionProgress` — building / road footprint expansion |
| - `FloodExtentChange` — water surface expansion (excludes stable water) |
| - `IceExtentChange` — sea / lake / glacier ice retreat or growth |
| - `ThermalHotspot` — wildfire / volcanic / industrial heat anomaly |
| - `UrbanChangeDelta` — generic urban land-cover delta |
| - `VegetationStress` — drought / disease / clear-cut signal |
| - `WetlandChange` — wetland surface delta |
|
|
| ## Usage |
|
|
| ```python |
| from datasets import load_dataset |
| ds = load_dataset("danvinci/mosaic_sen2_cc_change_detection") |
| print(ds) |
| # DatasetDict({ |
| # train: Dataset(...29281 rows), |
| # validation: Dataset(...700 rows), |
| # }) |
| |
| row = ds["train"][0] |
| row["before_img"] # PIL.Image (RGB Sentinel-2 tile) |
| row["after_img"] # PIL.Image |
| row["prompt"] # "Did urban-change-delta occur..." |
| row["answer"] # JSON object or "null" |
| row["schema_id"] # "UrbanChangeDelta" |
| ``` |
|
|
| ## Auxiliary files at repo root |
|
|
| - `schemas/<schema_id>.json` — 7 field-spec contracts |
| - `mosaic_reformat_v0.jsonl` — original row-metadata (before/after tile paths, |
| split assignment, expected_output) used to build the prepared Arrow |
| |
| ## Provenance + license notes |
| |
| This is a **derivative reformat** of the |
| [MOSAIC-SEN2-CC dataset](https://github.com/ChangeCapsInRS/MOSAIC-SEN2-CC), |
| not the canonical release. The reformat collapses MOSAIC's change-detection |
| annotations into a uniform image-text-to-text supervised contract suitable |
| for VLM fine-tuning, but the underlying tile pairs and labels originate from |
| the upstream MOSAIC project. |
| |
| License posture (the upstream repo does **not** ship an explicit LICENSE |
| file — typical academic-dataset gray zone): |
| |
| - **Sentinel-2 imagery** is redistributable: ESA Copernicus Sentinel data is |
| released under the Copernicus "free, full and open access" license. |
| - **MOSAIC change-detection annotations**: research/academic use under |
| citation is the established norm; non-research / commercial redistribution |
| may require explicit permission from the original authors. Contact the |
| upstream maintainers via the GitHub repo for any non-research use. |
| - **The reformat itself** (this repo's prompt structure, schema definitions, |
| Arrow layout) is shared under the same research-use-cite-source posture |
| as the upstream MOSAIC. |
| |
| Built during the DPhi Space x Liquid AI hackathon (May 2026) as part of the |
| [liquid_space](https://github.com/danvinci/liquid_space) project. |
| |
| ## Citation |
| |
| Always cite the upstream MOSAIC-SEN2-CC paper when using this reformat: |
| |
| ```bibtex |
| @ARTICLE{karaca2025robust, |
| author={Busra Tuzlupinar and Enes Ozelbas and Mehmet Fatih Amasyali and Ali Can Karaca}, |
| journal={IEEE Journal of Selected Topics in Applied Earth Observations and Remote Sensing}, |
| title={Introducing MOSAIC-SEN2-CC: A Multispectral Dataset and Adaptation Framework for Remote Sensing Change Captioning}, |
| year={2025}, |
| volume={18}, |
| pages={25410-25426}, |
| doi={10.1109/JSTARS.2025.3615113} |
| } |
| ``` |
| |
