Update README.md

README.md

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     path: data/test_min3-*
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-Taken from the kaggle repository [here](https://www.kaggle.com/datasets/yash92328/ai4mars-terrainaware-autonomous-driving-on-mars).
+Taken from the kaggle repository [here](https://www.kaggle.com/datasets/yash92328/ai4mars-terrainaware-autonomous-driving-on-mars).
+
+# AI4Mars Dataset
+
+A dataset for terrain classification on Mars, specifically focused on Curiosity (MSL) rover data.
+
+## Dataset Structure
+
+The dataset contains high-resolution Mars surface images with corresponding semantic segmentation masks for terrain classification.
+
+### Features
+- **image**: Original EDR (Engineering Data Record) images from Mars
+- **label_mask**: Semantic segmentation masks with terrain labels
+- **rover_mask**: Binary masks (1 = rover visible)
+- **range_mask**: Binary distance masks (1 = beyond 30m)
+- **has_masks**: Boolean indicating presence of rover and range masks
+- **has_labels**: Boolean indicating presence of segmentation labels
+
+### Labels
+Terrain classes are encoded as RGB values in the segmentation masks:
+- `(0,0,0)`: Soil
+- `(1,1,1)`: Bedrock
+- `(2,2,2)`: Sand
+- `(3,3,3)`: Big rock
+- `(255,255,255)`: No label/null
+
+### Data Splits
+- **Train**: Crowdsourced labels with:
+  - Minimum 3 labeler agreement
+  - 2/3 agreement threshold per pixel
+  - 30m distance cutoff
+  - Rover regions masked out
+- **Test**: Expert-validated labels with:
+  - 100% agreement requirement
+  - Three versions available based on labeler agreement thresholds
+
+### Image Products
+All image products share matching base names with different extensions:
+1. **EDR Images** (.JPG): Raw Mars surface images
+2. **MXY Files** (.png): Rover mask products
+3. **RNG Files** (.png): 30-meter range mask products
+
+## Notes
+- Current version (0.1) only includes Curiosity (MSL) data
+- MER (Mars Exploration Rover) data processing is work in progress
+- Range masks are derived from PDS (Planetary Data System) products