README.md

---
license: mit
---

# Mandeye Mapping – Loop Closure dataset

Handheld LiDAR + IMU + camera dataset recorded with a [Mandeye](https://github.com/JanuszBedkowski/mandeye_controller) scanner in an urban courtyard, with a loop in the trajectory. It comes with LiDAR-inertial odometry results from [HDMapping](https://github.com/MapsHD/HDMapping) (v0.104.0) and a LiDAR–camera calibration, so you can colorize the point cloud from the camera images.

![Colored point cloud and camera trajectory in HDMapping's Trajectory Viewer](screenshot002.png)

▶️ Video: [https://youtu.be/jxjWX8dq30Y](https://youtu.be/jxjWX8dq30Y)

## Contents

| Path | Description |
|------|-------------|
| `lidar*.laz`, `lidar*.sn` | Raw LiDAR chunks (point clouds + serial numbers) |
| `imu*.csv` | IMU data (gyro, accelerometer, timestamps) |
| `status*.json` | Scanner status snapshots |
| `CAMERA_0_blurred/` | Camera images (`cam0_<timestamp>.jpg`), faces/plates blurred |
| `extrinsics.json` | Camera intrinsics (`fx, fy, cx, cy`, distortion) and `T_lidar_to_camera_4x4` extrinsics |
| `lio_result_0/` | HDMapping LiDAR-inertial odometry output: `scan_lio_*.laz`, `trajectory_lio_*.csv`, `session.mjs`, params `.toml` |

## Usage

1. Download the dataset:
   ```bash
   git lfs install
   git clone https://huggingface.co/datasets/MichalPelka/MandeyeMappingLoopClosure
   ```
2. Get [HDMapping](https://github.com/MapsHD/HDMapping) ([releases](https://github.com/MapsHD/HDMapping/releases)).
3. (Optional) Re-run LiDAR odometry on the raw data with HDMapping's `lidar_odometry_step_1`, or use the provided `lio_result_0/`.
4. Open the **Trajectory Viewer** and in the side panel:
   - **Session** → *LIO result directory*: `./lio_result_0`, leave *CAMERA_0 directory* empty (auto-detects `CAMERA_0_blurred`) → **Load session** → **Load cloud**
   - **Calibration** → *Calibration JSON*: `extrinsics.json` → **Load calibration**
   - **Export** → **Export colored LAZ** / **Export colored E57**

## Links

- Video: https://youtu.be/jxjWX8dq30Y
- HDMapping: https://github.com/MapsHD/HDMapping
- Mandeye controller: https://github.com/JanuszBedkowski/mandeye_controller