Data dictionary
Schema overview for Banlys MFD release packages. Channel meanings, quality flags, and instrument metadata.
Sensor channels
Values are device-dependent. Use for relative change and correlation; absolute units vary by hardware.
| Channel | Meaning | Notes |
|---|---|---|
emf / magnet |
Magnetometer / EMF proxy | Same sensor in current app |
accel / motion |
Accelerometer | Activity / attitude context |
gyro |
Gyroscope | Joint-event channel |
light |
Ambient light | When available |
pressure |
Barometer | Sparse on some devices |
entropy |
Shannon / composite summaries | When calibrated; filter zeros |
Quality & instrument fields
| Field | Role |
|---|---|
calibrated |
Batch includes entropy after baseline calibration |
research_quality |
gold vs standard (calibrated, enough readings, not degenerate) |
entropy_degenerate |
Flat Shannon windows / composite floor — not gold-worthy |
device_family |
Coarse manufacturer + model token |
charging / activity_state |
Confound tags for careful analysis |
sample_interval_ms |
Nominal 30000 on current mobile clients |
| Location | Rounded ~100 m — no precise addresses |
Careful packages prefer higher-quality device tiers with gold and non-degenerate filters applied.