1 | | == Mirror torsion error correction == |

2 | | |

3 | | This shouldn't need to be done with newer LIDARs, but included here in case. Leica suggests checking for torsion errors if there seem to be problems in the boresight calibration and reporting to them if found. |

4 | | |

5 | | Visible sign of torsion error is a smile effect. |

6 | | |

7 | | Detect torsion by: |

8 | | * choose highest altitude pair of crossing lines |

9 | | * pick a point at nadir on one swath and at the edge on the other |

10 | | * torsion will be at max for the edge swath and at 0 for the nadir swath |

11 | | * take cross sections to see if there is any consistent vertical difference |

| 1 | |

| 354 | |

| 355 | === Mirror torsion error correction === |

| 356 | |

| 357 | This shouldn't need to be done with newer LIDARs, but included here in case. Leica suggests checking for torsion errors if there seem to be problems in the boresight calibration and reporting to them if found. |

| 358 | |

| 359 | Visible sign of torsion error is a smile effect. |

| 360 | |

| 361 | Detect torsion by: |

| 362 | * choose highest altitude pair of crossing lines |

| 363 | * pick a point at nadir on one swath and at the edge on the other |

| 364 | * torsion will be at max for the edge swath and at 0 for the nadir swath |

| 365 | * take cross sections to see if there is any consistent vertical difference |